CN-118598373-B - Preparation method and application of water body and soil restoration agent polluted by mesosulfuron-methyl herbicide

Abstract

The invention discloses a preparation method and application of a water body polluted by a sulfometuron-methyl herbicide and a soil restoration agent, and belongs to the technical field of pesticide pollution restoration materials in environmental protection. The preparation method comprises the steps of adding corn stalk powder into an aqueous solution containing ferric chloride hexahydrate, stirring and separating, drying a solidified substance to obtain a composite material precursor, reducing ferric iron by utilizing hydrogen or carbon monoxide generated by pyrolysis under a high-temperature anoxic condition through a carbothermic reduction method to enable the generated nanometer zero-valent iron to be loaded on the surface of biochar to obtain nanometer zero-valent iron modified biochar, fixing degradation bacteria fermentation liquor on the nanometer zero-valent iron modified biochar through a physical adsorption method, and freeze-drying to obtain the water body and soil restoration agent polluted by the sulfosulfuron-methyl herbicide. The repairing agent has larger specific surface area, high-efficiency adsorption performance and high reaction activity, and can realize the rapid, efficient and green repair of water and soil polluted by the sulfometuron-methyl herbicide.

Inventors

• PENG CHENG
• PAN YAN
• CHEN ANQI
• ZHANG WEI
• ZHAN XIUPING
• ZHAO LI
• WANG HAORAN
• XIE WENWEN
• LIU QIANG
• Shi Junzhu

Assignees

• 华东理工大学
• 上海市农业技术推广服务中心

Dates

Publication Date

20260512

Application Date

20240509

Claims (8)

1. 1. A preparation method of a water body and soil restoration agent polluted by a sulfometuron-methyl herbicide is characterized by comprising the following steps: adding corn stalk powder into an aqueous solution containing ferric chloride hexahydrate, stirring and separating, and drying a solidified substance to obtain a composite material precursor, reducing ferric iron by utilizing hydrogen or carbon monoxide generated by pyrolysis under a high-temperature anoxic condition through a carbothermic reduction method to enable the generated nanometer zero-valent iron to be loaded on the surface of biochar to obtain nanometer zero-valent iron modified biochar; The carbon thermal reduction method comprises pyrolyzing the composite material precursor in inert gas atmosphere at 700 ℃ for 2 hours, and cooling to room temperature to obtain nano zero-valent iron modified biochar; the degrading bacteria fermentation liquor is bacillus megaterium.
2. 2. The method for preparing the water body and soil remediation agent polluted by the metasulfuron-methyl herbicide as claimed in claim 1, wherein the preparation process of the composite material precursor is as follows: Washing and drying corn stalk powder with water, adding the corn stalk powder into an aqueous solution containing ferric chloride hexahydrate, fully stirring to obtain a suspension containing a solidified product, standing the suspension at room temperature for 24 hours, then centrifugally separating to obtain a lower solidified product, and drying the solidified product at 80 ℃ to obtain a composite material precursor.
3. 3. The method for preparing the water body and soil remediation agent polluted by the metasulfuron-methyl herbicide as claimed in claim 1, wherein the mass ratio of the corn stalk powder to the ferric chloride hexahydrate in the composite material precursor is 1:2.7.
4. 4. The method for preparing the water body and soil restoration agent polluted by the metasulfuron-methyl herbicide, which is disclosed in claim 1, is characterized in that the inert gas adopts nitrogen, the circulation speed is 80 mL/min, the heating speed during pyrolysis is 5 ℃/min, and the cooling speed during cooling is 10 ℃/min.
5. 5. The method for preparing the water body and soil remediation agent polluted by the metasulfuron-methyl herbicide as claimed in claim 1, wherein the particle size of the nano zero-valent iron modified biochar is 0.25-0.5 mm, the immobilization time of the degrading bacteria fermentation liquor is 26 hours, and the mass and volume ratio of the nano zero-valent iron modified biochar to the degrading bacteria fermentation liquor is 6%.
6. 6. The method for preparing the water body and soil restoration agent polluted by the metasulfuron-methyl herbicide as claimed in claim 1, wherein the physical adsorption method is to immerse the nano zero-valent iron modified biochar in a degrading bacterium fermentation broth, and oscillating and fixing the nano zero-valent iron modified biochar under the conditions of 30 ℃ and 150 rpm.
7. 7. A water body and soil remediation agent polluted by the mesosulfuron-methyl herbicide obtained by the preparation method according to any one of claims 1 to 6.
8. 8. Use of the mesosulfuron-methyl herbicide-polluted water and soil restoration agent according to claim 7 for restoration of water and soil polluted by mesosulfuron-methyl herbicide.

