72 results about "Cadmium adsorption" patented technology

The invention relates to a high-cadmium-adsorption filamentous fungus Paecilomyces lilacinus XLA, and a preparation method and an application thereof. The preparation method comprises the following steps: 1, weighing a pot experiment soil sample used for heavy metal restoration and having a content of heavy metal cadmium of 50mg / Kg, adding to sterile water with glass beads, oscillating on a constant temperature shaking table, allowing an obtained solution to stand, taking an obtained supernatant, and carrying out serial dilution; 2, coating a Martin flat containing 60mM of cadmium with different dilution rates of dilutions, allowing the obtained flat to stand for a moment, inverting on a constant temperature culturing box, and culturing; 3, carrying out streaking purification of single colonies growing on the flat, coating the Martin flat with the obtained single colonies, and culturing; 4, carrying out separating screening to obtain the Paecilomyces lilacinus XLA stably resisting cadmium, and preserving on a PDA inclined plane for later use. The Paecilomyces lilacinus XLA is preserved and has a preservation number of CCTCC NO:M2012135. Viable and non-viable organism of the XLA can efficiently adsorb and remove the heavy metal cadmium in heavy metal sewage, so the XLA has the advantages of low cost and simple technology, and has an efficient restoration potential of heavy metal polluted soil and water.

The invention discloses a screening method for heavy metal cadmium adsorption mutants of Chlamydomonas reinhardtii. The screening method comprises: selecting a suitable screening concentration for heavy metal cadmium adsorption mutants according to the influence of different cadmium chloride concentrations on the growth of Chlamydomonas reinhardtii; Transformation to obtain Chlamydomonas reinhardtii mutants; screening out heavy metal cadmium adsorption mutants of Chlamydomonas reinhardtii, the screening of heavy metal cadmium adsorption mutants of Chlamydomonas reinhardtii includes screening heavy metal cadmium sensitive mutants and screening heavy metal cadmium resistant mutants; identification screening Mutant genes of heavy metal cadmium adsorption mutants of Chlamydomonas reinhardtii. The invention achieves the technical effect of being able to obtain a large amount of Chlamydomonas heavy metal cadmium adsorption mutants simply and efficiently.

The invention discloses a method for planting suaeda salsa at a medium-low-cadmium saline-alkaline land and for extracting plant salt. The method comprises the steps of saline-alkaline land selection, saline-alkaline land improvement, soil cadmium adsorption treatment, and plant salt extraction. According to the soil cadmium adsorption treatment step, amaranthus retroflexus and elymus dahuricus are inter-planted and used for adsorbing cadmium in soil, wherein a preferable inter-planting ratio of amaranthus retroflexus and elymus dahuricus is 4:1, and a planting density is preferably 10*40cm. In the plant salt provided by the invention, cadmium content is reduced to 0.002mg / kg, sodium chloride content is 39%, potassium chloride content is 12%, Mg content is 4%, Ca content is 8%, and Fe content is 750mg / kg. With the method, a problem of excessively high cadmium content in plant salt extracted from suaeda salsa planted in the medium-low-cadmium saline-alkaline land is effectively solved.

A heavy metal cadmium deactivator for activating the activity of sulfur-reducing bacteria in rice field soil, and an application thereof. The deactivator is constituted by electron shuttles alone or electron shuttles and electron donors, but cannot be constituted by electron donors alone. The mass ratio of the electron donors to the electron shuttles is (1:3)-(1:8). Also, a heavy metal cadmium deactivating method for activating the activity of microorganisms in rice field soil, such as sulfur-reducing bacteria. By applying the functional deactivator to rice field soil, the activity of microorganisms, such as sulfur-reducing bacteria, can be activated, thereby accelerating the reduction process of sulfur and iron in soil to facilitate the fixation of cadmium; cadmium adsorption and accumulation in rice is reduced to achieve secure production in fields moderately or lightly polluted by cadmium.

