Application and method of modified bagasse in adsorbing organophosphorus pesticides and / or polycyclic aromatic hydrocarbons pollutants

Abstract

This invention discloses the application and method of modified sugarcane bagasse in the adsorption of organophosphorus pesticides and / or polycyclic aromatic hydrocarbons (PAHs). The modified sugarcane bagasse is used as an adsorbent to simultaneously adsorb organophosphorus pesticides and PAHs in aqueous solutions. By modifying waste sugarcane bagasse with nitric acid, the simultaneous, efficient, economical, and environmentally friendly adsorption of organophosphorus pesticides and PAHs in aqueous solutions is achieved. This invention turns waste into treasure, promoting the high-value utilization of solid waste; it enables the simultaneous, rapid, and efficient removal of polar organophosphorus pesticides and aromatic PAHs from the aquatic environment, protecting the environment and safeguarding human health.

Description

Technical Field

[0001] This invention relates to the application and method of modified sugarcane bagasse in adsorbing organophosphorus pesticides and / or polycyclic aromatic hydrocarbon pollutants. Background Technology

[0002] As humans squander Earth's resources and continuously generate waste, more and more pollutants are being released into the environment. Pollutants in aquatic environments can be transferred to animals through environmental migration and the food chain, and they have teratogenic, carcinogenic, mutagenic, and bioaccumulative effects, thus harming human health. Therefore, controlling the levels of pollutants in aquatic environments is crucial for protecting the environment and safeguarding human health.

[0003] Organophosphorus pesticides are a class of pesticides widely used in my country. Most organophosphorus pesticides can cause acute toxicity, and long-term low-dose exposure to certain organophosphorus pesticides can cause teratogenicity, carcinogenicity, and mutagenicity. Polycyclic aromatic hydrocarbons (PAHs) are among the earliest and most numerous chemical carcinogens and are major representatives of persistent organic pollutants in the natural environment. Their harm to human health mainly includes strong chemical carcinogenicity and phototoxicity.

[0004] Currently, common technologies for removing organic pollutants from water bodies include adsorption, oxidation-reduction, biodegradation, and membrane separation. Adsorption has unparalleled advantages over other methods in treating low-concentration pollutants, such as being environmentally friendly, economical, and efficient. However, the high manufacturing cost limits the widespread application of traditional adsorbents such as activated carbon in treating pollutants in the aquatic environment.

[0005] CN202010642090.X discloses a modified sugarcane bagasse retarder and its preparation method. The specific method is as follows: First, sugarcane bagasse is pretreated with sulfite or chlorite to remove lignin and some hemicellulose; then, it is acidified with a composite acid under catalytic conditions. The prepared retarder contains not only hydroxyl and carboxyl groups, but also functional groups such as phosphate groups. Under both room temperature (20℃) and high temperature (50℃) conditions, the retarding effect of the modified sugarcane bagasse retarder is superior to that of sodium gluconate, and it has no effect on the later-stage strength of concrete. Compared with traditional retarders such as sodium gluconate, the modified sugarcane bagasse retarder has advantages such as low cost, environmental friendliness, renewability, and simple production process.

[0006] CN202011184502.6 discloses a method for preparing a modified sugarcane bagasse cellulose-based composite adsorbent, belonging to the field of wastewater treatment, and particularly relating to the removal of heavy metal ions from wastewater. This invention utilizes modified porous calcium carbonate from sugarcane bagasse as raw material, ammonium persulfate as an initiator, N,N-methylenebisacrylamide as a crosslinking agent, and acrylic acid and acrylamide as grafting monomers to prepare a sugarcane bagasse cellulose-based composite Pb using a reverse emulsion method. 2+ Adsorbent for Pb in wastewater2+ Removal. This adsorbent is effective against Pb. 2+ It has a good removal effect, with a maximum adsorption capacity of 110mg / g, and has an effective regeneration ability, which can still reach 85mg / g after 10 cycles.

