A sediment remediation agent containing bamboo active ingredients and its preparation method

Abstract

The present invention relates to the technical field of environmental remediation, and particularly relates to a sediment remediation agent containing bamboo active ingredients and a preparation method thereof, which comprises the following components in parts by weight: 30-50 parts of an oxidant, 5-12 parts of an ecological adsorbent, 2-6 parts of a composite microorganism, and 20-30 parts of a supported zeolite composite particle. The sediment remediation agent in the present invention can stably exist in the sediment, and through the synergistic effect among the components, it can provide a good microenvironment for the microorganisms in the sediment. By slowly releasing a biological promoter, it can not only enhance the role of the microorganisms but also improve the utilization rate, accelerate the degradation rate of organic pollutants in the sediment, achieve the best remediation effect, and at the same time, continuously release the biological promoter, which also inhibits the accumulation of organic pollutants in the sediment, thereby preventing secondary pollution of the sediment and achieving a continuous and efficient sediment remediation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental remediation, and particularly to a sediment remediation agent containing bamboo active ingredients and a preparation method thereof. Background Art

[0002] As the main carrier of urban water resources, rivers undertake important functions closely related to human life, such as water supply, shipping, sewage treatment, and regulation of regional microclimate. However, with the acceleration of industrialization and the insufficient urban pollution treatment capacity, a large number of exogenous pollutants are discharged into the river, resulting in water quality deterioration and eutrophication. In some river sediments, seasonal or long-term black odor phenomena have occurred. The urban black and odorous sediment remediation project is to cut off exogenous pollution while reducing endogenous pollution and improving water quality. At present, the main remediation technologies for black and odorous sediments can be divided into physical remediation, chemical remediation, and microbial remediation according to the remediation principle. In actual projects, multiple remediation technologies are often used in combination to obtain better remediation effects.

[0003] For example, Chinese Patent CN110563292B discloses a river sediment remediation agent and its preparation and application methods. The components and masses of the river sediment remediation agent are: 30 - 50 parts of calcium nitrate, 20 - 40 parts of calcium carbonate loaded with iron oxide, 5 - 20 parts of bentonite, 1 - 5 parts of polyvinyl alcohol, 1 - 5 parts of surfactant, and 1 - 5 parts of adhesive. Although this remediation agent has a certain slow-release effect and improves the treatment efficiency, due to its poor stability in the river, even if it is deposited at the bottom of the river, it will migrate and be lost under the action of water flow, resulting in less dosage of the remediation agent acting on the severely polluted sediment and poor remediation effect. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a sediment remediation agent containing bamboo active ingredients and a preparation method thereof.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A sediment remediation agent containing bamboo active ingredients, comprising the following components in parts by weight: 30 - 50 parts of oxidant, 5 - 12 parts of ecological adsorbent, 2 - 6 parts of composite microorganism, and 20 - 30 parts of supported zeolite composite particles;

[0007] The preparation method of the supported zeolite composite particles is as follows:

[0008] S1 Add double-layer microcapsules to the synthesis raw materials of zeolite particles, and obtain macroporous zeolite particles with partial micron-sized pore diameters through high-temperature calcination;

[0009] S2 generates protruding nanosheets on the pore walls of the pores of the large-pore zeolite particles through a hydrothermal reaction assisted by ultrasound, and through a secondary hydrothermal reaction, a network film is generated to embed and cover the nanosheets, obtaining pretreated zeolite particles;

[0010] S3 After microencapsulating the biological promoter, it is infiltrated into the pretreated zeolite particles by vacuum impregnation and fully mixed with the nanofibers;

[0011] The biological promoter is composed of bamboo active substances, vitamins and minerals, pyrimidine, purine, and octenyl succinic anhydride starch ester in a mass ratio of (5-10):(25-30):(10-13):(10-13):(3-7);

[0012] The bamboo active substances are composed of amino acids, bamboo leaf flavonoids, polysaccharides, and bamboo vinegar in a mass ratio of 1:(0.2-0.5):(0.3-0.7):(0.1-0.3).

[0013] As a further preferred embodiment of the present invention, the oxidant is prepared from the following materials in the following weight ratios: 60-80 parts of calcium peroxide, 20-27 parts of activated carbon with a particle size of 30-50 mesh, and 1-2 parts of phosphate;

[0014] The ecological adsorbent is composed of the following raw materials in the following weight ratios: 10-20 parts of zeolite, 5-8 parts of gravel, and 2-5 parts of ceramsite;

[0015] The composite microorganism is composed of the following raw materials in the following weight ratios: 20-30 parts of EM bacteria, 15-25 parts of Bacillus subtilis, and 12-17 parts of Bacillus cereus.

[0016] As a further preferred embodiment of the present invention, in S1, the double-layer microcapsule uses eugenol as the core material and chitosan, whey protein, and sodium alginate as the wall material, and is prepared by the freeze-drying method;

[0017] The synthesis raw materials of the zeolite particles are a mixture composed of sodium hydroxide, cetyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol, and isopropanol in a molar ratio of (0.8-1.2):(5.0-7.5):(3.4-5.2):(1.0-1.5):(370-560):(19.6-30.0):(6.0-9.2);

[0018] The double-layer microcapsule accounts for 3-7% of the total mass of the synthesis raw materials of the zeolite particles;

[0019] The high-temperature calcination is carried out at a temperature of 500-520 °C for 4-6 h.

[0020] Furthermore, the specific preparation method of the double-layer microcapsule is as follows:

[0021] 1) Add 0.5-2.5g chitosan to 70-100mL acetic acid solution with a concentration of 1.0-1.5wt%, stir well to dissolve, and obtain chitosan solution; add 2-5g whey protein to 100-130mL deionized water, stir well, add 1.0-1.6g emulsifier Span 80, and then add 3-7g eugenol, stir well to obtain a mixed solution, and drop the mixed solution into the chitosan solution, mix well, and then drop 10-18mL of a cross-linking agent sodium sulfate aqueous solution with a concentration of 1.2-1.5wt% into the mixed solution at room temperature and 150-200W ultrasonic action, ultrasonically treat for 10-20min, remove the upper liquid by centrifugation, wash the lower precipitate, and obtain microcapsules;

[0022] 2) Add 1-3 g of microcapsules to 60-90 mL of 1-2 wt% sodium alginate solution, stir for 10-30 min after mixing, and then centrifuge at 3000-4000 r / min for 5-10 min to obtain microcapsules with sodium alginate attached to the surface. Add the microcapsules with sodium alginate attached to the surface to 50-70 mL of 2-3 wt% calcium chloride aqueous solution, and centrifuge at 3000-4000 r / min for 5-10 min to obtain solid precipitates. Wash 3-5 times with a 1% volume fraction emulsifier Span 80 solution to obtain crude microcapsules, and finally freeze-dry to obtain double-layer microcapsules.