A method for removing cadmium ions from wastewater by adsorption-precipitation with waste beer yeast comprises the steps of preparing waste beer yeast adsorbent from waste beer yeast, adding into cadmium-containing wastewater solution, adjusting pH in the range of 5-8, stirring at room temperature and stirring speed of 800-1,000 r / min, standing for 120-210 min, and removing the waste beer yeast adsorbent with adsorbed cadmium ions. The inventive method removes cadmium ions from cadmium-containing wastewater by utilizing good cadmium adsorption and good precipitation effect of waste beer yeast; has the advantages of simple process, high treatment efficiency, low cost, and no secondary pollution; and is very important for controlling cadmium-containing wastewater pollution.

The invention discloses filamentous fungi Epicoccum nigrum FXZ2 which is collected at a China General Microbiological Culture Collection Center. The collection number of the Epicoccum nigrum FXZ2 is CGMCC NO. 13573. The strain is applied to biological remediation of heavy metal lead and cadmium pollution. Experiments prove that the Epicoccum nigrum FXZ2 has high tolerance and adsorptivity for lead and cadmium, the cadmium adsorption capacity of phage of the strain is higher than that of active bacteria, the lead adsorption capacity of the active bacteria is higher than that of the phage, and the strain can remarkably promote plant growth under stress of heavy metal pollution, has good accumulation capacity for cadmium and is suitable for in-situ remediation of large-area heavy metal cadmium polluted soil.

The present invention discloses a bagasse composite soil conditioner preparation method, wherein the main byproduct bagasse of sugar production from sugarcane is adopted as a raw material, and is combined with starch and kaolin through a graft copolymerization method so as to prepare the soil conditioner having high heavy metal adsorption capacity, wherein the bagasse contains a lot of cellulose, such that the application of the bagasse to prepare the soil repair agent has economic values and significant environmental significance. According to the present invention, the main byproduct bagasse of the sugar production industry and the natural products such as starch and kaolin are adopted as the raw materials, the characteristics of reasonable process route and reliable product performance are provided, the prepared composite material has the high heavy metal adsorption and the high soil repair capability, the method has advantages of increase of the comprehensive utilization of the sugar mill byproduct, no secondary pollution and the like, and the soil repair agent prepared by using the method can effectively absorb heavy metals in the soil, wherein the cadmium adsorption rate achieves more than 45%, and the copper adsorption rate achieves more than 52%.

The invention discloses an Enterobacter sp. FM-1 obtained through separation from mining soil, purifying and domestication, deposited at China Typical Culture Collection on December22, 2017, the deposit number of which is CCTCC M2017825. The method comprises such steps as taking soil, culturing soil, obtaining initial extracting solution, enriching culture with LB liquid medium, purifying culturewith LB solid medium, inoculating single colony into LB plate medium containing cadmium for further domestication and culture, and obtaining Enterobacter sp. FM-1 with high tolerance to cadmium. The Enterobacter sp. FM-1 has good tolerance and adsorption properties to cadmium. The adsorption of cadmium in the medium containing 4 mmol L-1 cadmium. The maximum adsorption rate of cadmium was 80.36% at 30 DEG C and pH 7. 190.45 mg g-1 of cadmium adsorption capacity was added under sterile operation at this time. The strain can be applied to the remediation of cadmium polluted water and soil with phytoremediation, and has a wide application prospect.