[0007] CN202010419172.8 discloses a method for preparing modified sugarcane bagasse, which involves sequentially pretreating, esterifying, and magnetizing sugarcane bagasse. In the esterification reaction, organic acids are grafted onto the surface of the pretreated sugarcane bagasse, and new carboxyl functional groups are introduced, increasing the adsorption capacity for metal ions. During the magnetization reaction, Fe3O4 particles are introduced onto the surface of the esterified sugarcane bagasse, enhancing its structural stability and facilitating separation from complex systems through magnetism. This invention also provides modified sugarcane bagasse obtained by the aforementioned method, which improves the structure of the sugarcane bagasse and enhances its adsorption capacity for heavy metal ions.

[0008] CN201610455294.6 provides a method for preparing a modified sugarcane bagasse adsorbent, comprising the following steps: 1) drying and pulverizing sugarcane bagasse to obtain sugarcane bagasse powder; 2) mixing the sugarcane bagasse powder with a silica solution, simultaneously introducing nitrogen gas, then adding cerium ammonium nitrate and methyl acrylate for a graft copolymerization reaction, adding hydroquinone to stop the reaction, filtering, washing the filter cake with acetone, and drying to obtain the graft copolymer; 3) adding sodium hydroxide solution to the dried graft copolymer, performing saponification treatment at 60–70°C, ultrasonic waves at 50,000–100,000 Hz and 200–500 MPa for 10–15 h, cooling, adjusting the pH to 6–7, filtering, washing the filter cake with acetone, and drying to obtain the modified sugarcane bagasse adsorbent. This invention also provides the above-mentioned modified sugarcane bagasse adsorbent and its application as a heavy metal adsorbent.

[0009] It is evident that the above methods are mainly used for the adsorption of heavy metals, and the modification methods are complex. The more complex the modification method, the more environmental factors are introduced. While adsorbing harmful substances, the environmental impact of the waste adsorbent is also quite complex. Summary of the Invention

[0010] The main objective of this invention is to provide the application of modified sugarcane bagasse in the adsorption of organophosphorus pesticides and / or polycyclic aromatic hydrocarbon pollutants. The preparation method of the modified sugarcane bagasse includes the following steps:

[0011] Step 1: Soak sugarcane bagasse in a 5-10% nitric acid solution for 30-120 minutes. After removing it, boil it in water for 45-60 minutes. Then wash it with water several times until it is neutral to 6-7.

[0012] Step 2: The washed bagasse is placed in a drying oven at 60-80℃ and dried overnight. The dried bagasse is then crushed and passed through an 80-160 mesh sieve to obtain the modified bagasse.

[0013] Furthermore, 1g of sugarcane bagasse is soaked in 350mL-450mL of nitric acid solution with a mass fraction of 5-10% by stirring.

[0014] The organophosphorus pesticides described in this invention include at least one of the following: trichlorfon, dichlorvos, dimethoate, malathion, phoxim, chlorpyrifos, demeton-methyl, parathion, phorate, and phorate. Methyl parathion is further preferred.

[0015] The polycyclic aromatic hydrocarbon (PAH) pollutants described in this invention include at least one of the following: acenaphthene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, indo[1,2,3-c,d]pyrene, dibenzo[a,h]anthracene, and benzo[g,h,i]perylene. Naphthalene is further preferred.

[0016] Another object of the present invention is to provide a method for modifying sugarcane bagasse to adsorb organophosphorus pesticides and / or polycyclic aromatic hydrocarbon pollutants, wherein the method for preparing the modified sugarcane bagasse includes the following steps:

[0017] Step 1: Soak sugarcane bagasse in a 5-10% nitric acid solution for 30-120 minutes, then boil it in water for 45-60 minutes, and then wash it with water several times until it is neutral to 6-7. Step 2: Place the washed bagasse in a drying oven at 60-80℃ overnight to dry it. After drying, crush the bagasse and pass it through an 80-160 mesh sieve to obtain the modified bagasse.