[0023] Furthermore, the large-pore zeolite particles are specifically prepared by the following method:

[0024] 1) Sodium hydroxide, hexadecyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol and isopropanol are mixed in a molar ratio of (0.8-1.2): (5.0-7.5): (3.4-5.2): (1.0-1.5): (370-560): (19.6-30.0): (6.0-9.2) to obtain a mixture, and then double-layer microcapsules accounting for 3-7% of the total mass of the mixture are added, and after mixing, the mixture is placed in a sealed container for crystallization, and stirred at 800-1200 r / min for 3-5 hours at 98°C, and then centrifuged at a speed of 12000-15000 r / min for 60-80 minutes to obtain solid particles;

[0025] 2) Disperse the above solid particles in deionized water, centrifuge to remove the supernatant, repeat the operation until the pH of the supernatant drops below 9, then dry the solid particles at 65-70°C overnight, and then place them in a calcining furnace, in an air atmosphere, heat from room temperature to 500-520°C at a rate of 1-2°C / min, calcine for 4-6h, and naturally cool to room temperature.

[0026] As a further preferred embodiment of the present invention, in S2, the specific operations are as follows:

[0027] Using bismuth oxide, ferric chloride, ammonium chloride, and sodium hydroxide as raw materials for synthesizing nanosheets, after stirring and mixing with macroporous zeolite particles, under the action of ultrasound, a precursor is formed through hydrothermal reaction. Then, potassium antimonyl tartrate and thioacetamide are used as the antimony source and sulfur source respectively, and the precursor is used as the matrix material. Through hydrothermal reaction, a reticular thin film is formed on the nanosheets for embedding and covering to obtain pretreated zeolite particles;

[0028] For the hydrothermal reaction assisted by ultrasound, the ultrasound power is 300 - 500 W, the hydrothermal reaction temperature is 200 - 210 °C, and the reaction time is 10 - 15 h;

[0029] For the secondary hydrothermal reaction, the temperature is 180 - 190 °C, and the reaction time is 24 - 30 h;

[0030] The mass ratio of bismuth oxide, ferric chloride, ammonium chloride, sodium hydroxide, and macroporous zeolite particles is (0.6 - 1.0):(0.8 - 1.4):(2.6 - 4.5):(12 - 20):(8 - 12);

[0031] The mass ratio of potassium antimonyl tartrate, thioacetamide, and the precursor is (8.0 - 9.5):(1.8 - 2.1):(5 - 8).

[0032] Furthermore, for the pretreated zeolite particles, the preparation method is as follows:

[0033] 1) Dissolve 0.6 - 1.0 g of bismuth oxide in 4 - 8 mL of hydrochloric acid with a concentration of 37 wt%, add 46 - 78 mL of deionized water, then add 0.8 - 1.4 g of ferric chloride, stir well until dissolved, then add 2.6 - 4.5 g of ammonium chloride to the above solution. After dissolution, add 12 - 20 g of sodium hydroxide, mix well and then add 8 - 12 g of macroporous zeolite particles. Seal and stir at 800 - 1200 r / min for 20 - 30 min, then under the action of ultrasound with a power of 300 - 500 W, put the precursor into a hydrothermal autoclave and carry out hydrothermal reaction at 200 - 210 °C for 10 - 15 h. After the reaction is completed, cool to room temperature, centrifuge and dry the obtained product to form a precursor;

[0034] 2) Dissolve 8.0 - 9.5 g of potassium antimonyl tartrate in 30 - 35 mL of deionized water. After fully stirring and dissolving, add 0.20 - 0.24 g of polyvinylpyrrolidone, continue to stir and dissolve. Then add 1.8 - 2.1 g of thioacetamide to the mixed solution, fully stir and mix evenly to obtain a reaction solution. Then add 5 - 8 g of the precursor to the reaction solution, mechanically stir at 1000 - 1500 r / min for 1 - 2 h, transfer it to a reaction kettle, and carry out a constant temperature heating treatment at 180 - 190 °C for 24 - 30 h. After the reaction is completed, cool it to room temperature, and centrifuge and dry the obtained product.

[0035] As a further preferred embodiment of the present invention, in S3, the specific operation steps are as follows;

[0036] Adopt the single coacervation method, use chitosan and chitosan quaternary ammonium salt as the composite wall material, and add porous carbon nanosheets to the wall material, use the biological promoter as the core material. After microencapsulating the biological promoter, obtain the biological promoter microcapsule. Then, by means of vacuum impregnation, infiltrate the biological promoter microcapsule into the pores of the pretreated zeolite particles, and then add nanofibers and continue vacuum impregnation under mechanical stirring;

[0037] The nanofibers are selected as bamboo cellulose nanofibers, and the addition amount is 5 - 8% of the mass of the pretreated zeolite particles;

[0038] The specific preparation method of the biological promoter microcapsule is as follows:

[0039] 1) Add the porous carbon nanosheets to the chitosan solution to obtain a chitosan mixed solution. Then add the biological promoter, span 80, chitosan quaternary ammonium salt, and polyvinyl alcohol solution to the chitosan mixed solution together, and emulsify to obtain a core material emulsion;

[0040] 2) Place the core material emulsion in a container, adjust the pH value to 8 - 9 under stirring conditions, then cool it to below 10 °C with an ice - water bath, and add a mixture composed of glyoxal and deionized water dropwise. After the dropwise addition is completed, fully solidify under stirring for 3 - 5 h, filter, wash, and dry to obtain the biological promoter microcapsule;

[0041] The concentration of the chitosan solution is 1 - 3 wt%;

[0042] The concentration of the polyvinyl alcohol solution is 3 - 6 wt%;

[0043] The addition amount of the porous carbon nanosheets is 5 - 8% of the mass of the chitosan solution;

[0044] The ratio of the biological promoter, Span 80, quaternary ammonium salt of chitosan, polyvinyl alcohol solution, and chitosan mixed solution is (2 - 6) g : (0.1 - 0.5) g : (0.1 - 0.3) g : (0.5 - 1.2) mL : (70 - 90) mL;

[0045] The ratio of the core material emulsion, glyoxal, and deionized water is (80 - 100) mL : (0.01 - 0.05) g : (10 - 16) mL.