The invention discloses high-cadmium-adsorption filamentous fungi penicillium chrysogenum J-5 as well as a preparation method and an application thereof. The preparation method comprises the following steps of: firstly weighing and putting 10g of cadmium polluted soil into 90mL of sterilized normal saline, vibrating on a constant-temperature shaking table, standing, taking supernatant liquid and diluting; secondly coating different dilution factors of diluent on a Martin rose-bengal flat plate containing 10mM of cadmium, and inversely placing the flat plate in a constant-temperature incubator for cultivation; thirdly, carrying out streaking and purification on microorganisms which grow on the flat plate, and then coating the organisms on the Martin rose-bengal flat plate containing cadmium again for cultivation; fourthly, after isolation and screening, storing a bacterial strain having stable resistance capacity on cadmium on a PDA (Potato Dextrose Agar) inclined plane. The obtained filamentous fungi penicillium chrysogenum J-5 has high tolerance and high adsorption property on multiple metals; the raw materials are easy to obtain and low in cost. The bacterial strain has relatively high fixation capacity on heavy metals in environments, can be used of reducing the biological toxic property of the heavy metals and is suitable for the in-situ remediation of large-area polluted soil.

The invention provides an adsorption plate used for soil heavy metal cadmium adsorption and a preparation method thereof; rice straw and / or rice husk are / is modified by phosphoric acid, and then mixed with sodium alginate to prepare a homogenate, the homogenate is added into a hollow cylindrical mold with an inner cavity, the cylindrical mold comprises a bottom surface and a side face tube which is in sealed connection with the edge of the bottom surface, a plurality of mutually parallel pillars are uniformly arranged on the bottom inner surface of the inner cavity of the mold in the direction of being perpendicular to the base plane of the mold, and the mold filled with the homogenate is frozen for shaping at the temperature of-20 DEG C, and then is demoulded to prepare a sodium alginate-rice straw and rice husk particle porous adsorption plate. The invention also provides application of the porous adsorption plate prepared by the method in adsorption and fixing of heavy metal cadmium in soil. The method has the advantages of simple operation and low cost, does not cause secondary pollution, and can be widely applied to repair of heavy metal cadmium polluted soil.

The invention discloses a method of reducing cadmium ions by M13 phage-mediated nano-iron and belongs to the field of environmental pollution governance and nano material preparation. According to the method, iron-adsorbed special M13 phage is adopted to synthesize uniformly dispersed zero-valent nano-iron particles in a mediated manner, and adopts cadmium-adsorbed special M13 phage M13 (Cd-s) to uniformly disperse divalent cadmium ions; then, the zero-valent nano-iron mediated and dispersed by the M13 phage is taken as a reducing agent so as to efficiently reduce divalent cadmium ions uniformly dispersed on the surface of M13(Cd-s). The method disclosed by the invention is high in reducing efficiency, quick in reaction, capable of efficiently catalyzing the divalent ions to be reduced into zero-valent cadmium on the phage surface, so that cadnimum pollution in environment is removed, and nano-particles of zero-valent iron, iron oxide and zero-valent cadmium also can be quickly prepared.

The invention discloses a method for detecting absorption effect of an absorbent by adopting sulfydryl cotton. The method is a follow-up analysis method for adsorption experiments of heavy metals (mercury, lead and cadmium) in waste incineration smoke. A tube containing the sulfydryl cotton is connected at the tail of a smoke experiment device for absorbing heavy metal for the follow-up adsorption analysis, the used sulfydryl cotton can adsorb the heavy metals strongly and is easy to wash out, the adsorption effect is obvious, the heavy metals in the smoke passing through the absorbent can be adsorbed completely, not only can the adsorption effect of the absorbent be detected accurately, but also the sulfydryl cotton used for heavy metal adsorption can be reused. The method is easy to operate, and the adsorption performance of various absorbents can be evaluated effectively, so that high quality absorbent which is low in cost and has mild reaction condition and good adsorption effect can be screened out, secondary pollution is effectively controlled and the method is safe and environment-friendly.