[0018] The method involves adding the prepared modified sugarcane bagasse into the liquid to be treated.

[0019] Furthermore, the pH of the solution to be treated is 4-5.

[0020] Furthermore, the temperature of the liquid to be treated is 30℃-40℃.

[0021] Furthermore, the content of organophosphorus pesticides and / or polycyclic aromatic hydrocarbon pollutants in the liquid to be treated is 0.1-50 mg / L.

[0022] Furthermore, the adsorption time is 5 min to 1440 min. Preferably, it is 5 min to 60 min, for example, an integer within the range of 5 min to 60 min.

[0023] Furthermore, the amount of modified bagasse added is 1.25 g / L to 40 g / L. Preferably, it is 2 g / L to 10 g / L, for example, an integer from 2 g / L to 10 g / L.

[0024] Compared with the prior art, this technical solution has the following advantages:

[0025] Economic benefits: Sugarcane bagasse is widely available and inexpensive.

[0026] Environmental benefits: The sugarcane bagasse modification and preparation process is green and environmentally friendly, with no secondary pollution sources introduced; turning waste into treasure alleviates environmental pressure, protects the water environment, and safeguards human health.

[0027] Social benefits: The preparation is simple and easy to operate, and easy to promote; the high-value utilization of waste relieves environmental pressure and promotes carbon sequestration in agriculture; it makes efforts to achieve carbon neutrality and has certain social benefits.

[0028] This invention enables the simultaneous and rapid removal of organophosphorus pesticides and polyaromatic hydrocarbons from the aquatic environment. At pH 4.5 and a modified sugarcane bagasse dosage of 7.5 g / L, the removal rates of methyl parathion and naphthalene are both greater than 90%. The optimal temperature is 35℃, and a removal rate of over 90% for methyl parathion and naphthalene can be achieved within 10 minutes. This invention reveals that the adsorption mechanism of modified sugarcane bagasse for naphthalene is completely different from that of methyl parathion, and it demonstrates good effectiveness in simultaneously removing methyl parathion and naphthalene pollutants from the aquatic environment. It can also be applied to the treatment of various other pollutants, thus showing broad prospects in wastewater treatment. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 A comparison of the adsorption effects of different adsorbents on methyl parathion (a) and naphthalene (b).

[0031] Figure 2 Effect of dosage on the adsorption of methyl parathion (a) and naphthalene (b) by modified bagasse.

[0032] Figure 3 Effect of adsorption time on the adsorption of methyl parathion (a) and naphthalene (b) by modified bagasse.

[0033] Figure 4 Fitting the first-order kinetic equations for the adsorption of methyl parathion (a) and naphthalene (b) from modified bagasse.

[0034] Figure 5 Fitting the second-order kinetic equations for the adsorption of methyl parathion (a) and naphthalene (b) from modified bagasse.

[0035] Figure 6 Adsorption capacity of modified bagasse particles in methyl parathion (a) and naphthalene (b) at different concentrations.

[0036] Figure 7 Langmuir isotherms for the adsorption of methyl parathion (a) and naphthalene (b) on modified bagasse.

[0037] Figure 8Freundlich isotherms for the adsorption of methyl parathion (a) and naphthalene (b) on modified bagasse.

[0038] Figure 9 The diagram shows the competitive adsorption of methyl parathion (a) and naphthalene (b) on modified bagasse. Detailed Implementation

[0039] Example 1

[0040] Preparation method of modified sugarcane bagasse: After juicing sugarcane, the bagasse is soaked in a 5% nitric acid solution for 30 minutes, with each 1g of bagasse soaked in 400mL of 5% nitric acid solution with stirring. After removal, it is boiled in distilled water for 45 minutes (400mL of distilled water), then washed repeatedly with deionized water until neutral, and dried overnight in an 80℃ drying oven. The dried bagasse is then pulverized and passed through an 80-mesh sieve and sealed for storage.