[0046] Furthermore, the operation steps of S3 are as follows:

[0047] 1) Put 0.2 - 0.5 g of nano-magnesium oxide into 100 - 180 mL of methanol solution, ultrasonically disperse it evenly, then add 1.2 - 1.8 g of zinc nitrate and continuously stir for 1 - 3 h. Weigh 1.4 - 2.1 g of 2-methylimidazole and uniformly disperse it in 300 - 400 mL of methanol solution. Then mix the above two solutions and stir and react at 500 - 800 r / min at room temperature for 24 - 30 h. Centrifuge, wash, and dry the product to obtain the template skeleton material;

[0048] 2) Crush and grind equal masses of coal tar pitch, potassium bicarbonate, and the template skeleton material evenly, fully mix them and place them in a tube furnace. Heat it to 300 - 320 °C at a rate of 5 - 7 °C / min, keep it at a constant temperature for 30 - 50 min, then heat it to 900 - 950 °C, keep it at a constant temperature for 1 - 2 h, and then naturally cool it to room temperature. Stir and soak the obtained product in 0.1 - 0.2 mol / L hydrochloric acid for 24 - 30 h, and after suction filtration, washing, and drying, grind and sieve it to obtain porous carbon nanosheets;

[0049] 3) Prepare a chitosan solution with a concentration of 1 - 3 wt% and a polyvinyl alcohol solution with a concentration of 3 - 6 wt% respectively. Then add porous carbon nanosheets according to 5 - 8% of the mass of the chitosan solution, fully mix and stir to obtain a chitosan mixed solution. Then add 2 - 6 g of biological promoter, 0.1 - 0.5 g of Span 80, 0.1 - 0.3 g of quaternary ammonium salt of chitosan, and 0.5 - 1.2 mL of polyvinyl alcohol solution into 70 - 90 mL of the chitosan mixed solution, and emulsify it at a rotation speed of 10000 - 15000 r / min to obtain the core material emulsion;

[0050] 4) Place 80 - 100 mL of the core material emulsion in a container. Under stirring conditions, adjust the pH value to 8 - 9 using a sodium hydroxide solution with a concentration of 10 - 12 wt% to precipitate and coagulate chitosan. Then cool it to below 10 °C in an ice - water bath. Add a mixture composed of 0.01 - 0.05 g of glyoxal and 10 - 16 mL of deionized water drop - by - drop. The dropping time is 30 - 40 min. After the dropping is completed, cure it fully for 3 - 5 h under stirring. After filtration, washing, and drying, obtain the biological promoter microcapsules;

[0051] 5) Add the pretreated zeolite particles to a vacuum tank. Evacuate to 80 - 150 Pa and maintain for 15 - 20 min. Disperse the biological promoter microcapsules in deionized water to obtain a dispersion with a solid content of 3 - 7 wt%. Then, according to a solid - liquid ratio of 1:(20 - 30) g / mL, add the dispersion to the vacuum tank. Evacuate to 50 - 70 Pa and maintain for 20 - 30 min. Then, add bamboo cellulose nanofibers according to 5 - 8% of the mass of the pretreated zeolite particles. Under stirring at 500 - 800 r / min, continue to maintain for 15 - 20 min. After the treatment is completed, slowly release the pressure to atmospheric pressure. Centrifuge the product and then dry it.

[0052] A preparation method of a sediment remediation agent containing bamboo active ingredients is as follows:

[0053] According to the number of parts by weight, inoculate the composite microorganism into the TSB medium. After culturing for 2 - 3 d, dilute it to obtain a bacterial solution of 10 7 -10 8 cfu / mL. Then add an oxidant, an ecological adsorbent, and a supported zeolite composite particle to the bacterial solution, mix and stir into a slurry. After adsorption for 1 - 2 d, air - dry it to obtain the sediment remediation agent.

[0054] Compared with the prior art, the beneficial effects of the present invention are:

[0055] In the present invention, sodium hydroxide, cetyltrimethylammonium bromide, silica, alumina, deionized water, ethanol, isopropanol, etc. are used as raw materials. Through hydrothermal method and high-temperature calcination, zeolite particles with a multi-porous structure are synthesized. And in order to form large pore-sized pores at the micron level inside the zeolite particles, eugenol is used as the core material, and chitosan, whey protein and sodium alginate are used as the wall materials. A double-layer microcapsule with a two-layer wrapping structure is prepared by freeze-drying method. Due to the wrapping effect of the double-layer wall materials of the double-layer capsule, the microcapsule has a better physical protection barrier, can better resist external forces, so that it can maintain the stability of the structure and not be damaged during the subsequent high-speed stirring process. Thus, the double-layer microcapsule can exist in the zeolite particles with a complete structure. Through high-temperature calcination, in an air atmosphere, the double-layer microcapsule undergoes thermal cracking and generates carbon dioxide and water vapor, which escape, thus leaving a large pore-sized pore structure in the zeolite particles, leaving sufficient space for the subsequent penetration of the biological promoter microcapsule into the zeolite particles; then, bismuth oxide, ferric chloride, ammonium chloride, and sodium hydroxide are used as raw materials for synthesizing nanosheets. After being stirred and mixed evenly with the large pore-sized zeolite particles, a hydrothermal reaction is carried out under ultrasonic action to generate a precursor. Through sufficient stirring, it is beneficial to promote the synthesis raw materials to enter the large pore-sized zeolite particles through the pores. Through the hydrothermal reaction, a large number of nanosheets are formed and attached to the pore walls of the large pore-sized zeolite particles. And under the action of ultrasonic waves, it can promote the intercalation and stacking of the nanosheets, thus forming a multi-layer structure on the pore walls. The attached multi-layer nanosheet structure can fill the irregular defects of the pore walls, reduce the roughness of the pore walls, and form a smooth pore wall structure, thereby reducing the frictional resistance suffered by the subsequent biological promoter microcapsule when infiltrating into the zeolite particles, improving the smoothness of the infiltration of the biological promoter microcapsule and avoiding the rupture of the structure caused by friction; and in order to improve the stability of the nanosheets attached to the pore walls, in the present invention, potassium antimonyl tartrate and thioacetamide are used as the antimony source and sulfur source respectively, and the precursor is used as the matrix material. During sufficient mechanical stirring, the sulfur source and antimony source penetrate into the pores of the precursor, and antimony sulfide particles are generated through hydrothermal reaction and embedded at the junctions of the intercalated and stacked nanosheets. As the hydrothermal reaction proceeds, the antimony sulfide nanoparticles significantly decrease and gradually form a honeycomb-like network structure, thus covering the nanosheet structure, greatly increasing the stability of the nanosheets on the pore walls. And because the formed network structure is honeycomb-like, it is a highly porous interconnected network with a uniform surface, so it will not cause frictional influence on the infiltration of the biological promoter microcapsule.