The invention discloses a biochar and its preparation method and application. The biochar is prepared by using Wedelia chinensis as a raw material. The preparation method is as follows: cleaning, drying and pulverizing the wedelia chinensis; placing the wedelia chinensis powder in nitrogen gas, The temperature for activation of Wedelia powder is 400-700°C, and the activation time is 0.5-10 hours; cooling to obtain the primary product of biochar; crushing the primary product of biochar to obtain biochar; the operation method of biochar to reduce cadmium in wastewater is: wastewater The concentration of cadmium in the medium is 10-550mg / L, the pH value of the wastewater is 2-8, the dosage of biochar is 0.5-1.5mg / mL, the adsorption time is 5min-24h, the temperature is 25°C, and the oscillation rate is 250rpm. The biological charcoal of the present invention is prepared by using the Wedelia chinensis as a raw material, which can not only absorb heavy metals in wastewater, but also eliminate the invasion hazard caused by the Wedelia chinensis; meanwhile, the wedelia chinensis biochar has a strong ability to adsorb cadmium.

The invention relates to a plant material adsorbent for reducing the cadmium content of tobacco extracting liquid. The plant material adsorbent is prepared by adopting the steps: crushing root systems of pokeberry serving as raw materials; soaking the crushed materials into diluted acid and performing modification treatment; and filtering and then washing with deionized water to finally obtain the plant material adsorbent. The tobacco extracting liquid with the reduced cadmium content is obtained by adding the plant material adsorbent into the tobacco extracting liquid, adsorbing, and filtering and removing the plant material adsorbent. The plant material adsorbent has the advantages that the root systems of the modified cadmium hyperaccumulator plants, namely, pokeberry are used as the adsorbent, the cadmium content in the root systems of the pokeberry can reach 2 percent, the pokeberry has a large number of cadmium adsorption sites, and the adsorption sites of heavy metal of the pokeberry can be released through modification by diluted acid; the modified plant material is added into the tobacco extracting liquid and can adsorb the cadmium ions in the tobacco extracting liquid, and the possibility of adding non-plant components into the tobacco extracting liquid is avoided. The plant material adsorbent is simple in treatment process, easy to operate, low in cost and reusable.

The invention provides preparation of a potassium permanganate modified heavy metal cadmium adsorbent, wherein marine pollutant enteromorpha is used as a raw material; the raw material source is rich,the cost is low, the marine pollutant enteromorpha can be turned into wealth, and the potassium permanganate modified heavy metal cadmium adsorbent has important significance in marine pollution treatment and removal of heavy metals in water; meanwhile, the potassium permanganate modified enteromorpha charcoal adsorbent has the advantages of large specific surface area and high adsorption efficiency, the heavy metal cadmium adsorption efficiency of the potassium permanganate modified enteromorpha charcoal adsorbent is improved by 20 times or above compared with that of non-modified enteromorpha charcoal; therefore, the invention provides a new adsorbent material is provided for adsorbing heavy metal cadmium.

The invention discloses a preparation method of a microbial cadmium removal absorbent and an application of the absorbent in cadmium removal of the powder food. The preparation method of the microbialcadmium removal absorbent comprises the following steps of: diluting a lactobacillus plantarum solution with water after centrifugation to form a lactobacillus plantarum suspension, dissolving polyvinyl alcohol and sodium alginate in distilled water, adding the lactobacillus plantarum suspension and kieselguhr for stirring to form a mixed solution, adding the mixed solution into a CaCl2 solutionfor cross-linking reaction to form a microbial pellet, and separating the microbial pellet from the CaCl2 solution to form the microbial cadmium removal absorbent. When the microbial cadmium removal absorbent is applied to cadmium removal treatment of the powder food with the excessive cadmium, the heavy metal cadmium in a raw material is absorbed by acid production capability and chemical structures of microorganisms and good absorbability of the kieselguhr; a cadmium content in the powder food with the excessive cadmium can be reduced significantly; and the cadmium is easy to separate.