[0041] Example 2

[0042] 10 mL of a 2 mg / L naphthalene / 10 mg / L methyl parathion aqueous solution was added to a solution containing 0.05 g of different types of adsorbent algae particles, modified bagasse prepared in Example 1, chitosan / sodium alginate microbeads, chitosan / oyster shell powder microbeads, and modified oyster shell powder. The pH was adjusted using NaOH or HCl at 25°C, with pH values ​​of 3.6, 4.5, 6.86, and 8.0, respectively. The solution was then heated at 180 rpm. -1 Shake in a shaker for 1 hour, then take samples for analysis.

[0043] Methyl parathion:

[0044] Sample pretreatment method: After the adsorption experiment was completed, the sample was removed and centrifuged at high speed. The supernatant (water sample) was placed in a separatory funnel and extracted twice with dichloromethane (10 mL each time). The mixture was shaken for 5 min, allowed to stand for separation, and the dichloromethane layers were combined. The extract was evaporated to dryness, and 1.0 mL of acetone was added to dissolve the residue. Finally, 1.0 μL of this solution was injected into a gas chromatograph for analysis.

[0045] The gas chromatography detection conditions were as follows: detector and injection port temperatures were both 250℃, splitless operation, and the column temperature was programmed with an initial temperature of 80℃, held for 2 min, then increased to 250℃ at a rate of 20℃ per minute and held for 4 min. Nitrogen was used as the carrier gas at a flow rate of 60 mL / min, hydrogen at 75.0 mL / min, and air at 100 mL / min, with an injection volume of 1.0 μL.

[0046] Naphthalene:

[0047] Sample pretreatment method: After the adsorption experiment was completed, the sample was removed and centrifuged at high speed. The supernatant (water sample) was placed in a separatory funnel and extracted twice with dichloromethane, 10 mL of dichloromethane each time. The mixture was shaken for 5 min, allowed to stand for separation, and the dichloromethane layers were combined. The extract was then blown with nitrogen to a final volume of 0.1 mL, and acetonitrile replacement solution was added to a final volume of 1.0 mL and vortexed to mix. Finally, 5.0 μL of this solution was injected into high-performance liquid chromatography for analysis.

[0048] Reference conditions for liquid chromatography: Thermo hypersil green PAH column (4.6 mm × 150 mm, 5 μm); column temperature: 30 ℃; flow rate: 0.5 mL / min; injection volume: 5 μL; mobile phase: A is ultrapure water, B is acetonitrile; gradient elution program is shown in Table 1.

[0049] Table 1 Mobile phase and gradient elution program

[0050]

[0051] Materials from different sources have significantly different chemical compositions, and differences in their chemical structure and functional groups have a significant impact on adsorption efficiency. Figure 1 As can be seen from (a), the pH value of the solution has a certain influence on its adsorption effect. However, the removal rate of different materials is slightly different at different pH values. The overall order is roughly as follows: modified sugarcane bagasse > algae particles > oyster shell powder, chitosan / oyster shell powder microbeads > chitosan / sodium alginate microbeads. The highest adsorption efficiency is achieved by the modified sugarcane bagasse prepared in Example 1, and the lowest is achieved by the chitosan / sodium alginate microbeads.

[0052] from Figure 1 As can be seen from (b), the pH value of the solution has a smaller effect on the adsorption effect of naphthalene than that of methyl parathion. The overall ranking of the adsorption effect under various pH conditions is approximately as follows: modified bagasse > algae particles > chitosan / sodium alginate microspheres > chitosan / oyster shell powder microspheres. Among them, the bagasse particles prepared in Example 1 have the highest adsorption efficiency, while the chitosan / oyster shell powder microspheres have the lowest.