[0056] In order to achieve a sustained-release effect, thereby prolonging the repair time of the biological promoter on the sediment and enhancing the repair effect, in the present invention, the single coacervation method is adopted, with chitosan and quaternary ammonium salt of chitosan as the composite wall material, and porous carbon nanosheets are added to the wall material. Using the biological promoter as the core material, after microencapsulating the biological promoter, a biological promoter microcapsule is obtained. On the one hand, the porous nanosheets added to the wall material can form a nanosheet layer structure of a continuous phase through intercalation and stacking, improving the strength of the wall material, thereby enhancing the resistance of the biological promoter microcapsule to external forces. And because the porous nanosheets are porous structures, there are a large number of holes in the formed nanosheet layer structure, leaving a channel for the release of the biological promoter. At the same time, part of the nanosheets will be exposed to the outside of the wall material, thus forming protrusions on the surface of the biological promoter microcapsule. These protrusions can then be embedded into the holes of the network structure formed on the pore wall of the zeolite particles, thereby confining the biological promoter microcapsule inside the zeolite particles. Then, through the method of vacuum impregnation, the biological promoter microcapsules are infiltrated into the pores of the pretreated zeolite particles, and nanofibers are added, and vacuum impregnation is continued under mechanical stirring to obtain a supported zeolite composite particle. Under mechanical stirring, the nanofibers cross-link with each other and wrap around the outside of the pretreated zeolite particles to form a wrapping net. On the one hand, it can prevent small particulate matter in the water body from entering the pore channels of the pretreated zeolite particles, hindering the release of the biological promoter and playing a protective role. On the other hand, because the protrusions formed on the surface of the biological promoter microcapsule are composed of porous nanosheets and have holes, under the action of mechanical stirring, some nanofibers will be inserted into the holes, further confining the biological promoter microcapsule and inhibiting the movement of the biological promoter microcapsule in the pore channels of the pretreated zeolite particles, thereby obtaining a supported zeolite composite particle with a stable structure. Moreover, the formed wrapping net increases the surface roughness and surface area of the supported zeolite composite particle, enabling it to contact and combine with the sludge particles in the sediment, and can adhere to the roots of aquatic plants at the bottom of the water body, so that the supported zeolite composite particle can be well retained in the sediment and is not easily lost, thereby being able to continuously and durably exert the repair effect on the sediment.

[0057] The sediment repair agent in the present invention can stably exist in the sediment, and through the synergistic effect among the components, it can provide a good microenvironment for the microorganisms in the sediment. By slowly releasing the biological promoter, it can not only enhance the role of the microorganisms but also improve the utilization rate, accelerate the degradation rate of organic pollutants in the sediment, achieve the best repair effect, and at the same time continuously release the biological promoter, which also inhibits the accumulation of organic pollutants in the sediment, thereby preventing secondary pollution of the sediment and achieving a continuous and efficient sediment repair effect. Specific embodiments

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] In the embodiments of the present invention, the oxidant is prepared from the following materials in parts by weight: 60 parts of calcium peroxide, 20 parts of activated carbon with a mesh size of 30, and 1 part of phosphate.

[0060] The ecological adsorbent consists of the following raw materials in parts by weight: 10 parts of zeolite, 5 parts of gravel, and 2 parts of ceramsite.

[0061] The composite microorganism consists of the following raw materials in parts by weight: 20 parts of EM bacteria, 15 parts of Bacillus subtilis, and 12 parts of Bacillus cereus.

[0062] Example 1

[0063] A sediment remediation agent containing bamboo active ingredients comprises the following components in parts by weight: 30 parts of oxidant, 5 parts of ecological adsorbent, 2 parts of composite microorganism, and 20 parts of supported zeolite composite particles.

[0064] The preparation method of the sediment remediation agent is as follows:

[0065] By weight, the composite microorganism is inoculated into TSB medium, cultured for 2 days and then diluted to obtain a bacterial solution of 10 7 cfu / mL. Then, the oxidant, ecological adsorbent and supported zeolite composite particles are added to the bacterial solution, mixed and stirred into a slurry, adsorbed for 1 day and then air-dried to obtain the sediment remediation agent.

[0066] Among them, the preparation method of the supported zeolite composite particles is as follows:

[0067] S1-1) Add 0.5 g of chitosan to 70 mL of acetic acid solution with a concentration of 1.0 wt%, stir and dissolve fully to obtain a chitosan solution. Add 2 g of whey protein to 100 mL of deionized water, stir well, add 1.0 g of emulsifier Span 80, then add 3 g of eugenol, stir well to obtain a mixed solution, and drop the mixed solution into the chitosan solution, mix well. Then, at room temperature and under the action of 150 W ultrasound, drop 10 mL of an aqueous sodium sulfate solution with a concentration of 1.2 wt% as a cross-linking agent into the mixed solution, perform ultrasonic treatment for 10 min, remove the upper liquid by centrifugation, wash the lower precipitate, and obtain microcapsules.

[0068] S1-2) 1 g of microcapsules were added to 60 mL of 1 wt% sodium alginate solution, mixed and stirred for 10 min, and then centrifuged at 3000 r / min for 5 min to obtain microcapsules with sodium alginate attached to the surface. The microcapsules with sodium alginate attached to the surface were added to 50 mL of 2 wt% calcium chloride aqueous solution, and centrifuged at 3000 r / min for 5 min to obtain solid precipitates. The solid precipitates were washed three times with a 1% volume fraction emulsifier Span 80 solution to obtain crude microcapsules, and finally freeze-dried to obtain double-layer microcapsules.

[0069] S1-3) Sodium hydroxide, hexadecyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol, and isopropanol are mixed in a molar ratio of 0.8:5.0:3.4:1.0:370:19.6:6.0 to obtain a mixture, and then 3% of the total mass of the mixture is added with double-layer microcapsules, and the mixture is placed in a sealed container for crystallization after mixing, and stirred at 800 r / min for 3 hours at 98°C, and then centrifuged at a speed of 12000 r / min for 60 minutes to obtain solid particles;

[0070] S1-4) dispersing the above solid particles in deionized water, centrifuging to remove the supernatant, repeating the operation until the pH of the supernatant drops below 9, then drying the solid particles at 65°C overnight, and then placing them in a calcining furnace, heating them from room temperature to 500°C at a rate of 1°C / min in an air atmosphere, calcining them for 4 hours, and naturally cooling them to room temperature to obtain large-pore zeolite particles;

[0071] S2-1) Dissolve 0.6g of bismuth oxide in 4mL of 37wt% hydrochloric acid, add 46mL of deionized water, then add 0.8g of ferric chloride, stir thoroughly until dissolved, then add 2.6g of ammonium chloride to the above solution, add 12g of sodium hydroxide after dissolution, mix well, then add 8g of large-pore zeolite particles, seal and stir at 800r / min for 20min, then put the precursor into a hydrothermal kettle under 300W ultrasound, hydrothermally react at 200°C for 10h, after the reaction is completed, cool to room temperature, centrifuge the obtained product and dry it to form a precursor;