The invention provides a penicillium oxalicum strain capable of degrading cellulose and adsorbing cadmium. The penicillium oxalicum strain is classified and named as Penicilliumoxalicum WAF6, and thepreservation number of the penicillium oxalicum strain is ACCC 32731. The cadmium ion concentration tolerance range of the penicillium oxalicum strain is 0-150 mg / L; the penicillium oxalicum strain can produce cellulase, has a good degradation effect on rice straw, and is basically degraded on the 15th day when applied to degradation of the rice straw; meanwhile, the strain has the capacity to absorb heavy metal cadmium, and the penicillium oxalicum strain has a cadmium adsorption rate greater than 76% on the 30th day when applied to the treatment of cadmium-contaminated soil. The strain is applied to the bioremediation of a cadmium-contaminated rice field, and can achieve an effect of restoring the soil metal cadmium contamination while degrading the rice straw.

The invention discloses high-cadmium-adsorption filamentous fungi hair mold XLC as well as a preparation method and an application thereof. The preparation method comprises the following steps of: weighing and adding pot experiment soil sample containing 50mg.Kg<-1> of heavy metal cadmium for heavy metal restoration in sterile water added with glass beads, vibrating on a constant-temperature shaking table, standing, taking supernatant liquid and diluting; coating different dilution factors of diluent on a Martin solid culture medium containing cadmium, and inversely placing the flat plate in a constant-temperature incubator for cultivation; carrying out streaking and purification on microorganisms which grow on the culture medium, carrying out secondary screening and verification, thus obtaining the filamentous fungi hair mold XLC bacterial strain having stable resistance capacity on cadmium after isolation and screening, and storing on a PDA (Potato Dextrose Agar) inclined plane for standby application. The preservation number of the bacterial strain is CCTCC NO: M2012136. The cadmium adsorption capacity of the active thallus of the bacterial strain is higher than that of a dead thallus. The bacterial strain has high-efficiency removal capacity on cadmium in electroplating wastewater treatment and can be used for repairing the cadmium pollution in water and soil in practical application.

The invention provides a preparation method for reed-based active carbon. The preparation method comprises the following steps: taking reed, drying and crushing the reed, mixing obtained dry reed powder with acetic acid, phosphoric acid, sodium alginate and water, carrying out impregnation at 30 to 40 DEG C for 12 to 24 h and then carrying out drying; mixing the obtained modified dry powder with sodium carbonate and sodium dodecyl sulfate, then carrying out dispersion, carrying out heating 100 to 120 DEG c and maintaining the temperature for 10 to 20 min; and heating the obtained mixture in a nitrogen atmosphere to 700 to 800 DEG C for carbonization for 120 to 200 min and carrying out cooling and grinding. The active carbon prepared in the invention has a specific surface area of 2157 m<2> / g or above, a pore volume of 0.532 cm<3> / g, an average bore diameter of 2.6 nm, lead adsorption quantity of 52.6 mg / g or above, cadmium adsorption quantity of 43.5 mg / g or above and chromium adsorption quantity of 47.3 mg / g or above, and can well adsorb heavy metal ions.

The invention discloses a magnetic microsphere capable of absorbing cadmium ions and complexes thereof. The surface of a ferroferric oxide / polyacrylic acid composite material is grafted with 4-phenyl-3-thiosemicarbazide, and the ferroferric oxide / polyacrylic acid composite material is of a composite structure which utilizes magnetic nano ferroferric oxide particles as a core and has polyacrylic acid wrapping the surface of the core. The preparation method comprises the following steps: firstly preparing the ferroferric oxide / polyacrylic acid composite material, then performing activating treatment on the ferroferric oxide / polyacrylic acid composite material, and finally grafting 4-phenyl-3-thiosemicarbazide on the surface of the ferroferric oxide / polyacrylic acid composite material, thereby obtaining the magnetic microsphere. The magnetic microsphere disclosed by the invention is capable of effectively absorbing cadmium ions and complexes thereof in industrial wastewater, achieves a removal rate greater than or equal to 95%, and has a cadmium adsorption amount greater than or equal to 175.2mg / g. According to the preparation method, the ferroferric oxide / polyacrylic acid composite material is synthesized by one step, so that the preparation process is simplified.