[0053] Example 3

[0054] Add the modified sugarcane bagasse prepared according to Example 1 to a centrifuge tube, prepare 10 mL of an aqueous solution of 2 mg / L naphthalene and 10 mg / L methyl parathion, adjust the pH value with NaOH or HCl, and investigate the effects at pH 3–8, temperature 25℃–45℃, modified sugarcane bagasse dosage 0.015 g–0.40 g, and 180 r·min. -1 Shake in a shaker for 1 hour, then take a sample to analyze the concentration.

[0055] The optimal adsorption conditions were determined through experiments: at pH 4.5 and a modified sugarcane bagasse dosage of 7.5 g / L, the removal rates of methyl parathion and naphthalene were both greater than 90% (see [link to experiment]). Figure 2 The optimal temperature is 35℃.

[0056] Example 4:

[0057] 10 mL of a 10 mg / L methyl parathion aqueous solution (pH 4.50) was added, along with 0.05 g of the modified sugarcane bagasse prepared according to the method in Example 1. The mixture was then incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker, and two parallel samples were set up for each sample. Samples were taken at 5 min, 10 min, 30 min, 60 min, 2 h, 4 h, 6 h, 8 h, 15 h and 24 h respectively to examine the adsorption time and fit the kinetic model.

[0058] 10 mL of a 2 mg / L naphthalene aqueous solution (pH 4.50) was added, along with 0.025 g of the modified sugarcane bagasse prepared according to the method in Example 1. The mixture was then incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker, and two parallel samples were set up for each sample. Samples were taken at 10 min, 30 min, 60 min, 2 h, 4 h, 6 h, 8 h, 15 h and 24 h respectively to examine the adsorption time and fit the kinetic model.

[0059] from Figure 3 It can be seen that the removal rates of methyl parathion and naphthalene can both exceed 90% within 10 minutes. Then, pseudo-first-order and pseudo-second-order kinetic models were used to analyze the adsorption data of methyl parathion and naphthalene on bagasse particles. Based on the fitting results (Figure...), Figure 4 Analysis of the parameters (Table 2) shows that the first-order kinetic fit is poor, with correlation coefficients of 0.2593 for methyl parathion and 0.7221 for naphthalene. Furthermore, the q calculated using the pseudo-first-order kinetic equation is also poor. e The value and the actual measured q exp The values ​​differ significantly (methyl parathion q) e and q exp The values ​​are 10.7 and 0.937 respectively, naphthalene q e and q exp The correlation coefficients (0.00792 and 0.798 respectively) indicate that the adsorption and removal of methyl parathion and naphthalene by bagasse particles do not conform to the pseudo-first-order kinetic model. Although the pseudo-first-order kinetic equation is widely used in various adsorption processes, it is only suitable for describing the adsorption rate in the initial stage and cannot accurately describe the entire adsorption process. The correlation coefficients of the pseudo-second-order kinetic model are significantly higher than those of the pseudo-first-order kinetic simulation, with 0.99993 for methyl parathion and as high as 0.99999 for naphthalene (see...). Figure 5 Furthermore, the adsorption amount calculated by the pseudo-second-order kinetic model is very close to the theoretical value (as shown in Table 3, methyl parathion q). e and q expThe values ​​were 0.919 and 0.937 respectively, for naphthalene q. e and q exp The values ​​are 0.797 and 0.798 respectively. Therefore, the adsorption process of methyl parathion by bagasse particles is more consistent with the pseudo-second-order kinetic model, and the fitting effect is better. It is therefore speculated that the adsorption of methyl parathion and naphthalene by bagasse may be mainly controlled by chemisorption.

[0060] Table 2. First-order kinetic parameters of modified bagasse adsorption of methyl parathion and naphthalene

[0061]

[0062] Table 3 Second-order kinetic parameters of modified bagasse adsorption of methyl parathion and naphthalene

[0063]

[0064] Example 5:

[0065] Methyl parathion solutions with concentrations of 0.5, 1, 5, 10, 20, 40, and 50 mg / L were prepared, with a pH of 4.50. 0.05 g of the modified sugarcane bagasse prepared according to the method of Example 1 was placed in the aqueous solution and incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker for 1 hour, then analyzed. The Langmuir and Freundlich models were used for model fitting.