[0072] S2-2) 8.0 g of potassium antimony tartrate was dissolved in 30 mL of deionized water, and after being fully stirred and dissolved, 0.20 g of polyvinyl pyrrolidone was added, and stirring was continued to dissolve, and then 1.8 g of thioacetamide was added to the mixed solution, and after being fully stirred and mixed, a reaction solution was obtained, and then 5 g of the precursor was added to the reaction solution, and after mechanical stirring at 1000 r / min for 1 hour, it was transferred to a reactor and heated at a constant temperature of 180° C. for 24 hours. After the reaction was completed, it was cooled to room temperature, and the obtained product was centrifuged and dried to obtain pretreated zeolite particles;

[0073] S3-1) Put 0.2 g of nano-magnesium oxide into 100 mL of methanol solution. After ultrasonic dispersion, add 1.2 g of zinc nitrate and stir continuously for 1 h. Then weigh 1.4 g of 2-methylimidazole and disperse it evenly in 300 mL of methanol solution. After mixing the above two solutions, stir and react at 500 r / min at room temperature for 24 h. Centrifuge, wash and dry the product to obtain the template skeleton material;

[0074] S3-2) Crush and grind equal masses of coal tar pitch, potassium bicarbonate and the template skeleton material evenly. After thorough mixing, place them in a tube furnace and heat up to 300 °C at a rate of 5 °C / min. After holding at a constant temperature for 30 min, then heat up to 900 °C, hold at a constant temperature for 1 h and then cool naturally to room temperature. Stir and soak the obtained product in 0.1 mol / L hydrochloric acid for 24 h. After suction filtration, washing and drying, grind and sieve to obtain porous carbon nanosheets;

[0075] S3-3) Prepare a 1 wt% chitosan solution and a 3 wt% polyvinyl alcohol solution respectively. Then add porous carbon nanosheets according to 5% of the mass of the chitosan solution. After thorough mixing and stirring, a chitosan mixed solution is obtained. Then add 2 g of biological promoter, 0.1 g of span 80, 0.1 g of chitosan quaternary ammonium salt and 0.5 mL of polyvinyl alcohol solution to 70 mL of the chitosan mixed solution and emulsify at a rotation speed of 10000 r / min to obtain the core material emulsion;

[0076] The biological promoter is composed of bamboo active substances, vitamins and minerals, pyrimidine, purine, and octenyl succinic anhydride starch ester in a mass ratio of 5:25:10:10:3;

[0077] The bamboo active substances are composed of amino acids, bamboo leaf flavonoids, polysaccharides, and bamboo vinegar liquid in a mass ratio of 1:0.2:0.3:0.1;

[0078] S3-4) Place 80 mL of the core material emulsion in a container. Under stirring conditions, adjust the pH value to 8 with a 10 wt% sodium hydroxide solution to precipitate and coagulate chitosan. Then cool it to below 10 °C with an ice-water bath and add a mixture composed of 0.01 g of glyoxal and 10 mL of deionized water dropwise. The dropping time is 30 min. After dropping, cure thoroughly under stirring for 3 h. After filtration, washing and drying, obtain the biological promoter microcapsules;

[0079] S3-5) Add the pretreated zeolite particles into a vacuum tank, evacuate to 80Pa and maintain for 15 minutes, disperse the biopromoter microcapsules in deionized water to obtain a dispersion with a solid content of 3wt%, and then add the dispersion into a vacuum tank at a solid-liquid ratio of 1:20g / mL, evacuate to 50Pa and maintain for 20 minutes, and then add bamboo cellulose nanofibers at 5% of the mass of the pretreated zeolite particles, stir at 500r / min, and continue to maintain for 15 minutes. After the treatment is completed, slowly release the pressure to normal pressure, centrifuge the product and dry it.

[0080] Example 2

[0081] A sediment repair agent containing bamboo active ingredients, comprising the following components by weight: 40 parts of an oxidant, 7 parts of an ecological adsorbent, 5 parts of composite microorganisms, and 26 parts of supported zeolite composite particles;

[0082] The bottom mud repairing agent has the following preparation method:

[0083] The composite microorganisms were inoculated into TSB medium according to weight proportions, and diluted after culturing for 3 days to obtain 10 8 cfu / mL bacterial solution, and then add oxidant, ecological adsorbent and loaded zeolite composite particles into the bacterial solution, mix and stir to form a slurry, adsorb for 2 days and then air-dry to obtain the sediment remediation agent.

[0084] The preparation method of the supported zeolite composite particles is as follows:

[0085] S1-1) 1.5 g of chitosan was added to 80 mL of 1.3 wt% acetic acid solution, and the solution was fully stirred to obtain a chitosan solution. 3 g of whey protein was added to 120 mL of deionized water, and the solution was fully stirred. Then, 1.5 g of emulsifier Span 80 was added, and then 5 g of eugenol was added, and the solution was fully stirred to obtain a mixed solution. The mixed solution was added dropwise to the chitosan solution and mixed evenly. Then, 15 mL of a 1.3 wt% cross-linking agent sodium sulfate aqueous solution was added dropwise to the mixed solution at room temperature and 200 W ultrasonic treatment. The solution was ultrasonically treated for 15 min, the upper liquid was removed by centrifugation, and the lower precipitate was washed to obtain microcapsules.

[0086] S1-2) 1 g of microcapsules were added to 60 mL of 1 wt% sodium alginate solution, mixed and stirred for 10 min, and then centrifuged at 3000 r / min for 5 min to obtain microcapsules with sodium alginate attached to the surface. The microcapsules with sodium alginate attached to the surface were added to 50 mL of 2 wt% calcium chloride aqueous solution, and centrifuged at 3000 r / min for 5 min to obtain solid precipitates. The solid precipitates were washed three times with a 1% volume fraction emulsifier Span 80 solution to obtain crude microcapsules, and finally freeze-dried to obtain double-layer microcapsules.