The invention discloses protease and a method for preparing low-cadmium rice polypeptide from the protease, and belongs to the technical field of bio-enzymes. The neutral protease suitable for industrial production provided by the invention has the advantages that the enzyme activity can be up to 5898.5 U / mL, the cadmium ion adsorption capability is realized, the enzymatic hydrolysis reaction conditions are mild, the reaction period is short, and one-step hydrolysis and adsorption can be realized. The content of rice protein peptide prepared from the protease is up to 97.2 percent, the cadmiumcontent is only 0.078 mg / kg, and the cadmium adsorption rate is 90 percent or above. By adopting the method, the industrial production cost can be lowered effectively, and green production of safe foods is realized.

The invention provides a purpureo cilliumsp with high resistance on cadmium, and an extracting method and application thereof. The bacterial strain belongs to purpureo cilliumsp, and is registered andpreserved in CGMCC (China General Microbiological Culture Collection Center) on September 12th, 2017; the preservation number is CGMCC No.14159; the ITS sequence is shown as SEQ.ID.NO:1. The bacterial strain has a cadmium adsorption function; the cadmium in soil can be adsorbed; the absorption of plants on the cadmium is reduced, so that the plant growth is promoted.

The invention discloses a cadmium removing adsorbent for marine products and a preparation method of the cadmium removing adsorbent. The cadmium removing adsorbent for the marine products is preparedfrom the following raw materials in part by weight: 20-30 parts of modified silica powder, 50-70 parts of fish bone meal, 25-50 parts of modified shell powder, 15-30 parts of shrimp shell powder, 10-30 parts of a complexing agent, 3-5 parts of sodium carbonate and 200-400 parts of a solvent. The invention further provides the preparation method of the cadmium removing adsorbent for the marine products. The method comprises the following steps: mixing the raw materials, drying the raw materials at 70-90 DEG C and grinding the raw materials into 30-50 meshes after drying. When the prepared cadmium removing adsorbent for the marine products is used for removing cadmium from the marine products, the marine products are not needed to be ground, and the cadmium removing rate is high; besides, daily domestic wastes such as shells, fish bones, shrimp shells and the like are recycled and turned into valuables, which is good for environmental protection and reduces the cost; meanwhile, the adsorbent has a certain removal effect on arsenic while effectively adsorbing cadmium.

The invention discloses a preparation method and application of an adsorbent for adsorbing heavy metal ions. A dispersion of two-dimensional nanosheets is obtained through alkali metal ion intercalation, liquid phase stripping and centrifugal screening of a layered clay material used as a raw material, and is used for efficiently adsorbing the heavy metal ions in sewage. The stripped two-dimensional nanosheets are large in acting area and high in adsorption capacity and are dispersed into water to prepare the adsorbent. The adsorbent has the advantages of large adsorption capacity, good stability, wide adaptive temperature range and the like, and can effectively remove common heavy metal ions (nickel, cobalt and cadmium) in sewage. The preparation method of the adsorbent has the advantagesof environmental friendliness, safety, easiness in operation and the like. In addition, the clay material is low in price in nature and easy to obtain, and the preparation cost can be effectively reduced.

The invention relates to a plant material adsorbent for reducing the cadmium content of tobacco extracting liquid. The plant material adsorbent is prepared by adopting the steps: crushing root systems of pokeberry serving as raw materials; soaking the crushed materials into diluted acid and performing modification treatment; and filtering and then washing with deionized water to finally obtain the plant material adsorbent. The tobacco extracting liquid with the reduced cadmium content is obtained by adding the plant material adsorbent into the tobacco extracting liquid, adsorbing, and filtering and removing the plant material adsorbent. The plant material adsorbent has the advantages that the root systems of the modified cadmium hyperaccumulator plants, namely, pokeberry are used as the adsorbent, the cadmium content in the root systems of the pokeberry can reach 2 percent, the pokeberry has a large number of cadmium adsorption sites, and the adsorption sites of heavy metal of the pokeberry can be released through modification by diluted acid; the modified plant material is added into the tobacco extracting liquid and can adsorb the cadmium ions in the tobacco extracting liquid, and the possibility of adding non-plant components into the tobacco extracting liquid is avoided. The plant material adsorbent is simple in treatment process, easy to operate, low in cost and reusable.