[0066] Naphthalene solutions with concentrations of 0.1, 0.25, 0.5, 1, 2, and 5 mg / L were prepared, with a pH of 4.50. 0.025 g of the modified sugarcane bagasse prepared according to the method in Example 1 was placed in the aqueous solution and incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker for 1 hour, then analyzed. The Langmuir and Freundlich models were used for model fitting.

[0067] To investigate the removal efficiency of modified bagasse particles in aqueous solutions of methyl parathion and naphthalene at different concentrations, from... Figure 6The following conclusions can be drawn: Within the investigated concentration range, the adsorption capacity of modified bagasse particles increased to varying degrees with the increase of methyl parathion and naphthalene concentrations. This is because the higher the concentration of methyl parathion and naphthalene, the stronger the diffusion driving force of their molecules, making them easier to diffuse to the surface of the modified bagasse particles and more frequently collide with the adsorption sites on the adsorbent surface. Thus, the adsorption capacity of modified bagasse particles for methyl parathion and naphthalene also increases. When the concentration of methyl parathion is 40 mg / L, the adsorption rate decreases, possibly because the adsorbent lacks binding sites at higher concentrations of methyl parathion. At a concentration of 50 mg / L, the removal rate of methyl parathion reaches 81.2%, and the adsorption capacity is 4.53 mg / g. The adsorption rate of naphthalene remains high within the investigated concentration range. At a concentration of 5 mg / L, the removal rate of naphthalene reaches 93.8%, and the adsorption capacity is 1.98 mg / g, indicating that modified bagasse can effectively remove methyl parathion and naphthalene from aqueous solutions.

[0068] This experiment analyzed the adsorption and removal process of methyl parathion and naphthalene by bagasse particles using both the Langmuir and Freundlich isotherm models. The Langmuir equation assumes that the adsorbent has a certain number of adsorption sites, each of which can only adsorb one molecule. At low solution concentrations, adsorption is linear. As the concentration increases, the adsorption sites reach saturation, the adsorbent surface is covered by a monolayer, and adsorption ceases. The fitting results of the Langmuir equation are shown in [Figure number missing]. Figure 7 And Table 4. According to the Langmuir fitting results of bagasse on methyl parathion and naphthalene, the linearity of the fit was poor, with linear correlation coefficients of 0.886 and 0.640 for methyl parathion and naphthalene, respectively. Furthermore, based on the q calculated after fitting... m Value and actual q m The significant difference in values ​​indicates that the adsorption of methyl parathion and naphthalene by bagasse particles is not a monolayer adsorption. l The higher the value, the greater the affinity of the adsorbent for the analyte. As can be seen from the table, the affinity for naphthalene is greater than that for methyl parathion.

[0069] The experimental results show that the isotherms fitted using the Freundlich model have a good linear relationship. Figure 8 The correlation coefficients r for methyl parathion and naphthalene were 0.990 and 0.974, respectively, reaching a significant level (P≤5%). n in the equation is a parameter characterizing the interaction strength between the molecules of the adsorbed substance and the adsorbent. The n values ​​for the adsorption of methyl parathion and naphthalene by bagasse were both greater than 1 (see Table 5), indicating that the process of adsorbing methyl parathion and naphthalene by modified bagasse is easy to carry out.

[0070] Table 4. Langmuir model parameters for the adsorption of methyl parathion and naphthalene by modified bagasse.

[0071]

[0072] Table 5. Freundlich model parameters for the adsorption of methyl parathion and naphthalene by modified sugarcane bagasse.

[0073]

[0074]

[0075] Example 6:

[0076] 10 mL of a mixed aqueous solution of 10 mg / L methyl parathion and 2 mg / L naphthalene, pH 4.50, was prepared. 0.05 g of the modified sugarcane bagasse prepared according to the method in Example 1 was added to the solution, and the mixture was incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker, and two parallel samples were prepared for each sample. Samples were taken at 5 min, 10 min, 30 min, 60 min, 2 h, 4 h, 6 h, 8 h, 15 h and 24 h for pretreatment and then detected by gas chromatography.