[0087] S1-3) Sodium hydroxide, hexadecyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol, and isopropanol are mixed in a molar ratio of 1.0:6.2:4.0:1.2:420:23:7.8 to obtain a mixture, and then double-layer microcapsules accounting for 5% of the total mass of the mixture are added, and after mixing, the mixture is placed in a sealed container for crystallization, and stirred at 98°C at 1000 r / min for 4 hours, and then centrifuged at 13000 r / min for 70 minutes to obtain solid particles;

[0088] S1-4) dispersing the above solid particles in deionized water, centrifuging to remove the supernatant, repeating the operation until the pH of the supernatant drops below 9, then drying the solid particles at 70°C overnight, and then placing them in a calcining furnace, heating them from room temperature to 510°C at a rate of 2°C / min in an air atmosphere, calcining them for 5 hours, and naturally cooling them to room temperature to obtain large-pore zeolite particles;

[0089] S2-1) Dissolve 0.8g of bismuth oxide in 6mL of 37wt% hydrochloric acid, add 60mL of deionized water, and then add 1.2g of ferric chloride, stir thoroughly until dissolved, then add 3.5g of ammonium chloride to the above solution, add 18g of sodium hydroxide after dissolution, mix well, and then add 10g of large-pore zeolite particles, seal and stir at 10200r / min for 25min, then put the precursor into a hydrothermal kettle under 400W ultrasound, hydrothermally react at 205°C for 13h, after the reaction is completed, cool to room temperature, centrifuge the obtained product and dry it to form a precursor;

[0090] S2-2) 8.6 g of potassium antimony tartrate was dissolved in 32 mL of deionized water, and after being fully stirred and dissolved, 0.21 g of polyvinyl pyrrolidone was added, and stirring was continued to dissolve, and then 2.0 g of thioacetamide was added to the mixed solution, and after being fully stirred and mixed, a reaction solution was obtained, and then 7 g of the precursor was added to the reaction solution, and after mechanical stirring at 1300 r / min for 1.5 h, it was transferred to a reactor and heated at a constant temperature of 185°C for 26 h. After the reaction was completed, it was cooled to room temperature, and the obtained product was centrifuged and dried to obtain pretreated zeolite particles;

[0091] S3-1) 0.3 g of nano magnesium oxide was put into 140 mL of methanol solution, and after ultrasonic dispersion, 1.5 g of zinc nitrate was added and stirred for 2 h. Then 1.8 g of 2-methylimidazole was weighed and dispersed in 360 mL of methanol solution. The two solutions were mixed and stirred at 700 r / min at room temperature for 28 h. The product was centrifuged, washed and dried to obtain a template skeleton material.

[0092] S3-2) Grind and mix equal masses of coal tar pitch, potassium bicarbonate, and template framework material evenly. After thorough mixing, place them in a tube furnace, heat up to 310 °C at a rate of 6 °C / min, keep the temperature constant for 40 min, then heat up to 930 °C, keep the temperature constant for 1.5 h, and then naturally cool to room temperature. Stir and soak the obtained product in 0.2 mol / L hydrochloric acid for 26 h, filter, wash, dry, and then grind and sieve to obtain porous carbon nanosheets;

[0093] S3-3) Prepare a 2 wt% chitosan solution and a 5 wt% polyvinyl alcohol solution respectively. Then, add porous carbon nanosheets according to 7% of the mass of the chitosan solution. After thorough mixing and stirring, obtain a chitosan mixed solution. Then, add 5 g of biological promoter, 0.3 g of Span 80, 0.2 g of chitosan quaternary ammonium salt, and 0.8 mL of polyvinyl alcohol solution to 80 mL of the chitosan mixed solution, and emulsify at a rotation speed of 12,000 r / min to obtain a core material emulsion;

[0094] The biological promoter is composed of bamboo active substances, vitamins and minerals, pyrimidine, purine, and octenyl succinic anhydride starch ester in a mass ratio of 8:27:12:12:5;

[0095] The bamboo active substances are composed of amino acids, bamboo leaf flavonoids, polysaccharides, and bamboo vinegar liquid in a mass ratio of 1:0.3:0.5:0.2;

[0096] S3-4) Place 90 mL of the core material emulsion in a container. Under stirring conditions, use an 11 wt% sodium hydroxide solution to adjust the pH value to 8.5 to precipitate and coagulate chitosan. Then, cool it to below 10 °C with an ice-water bath, and add a mixture composed of 0.03 g of glyoxal and 15 mL of deionized water dropwise. The dropping time is 35 min. After dropping, solidify thoroughly under stirring for 4 h, filter, wash, and dry to obtain biological promoter microcapsules;

[0097] S3-5) Add pretreated zeolite particles to a vacuum tank, evacuate to 120 Pa and maintain for 18 min. Disperse the biological promoter microcapsules in deionized water to obtain a dispersion with a solid content of 5 wt%. Then, according to a solid-liquid ratio of 1:25 g / mL, add the dispersion to the vacuum tank, evacuate to 60 Pa and maintain for 25 min. Then, add bamboo cellulose nanofibers according to 7% of the mass of the pretreated zeolite particles, and continue to maintain for 18 min under stirring at 700 r / min. After the treatment is completed, slowly release the pressure to atmospheric pressure, and centrifuge and dry the product.

[0098] Example 3

[0099] A sediment repair agent containing bamboo active ingredients, comprising the following components by weight: 50 parts of an oxidant, 12 parts of an ecological adsorbent, 6 parts of composite microorganisms, and 30 parts of supported zeolite composite particles;

[0100] The bottom mud repairing agent has the following preparation method:

[0101] The composite microorganisms were inoculated into TSB medium according to weight proportions, and diluted after culturing for 3 days to obtain 10 8 cfu / mL bacterial solution, and then add oxidant, ecological adsorbent and loaded zeolite composite particles into the bacterial solution, mix and stir to form a slurry, adsorb for 2 days and then air-dry to obtain the sediment remediation agent.

[0102] The preparation method of the supported zeolite composite particles is as follows:

[0103] S1-1) adding 2.5 g of chitosan to 100 mL of 1.5 wt% acetic acid solution, stirring thoroughly to dissolve, to obtain a chitosan solution, adding 5 g of whey protein to 130 mL of deionized water, stirring thoroughly, adding 1.6 g of emulsifier Span 80, and then adding 7 g of eugenol, stirring thoroughly to obtain a mixed solution, and dropping the mixed solution into the chitosan solution, mixing thoroughly, and then dropping 18 mL of a 1.5 wt% crosslinking agent sodium sulfate aqueous solution into the mixed solution at room temperature and 200 W ultrasonic action, ultrasonically treating for 20 min, removing the upper layer of liquid by centrifugation, washing the lower layer of precipitate, and obtaining microcapsules;

[0104] S1-2) 3 g of microcapsules were added to 90 mL of a 2 wt% sodium alginate solution, mixed and stirred for 30 min, and then centrifuged at 4000 r / min for 10 min to obtain microcapsules with sodium alginate attached to the surface. The microcapsules with sodium alginate attached to the surface were added to 70 mL of a 3 wt% calcium chloride aqueous solution, and centrifuged at 4000 r / min for 10 min to obtain solid precipitates, which were washed five times with a 1% volume fraction emulsifier Span 80 solution to obtain crude microcapsules, and finally freeze-dried to obtain double-layer microcapsules;