The invention discloses a preparation method of a lead-arsenic-cadmium adsorption material. The method comprises the following steps of (1) drying and crushing rape straw, sieving and compacting the crushed rape straw, carrying out pyrolysis carbonization under an oxygen limiting condition or an oxygen-free condition, and performing cooling under an inert gas environment to obtain a material A; (2) drying and crushing tea leaf residues, mixing the crushed tea leaf residues with an iron salt solution, then performing aging, drying and compacting on the obtained mixture, carbonizing the mixtureunder the oxygen limiting condition or the oxygen-free condition, and cooling the mixture under an inert gas environment to obtain a material B; (3) mixing the material A with the material B to obtainthe lead-arsenic-cadmium adsorption material. The lead-arsenic-cadmium adsorption material prepared through the method can adsorb ions of heavy metal such as lead, arsenic and cadmium at the same time, the competitive adsorption is small, and the adsorption performance is excellent; meanwhile, the effective arsenic content of ammonium nitrate leached from soil can be reduced by 71% or above, theeffective cadmium content can be reduced by 66% or above, the effective lead content can be reduced by 72% or above, and the removal rate of lead, arsenic and cadmium is high at the same time.

A preparing method of a heavy metal adsorption material for a polluted water body is disclosed. Agricultural waste corn straw is fully utilized in the method, and is adopted after being modified as the heavy metal cadmium adsorption material for the polluted water body. The material has high adsorbability and achieves good adsorption effects in practical application. The invention also discloses the heavy metal adsorption material prepared by the method and used for the polluted water body.

The invention provides a cadmium-reducing base material for ligusticum wallichii planting, a fertilizer and application of the base material. The base material comprises an organic fertilizer obtained through kitchen waste treatment, a calcium magnesium phosphate fertilizer and biological bacteria, the organic fertilizer obtained through kitchen waste treatment contains organic matter and humic acid, and the biological bacteria comprise bacillus laterosporus and bacillus subtilis. The organic fertilizer and the calcium magnesium phosphate fertilizer are used for improving the physical and chemical properties of soil and reducing the effectiveness of soil cadmium so as to reduce the cadmium adsorption of ligusticum wallichii; and two biological bacteria, namely bacillus laterosporus and bacillus subtilis, are combined and can be used in two ways, root promotion and cadmium reduction are realized, and synergistic interaction is realized. The fertilizer comprises the following components in parts by weight: 10-22 parts of zinc sulfate, 18-22 parts of sodium silicate and 400-650 parts of a base material for cadmium reduction in ligusticum wallichii planting. Zinc sulfate and cadmium in the fertilizer have antagonism, so that the cadmium adsorption of ligusticum wallichii can be reduced. Sodium silicate and cadmium form insoluble cadmium silicate, so that the effectiveness of cadmium can be reduced, and meanwhile, the cell wall of ligusticum wallichii is strengthened to improve the resistance to various diseases.

The invention discloses a cadmium ion adsorbent and a preparation method thereof. According to the preparation method, through condensation reactions between carboxyl and amino, a functional reagent I(alginate) and a functional reagent II are connected; then cadmium ion adsorbent hydrogel is prepared from an alkaline-earth metal ion solution; and finally the cadmium ion adsorbent hydrogel is dried to prepare the cadmium ion adsorbent. The invention also discloses applications of the cadmium ion adsorbent. The cadmium ion adsorbent can be easily separated from water, can efficiently absorb cadmium ions in water, and has a large cadmium adsorption capacity; after several times of application, a stable adsorption performance is stilled maintained; and the cadmium ion adsorbent can be used toprocess industrial wastewater and environmental water, which contain cadmium ions, and has a high application value.