[0077] 10 mL of a mixed aqueous solution of 10 mg / L methyl parathion and 2 mg / L naphthalene was added, along with 0.025 g of the modified sugarcane bagasse prepared according to the method in Example 1. The mixture was incubated at 25°C and 180 rpm. -1 The sample was shaken in a shaker, and two parallel samples were prepared for each sample. Samples were taken at 10 min, 30 min, 60 min, 2 h, 4 h, 6 h, 8 h, 15 h and 24 h for pretreatment and then detected by liquid chromatography.

[0078] A certain concentration of methyl parathion and naphthalene were simultaneously added to an aqueous solution to investigate the potential interference of their coexistence on adsorption. Figure 9 It can be seen that it can quickly reach adsorption equilibrium. The coexistence of naphthalene caused a slight decrease in the adsorption of methyl parathion after 8 hours, which should be due to competition for adsorption sites. The coexistence of methyl parathion has almost no effect on the adsorption of naphthalene. Therefore, it can be inferred that the adsorption mechanism of modified bagasse for naphthalene is completely different from that of methyl parathion, and it has a good effect on cleaning up methyl parathion and naphthalene pollutants in the water environment at the same time.

[0079] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. The application of modified sugarcane bagasse in the simultaneous adsorption of organophosphorus pesticides and polycyclic aromatic hydrocarbon pollutants, characterized in that, The organophosphorus pesticide is methyl parathion, and the polycyclic aromatic hydrocarbon pollutant is naphthalene; the preparation method of the modified sugarcane bagasse includes the following steps: Step 1: Soak sugarcane bagasse in a 5-10% nitric acid solution for 30-120 minutes. After removing it, boil it in water for 45-60 minutes, and then wash it with water several times until it is neutral. Step 2: The washed bagasse is placed in a drying oven at 60-80℃ and dried overnight. The dried bagasse is then crushed and passed through an 80-160 mesh sieve to obtain the modified bagasse.

2. The application according to claim 1, characterized in that: Soak 1g of sugarcane bagasse in 350mL-450mL of a 5-10% nitric acid solution by stirring.

3. A method for simultaneously adsorbing organophosphorus pesticides and polycyclic aromatic hydrocarbon pollutants from modified sugarcane bagasse, characterized in that: The method for preparing the modified sugarcane bagasse includes the following steps: Step 1: Soak sugarcane bagasse in a 5-10% nitric acid solution for 30-120 minutes, then boil it in water for 45-60 minutes, and then wash it with water several times until it is neutral. Step 2: Place the washed bagasse in a drying oven at 60-80℃ overnight to dry it. After drying, crush the bagasse and pass it through an 80-160 mesh sieve to obtain the modified bagasse. The method for simultaneously adsorbing organophosphorus pesticides and polycyclic aromatic hydrocarbon pollutants from modified sugarcane bagasse includes adding the prepared modified sugarcane bagasse into the liquid to be treated; the organophosphorus pesticide is methyl parathion, and the polycyclic aromatic hydrocarbon pollutant is naphthalene.

4. The method according to claim 3, characterized in that: The pH of the solution to be treated is 4-5.

5. The method according to claim 3, characterized in that: The temperature of the liquid to be treated is 30℃-40℃.

6. The method according to claim 3, characterized in that: The concentrations of organophosphorus pesticides and polycyclic aromatic hydrocarbons in the liquid to be treated range from 0.1 mg / L to 50 mg / L.

7. The method according to any one of claims 3-6, characterized in that: The adsorption time ranged from 5 min to 1440 min.

8. The method according to any one of claims 3-6, characterized in that: The amount of modified sugarcane bagasse added is 1.25g / L-40g / L.

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