[0105] S1-3) Sodium hydroxide, hexadecyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol, and isopropanol are mixed in a molar ratio of 1.2:7.5:5.2:1.5:560:30.0:9.2 to obtain a mixture, and then double-layer microcapsules accounting for 7% of the total mass of the mixture are added, and after mixing, the mixture is placed in a sealed container for crystallization, and stirred at 98°C at 1200 r / min for 5 hours, and then centrifuged at a speed of 15000 r / min for 80 minutes to obtain solid particles;

[0106] S1-4) dispersing the above solid particles in deionized water, centrifuging to remove the supernatant, repeating the operation until the pH of the supernatant drops below 9, then drying the solid particles at 70°C overnight, and then placing them in a calcining furnace, heating them from room temperature to 520°C at a rate of 2°C / min in an air atmosphere, calcining them for 6 hours, and naturally cooling them to room temperature to obtain large-pore zeolite particles;

[0107] S2-1) Dissolve 1.0g of bismuth oxide in 8mL of 37wt% hydrochloric acid, add 78mL of deionized water, and then add 1.4g of ferric chloride, stir thoroughly until dissolved, then add 4.5g of ammonium chloride to the above solution, add 20g of sodium hydroxide after dissolution, mix well, and then add 12g of large-pore zeolite particles, seal and stir at 1200r / min for 30min, then put the precursor into a hydrothermal kettle under 500W ultrasound, hydrothermally react at 210°C for 15h, after the reaction is completed, cool to room temperature, centrifuge the obtained product and dry it to form a precursor;

[0108] S2-2) 9.5 g of potassium antimony tartrate was dissolved in 35 mL of deionized water, and after being fully stirred and dissolved, 0.24 g of polyvinyl pyrrolidone was added, and stirring was continued to dissolve, and then 2.1 g of thioacetamide was added to the mixed solution, and after being fully stirred and mixed, a reaction solution was obtained, and then 8 g of the precursor was added to the reaction solution, and after mechanical stirring at 1500 r / min for 2 h, it was transferred to a reactor and heated at a constant temperature of 190° C. for 30 h. After the reaction was completed, it was cooled to room temperature, and the obtained product was centrifuged and dried to obtain pretreated zeolite particles;

[0109] S3-1) 0.5 g of nano magnesium oxide was put into 180 mL of methanol solution, and after ultrasonic dispersion, 1.8 g of zinc nitrate was added and stirred for 3 h. Then 2.1 g of 2-methylimidazole was weighed and dispersed in 400 mL of methanol solution. The two solutions were mixed and stirred at 800 r / min at room temperature for 30 h. The product was centrifuged, washed and dried to obtain a template skeleton material.

[0110] S3-2) Grind coal tar, potassium bicarbonate and template skeleton materials of equal mass evenly, mix thoroughly and place in a tube furnace, heat to 320°C at 7°C / min, keep constant temperature for 50min, then heat to 950°C, keep constant temperature for 2h and naturally cool to room temperature, soak the obtained product in 0.2mol / L hydrochloric acid with stirring for 30h, filter, wash, dry and grind to obtain porous carbon nanosheets;

[0111] S3-3) Prepare a chitosan solution with a concentration of 3wt% and a polyvinyl alcohol solution with a concentration of 6wt%, then add porous carbon nanosheets according to 8% of the mass of the chitosan solution, mix and stir thoroughly to obtain a chitosan mixed solution, then add 6g of biopromoter, 0.5g of Span 80, 0.3g of chitosan quaternary ammonium salt, and 1.2mL of polyvinyl alcohol solution to 90mL of the chitosan mixed solution, emulsify at a speed of 15000r / min to obtain a core material emulsion;

[0112] The biological accelerator is composed of bamboo active substances, vitamins and minerals, pyrimidine, purine, and octenyl succinate starch ester in a mass ratio of 10:30:13:13:7;

[0113] The bamboo active substance is composed of amino acids, bamboo leaf flavonoids, polysaccharides, and bamboo vinegar in a mass ratio of 1:0.5:0.7:0.3;

[0114] S3-4) placing 100 mL of the core material emulsion in a container, adjusting the pH value to 9 with a 12 wt % sodium hydroxide solution under stirring conditions, causing chitosan to precipitate and condense, then cooling the temperature to below 10° C. with an ice water bath, and adding a mixture of 0.05 g of glyoxal and 16 mL of deionized water by dropwise addition for 40 min. After the dropwise addition is completed, fully curing is performed under stirring for 5 h, and the biopromoter microcapsules are obtained by filtering, washing, and drying.

[0115] S3-5) Add the pretreated zeolite particles into a vacuum tank, evacuate to 150Pa and maintain for 20 minutes, disperse the biopromoter microcapsules in deionized water to obtain a dispersion with a solid content of 7wt%, and then add the dispersion into a vacuum tank at a solid-liquid ratio of 1:30g / mL, evacuate to 70Pa and maintain for 30 minutes, and then add bamboo cellulose nanofibers at 8% of the mass of the pretreated zeolite particles, and continue to maintain for 20 minutes under stirring at 800r / min. After the treatment is completed, slowly release the pressure to normal pressure, centrifuge the product and dry it.

[0116] Comparative Example 1: This comparative example is basically the same as Example 1, except that it does not contain supported zeolite composite particles and is replaced by 2 g of bioaccelerator.

[0117] Comparative Example 2: This comparative example is basically the same as Example 1, except that in the preparation of the supported zeolite composite particles, step S1-2) is omitted.

[0118] Comparative Example 3: This comparative example is basically the same as Example 1, except that S2-1) is omitted in the preparation of the supported zeolite composite particles.

[0119] Comparative Example 4: This comparative example is basically the same as Example 1, except that in the preparation of the supported zeolite composite particles, S2-2) is omitted.

[0120] Comparative Example 5: This comparative example is basically the same as Example 1, except that in the preparation of the supported zeolite composite particles, the bamboo cellulose nanofibers in S3-5) are omitted.

[0121] Test experiment:

[0122] Collect the sediment samples from a certain black and odorous water body. Weigh 0.5 kg of sediment samples and place them in 9 containers with 6 L of clear water respectively. The water in the containers is in a circulating flow state with a flow rate of 1 L / min. Then, add 10 g of the sediment remediation agents obtained in Examples 1-3 and Comparative Examples 1-5 above to the containers respectively. No sediment remediation agent is added to another container as a control group. After 10 days, the test results are shown in Table 1.