Description

Preparation method and application of water body and soil restoration agent polluted by mesosulfuron-methyl herbicide Technical Field The invention belongs to the technical field of pesticide pollution repair materials in environmental protection, and particularly relates to a preparation method and application of a water body and soil repair agent polluted by an azosulfuron-methyl herbicide, in particular to repair of the water body and soil polluted by the azosulfuron-methyl herbicide. Background The sulfometuron-methyl is a biocidal herbicide, and is mainly used for weeding non-cultivated lands such as various forest lands, barren lands, forest fire belts and the like and orchards such as deep root fruit trees and the like. The sulfometuron-methyl can effectively prevent and remove monocotyledonous plants, dicotyledonous plants and shrubs, and has the characteristics of good systemic property, wide weeding range, long lasting period and the like. However, improper use of sulfometuron may cause phytotoxicity, affect crop growth, and even lead to failure of normal planting of farmlands within one to two years. Studies have shown that the sulfometuron-methyl can cause the growth indexes such as plant height, spike length, grain size and the like of corn plants to be inhibited, the low-concentration sulfometuron-methyl can have adverse effects on root systems and tubers of potatoes, the abnormal growth or function damage can be caused, and the high-concentration sulfometuron-methyl can cause the number of abnormal tubers of the potatoes to be obviously increased. The biochar is a carbon-rich substance prepared by taking biomass as a raw material through anaerobic high-temperature pyrolysis, and has strong adsorption capacity on organic and inorganic pollutants due to rich surface functional groups, aromaticity and surface negative charge. However, the biochar is difficult to thoroughly degrade organic pollutants and has the characteristic of secondary pollution. The nano zero-valent iron (nZVI) can effectively remove organic pollutants according to the oxidation-reduction characteristics, but nano zero-valent iron particles are agglomerated and are easy to oxidize, so that the reactivity is reduced, and the environmental toxicity exists when the addition amount is too large. On the other hand, degradation of herbicides by the microbial co-metabolic pathway is attracting attention, however, the microbial restoration effect is susceptible to environmental factors and the restoration effect is unstable. Therefore, the nano zero-valent iron modified biochar composite microbial agent not only improves the degradation effect on the sulfometuron-methyl, but also reduces the agglomeration tendency of the nano zero-valent iron, strengthens the reactivity of the nano zero-valent iron, also serves as a carrier to bear microorganisms and strengthen the activity of the nano zero-valent iron modified biochar composite microbial agent, and improves the adsorption performance and pollutant removal capability of the biochar to a greater extent. Currently, some researchers have explored and studied related materials as follows: (1) The invention can effectively realize solidification and stabilization of lead, reduce the severity of environmental conditions required by traditional microorganisms, simultaneously reduce the generation cost, facilitate the high-value utilization of corn straw, and have wide industrialized prospect and market value. (2) CN201811481389.0 discloses a method for repairing petroleum polluted soil by using biochar loaded surfactant coupled with microorganism plants, which adopts an in-situ repair technology, does not damage the environment in the repair process, does not bring secondary pollution, is green and environment-friendly, and realizes a composite repair mode with good green cycle repair effect. (3) AU2020103433 (A4) discloses a method for preparing magnetic biochar by utilizing kitchen waste, which reduces environmental hazard and obtains good social benefit and environmental benefit by recycling the kitchen waste. (4) CN202210741637.0 discloses a preparation method and application of a straw biochar loaded nano zero-valent iron material, and the preparation method has the advantages of low cost, good adsorption performance, difficult agglomeration, high removal efficiency, simple process flow, convenient operation and the like, and can be applied to in-situ restoration or pumping treatment of heavy metal lead and novel organic pollutant sulfamethoxazole composite pollution. (5) CN202210405459.4 discloses a preparation method of magnetic sludge biochar which can be applied to activating peroxymonosulfate to efficiently degrade sulfamethoxazole, can realize the efficient degradation of sulfamethoxazole in water, and has stronger magnetic property to realize the recycling. (6) CN201611259617.0 discloses a corn stalk biochar and use of the same for adsorbing herbicide, the corn stalk biochar ha