[0123] Table 1

[0124]

[0125] As can be seen from Table 1, the sediment remediation agent in the present invention can promote the degradation of organic pollutants in the sediment and improve the water quality in a flowing water body.

[0126] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A sediment remediation agent containing bamboo active ingredients, characterized in that, The invention comprises the following components by weight: 30-50 parts of oxidant, 5-12 parts of ecological adsorbent, 2-6 parts of composite microorganisms, and 20-30 parts of loaded zeolite composite particles; The ecological adsorbent is composed of the following raw materials in weight ratio: 10-20 parts of zeolite, 5-8 parts of gravel, and 2-5 parts of ceramsite; The preparation method of the supported zeolite composite particles is as follows: S1, adding double-layer microcapsules to the synthetic raw materials of zeolite particles, and calcining at high temperature to obtain large-pore zeolite particles; The double-layer microcapsule is prepared by freeze-drying with eugenol as the core material and chitosan, whey protein and sodium alginate as the wall material; The high temperature calcination is carried out at a temperature of 500-520° C. for 4-6 hours; S2 generates protruding nanosheets on the pore walls of the large-pore zeolite particles through an ultrasound-assisted hydrothermal reaction, and generates a mesh film through a secondary hydrothermal reaction to embed and cover the nanosheets, thereby obtaining pretreated zeolite particles; The ultrasonic-assisted hydrothermal reaction has an ultrasonic power of 300-500 W, a hydrothermal reaction temperature of 200-210° C., and a reaction time of 10-15 h. The secondary hydrothermal reaction temperature is 180-190°C and the reaction time is 24-30h; The specific operation of S2 is as follows: Bismuth oxide, ferric chloride, ammonium chloride and sodium hydroxide are used as raw materials for synthesizing nanosheets. After being stirred and mixed with large-pore zeolite particles, a precursor is formed through a hydrothermal reaction under ultrasound. Then, potassium antimony tartrate and thioacetamide are used as antimony sources and sulfur sources respectively, and the precursor is used as a matrix material. After a hydrothermal reaction, a mesh film is formed on the nanosheet for embedding and covering. The mass ratio of the bismuth oxide, ferric chloride, ammonium chloride, sodium hydroxide and large-pore zeolite particles is (0.6-1.0): (0.8-1.4): (2.6-4.5): (12-20): (8-12); The mass ratio of potassium antimony tartrate, thioacetamide and precursor is (8.0-9.5): (1.8-2.1): (5-8); S3: After the bioaccelerator is microencapsulated, it is infiltrated into the pretreated zeolite particles by vacuum impregnation and fully mixed with the nanofibers; The specific operation steps of S3 are as follows: The single coagulation method is adopted, chitosan and chitosan quaternary ammonium salt are used as composite wall materials, porous carbon nanosheets are added to the wall materials, and the biopromoter is used as the core material. The biopromoter is microencapsulated to obtain biopromoter microcapsules, and then the biopromoter microcapsules are infiltrated into the pores of the pretreated zeolite particles by vacuum impregnation, and then nanofibers are added, and vacuum impregnation is continued under mechanical stirring; The nanofibers are bamboo cellulose nanofibers, and the amount added is 5-8% of the mass of the pretreated zeolite particles; The biological promoter is composed of bamboo active substances, vitamins and minerals, pyrimidine, purine, and octenyl succinate starch ester in a mass ratio of (5-10): (25-30): (10-13): (10-13): (3-7); The bamboo active substance is composed of amino acids, bamboo leaf flavonoids, polysaccharides, and bamboo vinegar solution in a mass ratio of 1:(0.2 - 0.5):(0.3 - 0.7):(0.1 - 0.3); The preparation method of the biological promoter microcapsule is as follows: 1) Add porous carbon nanosheets to the chitosan solution to obtain a chitosan mixed solution, and then add the biological promoter, Span 80, chitosan quaternary ammonium salt, and polyvinyl alcohol solution to the chitosan mixed solution, and emulsify to obtain the core material emulsion; 2) Place the core material emulsion in a container, adjust the pH value to 8 - 9 under stirring conditions, then cool it to below 10°C with an ice-water bath, and add a mixture composed of glyoxal and deionized water dropwise. After the dropping is completed, fully cure it for 3 - 5 h under stirring, filter, wash, and dry to obtain the biological promoter microcapsule.

2. The sediment remediation agent containing bamboo active ingredients according to claim 1, characterized in that, The oxidant is prepared from the following materials in the following weight ratios: 60 - 80 parts of calcium peroxide, 20 - 27 parts of activated carbon with a particle size of 30 - 50 mesh, and 1 - 2 parts of phosphate; The composite microorganism is composed of the following raw materials in the following weight ratios: 20 - 30 parts of EM bacteria, 15 - 25 parts of Bacillus subtilis, and 12 - 17 parts of Bacillus cereus.

3. The sediment remediation agent containing bamboo active ingredients according to claim 1, characterized in that, The synthesis raw materials of the zeolite particles are a mixture composed of sodium hydroxide, cetyltrimethylammonium bromide, silicon dioxide, aluminum oxide, deionized water, ethanol, and isopropanol in a molar ratio of (0.8 - 1.2):(5.0 - 7.5):(3.4 - 5.2):(1.0 - 1.5):(370 - 560):(19.6 - 30.0):(6.0 - 9.2); The double-layer microcapsule accounts for 3 - 7% of the total mass of the synthesis raw materials of the zeolite particles.

4. The sediment remediation agent containing bamboo active ingredients according to claim 1, characterized in that The concentration of the chitosan solution is 1 - 3 wt%; The concentration of the polyvinyl alcohol solution is 3 - 6 wt%; The addition amount of the porous carbon nanosheets is 5 - 8% of the mass of the chitosan solution; The ratio of the biological promoter, Span 80, chitosan quaternary ammonium salt, polyvinyl alcohol solution, and chitosan mixed solution is (2 - 6) g:(0.1 - 0.5) g:(0.1 - 0.3) g:(0.5 - 1.2) mL:(70 - 90) mL; The ratio of the core material emulsion, glyoxal, and deionized water is (80 - 100) mL:(0.01 - 0.05) g:(10 - 16) mL.

5. A preparation method of the sediment remediation agent containing bamboo active ingredients according to claim 1, characterized in that, The specific method is as follows: In parts by weight, the composite microorganism is inoculated into a TSB medium, cultured for 2 - 3 d and then diluted to obtain a bacterial solution with a concentration of 10 7 -10 8 cfu / mL. Then, an oxidant, an ecological adsorbent and a supported zeolite composite particle are added to the bacterial solution, and the mixture is stirred into a slurry. After adsorption for 1 - 2 d, it is air-dried to obtain the sediment repair agent.

Images