CN-122007140-A - Method for relieving toxicity of microplastic to soil-plant system based on combination of nitrification inhibitor and carbon nanomaterial

Abstract

The invention belongs to the field of soil pollution treatment, and relates to a method for relieving toxicity of microplastic to a soil-plant system based on combination of nitrification inhibitor and carbon nanomaterial. The method comprises the step of applying a nitrification inhibitor and a carbon nanomaterial to soil in which plants are planted, wherein the nitrification inhibitor is DMPP, and the carbon nanomaterial is one or more of multi-wall carbon nanotubes and nanodiamonds. The method can technically slow down the pollution of the microplastic, improve the soil health and ensure the quality safety of agricultural products.

Inventors

• ZHANG MANYUN
• MA BIN
• WANG YUXIANG
• LIU YING

Assignees

• 扬州大学

Dates

Publication Date

20260512

Application Date

20260324

Claims (10)

1. 1. A method for relieving toxicity of micro plastics to soil-plant systems based on combination of nitrification inhibitor and carbon nanomaterial is characterized by comprising the step of applying the nitrification inhibitor and the carbon nanomaterial to soil in which plants are planted, wherein the nitrification inhibitor is DMPP, and the carbon nanomaterial is one or more of multi-wall carbon nanotubes and nanodiamonds.
2. 2. The method for reducing toxicity of microplastic to soil-plant systems based on nitrification inhibitor-carbon nanomaterial combination as claimed in claim 1, wherein said microplastic is polyvinyl chloride.
3. 3. The method for reducing toxicity of microplastic to soil-plant systems based on nitrification inhibitor-carbon nanomaterial combination as claimed in claim 1, wherein a fertilizer is applied in the soil, said fertilizer comprising urea, trisodium phosphate and potassium chloride.
4. 4. The method for reducing toxicity of microplastic to soil-plant systems based on nitrification inhibitor-carbon nanomaterial combination as claimed in claim 3, wherein the application ratio of urea, trisodium phosphate and potassium chloride is 2:1:1.
5. 5. The method for reducing toxicity of microplastic to soil-plant systems based on nitrification inhibitor-carbon nanomaterial combination as claimed in claim 4, wherein the urea is applied in an amount of 200 mg N kg -1 dry soil.
6. 6. The use of the method for reducing toxicity of microplastic to soil-plant system based on nitrification inhibitor-carbon nanomaterial combination as claimed in any one of claims 1 to 5 for promoting plant growth.
7. 7. The use according to claim 6, wherein the plant is chinese cabbage.
8. 8. The use of the method for reducing toxicity of microplastic to soil-plant system based on nitrification inhibitor-carbon nanomaterial combination as claimed in any one of claims 1 to 5 in soil remediation.
9. 9. The use of the method for reducing the toxicity of microplastic to soil-plant systems based on the combination of nitrification inhibitor-carbon nanomaterial as claimed in any one of claims 1 to 5 for reducing the nitrate content of plants.
10. 10. The use of the method for reducing the toxicity of microplastic to soil-plant systems based on the combination of nitrification inhibitor-carbon nanomaterial as claimed in any one of claims 1 to 5 for reducing the nitrate nitrogen content of soil.

Description

Method for relieving toxicity of microplastic to soil-plant system based on combination of nitrification inhibitor and carbon nanomaterial Technical Field The invention belongs to the field of soil pollution treatment, and relates to a method for relieving toxicity of microplastic to a soil-plant system based on combination of nitrification inhibitor and carbon nanomaterial. Background The main sources of the microplastic in the farmland soil are agricultural mulch residues, and the main components are polyvinyl chloride, polystyrene and the like. The concentration of phthalate in soil covered by the plastic film in China is 74% -208% higher than that of soil not covered by the plastic film. Plastic mulch film mulching compromises the soil environment by releasing harmful contaminants such as phthalate salts. Microplastic may affect soil quality, including soil pH and carbon nitrogen phosphorus recycling processes. For example, higher concentrations of microplastic inhibit the decomposition of dissolved organics, which enriches the soil. However, the microplastic may react with the pesticide in the soil, accelerating the decomposition of the dissolved nitrogen and phosphorus nutrients, thereby reducing the soil nutrient content. In addition, microplastics can reduce the soil adsorption capacity and promote the flow of other contaminants in the soil. Microplastic can interfere with the activity of enzymes involved in nitrogen recycling (e.g., chitinase and leucine aminopeptidase), thereby affecting the soil nitrogen recycling process. The direct influence of the microplastic on the plant is reflected in the aspects of blocking the input of root nutrients, affecting photosynthesis and the like. Microplastic affects plant growth indirectly through its own toxicity by disrupting the plant's antioxidant enzyme system. The soil productivity change caused by the microplastic can also indirectly regulate plant growth. These multiple effects pose significant challenges for the protection of sustainable agriculture and ecosystem functions. However, there are still a number of limitations to the current remediation technology for microplastic pollution. High physical eliminating cost, difficult complete physical eliminating, easy chemical degradation, secondary pollution, long bioremediation period and low efficiency. Especially in agricultural soil, a green color control technology which can effectively relieve the toxicity of the microplastic and does not influence the quality of crops and the health of the soil is not yet available. The existing researches show that although the single use of the carbon nano material can improve the soil performance, the problems of reduced diversity of endophytes and the like possibly occur, and no related research on the nitrification inhibitor which is used for coping with plant growth under the stress of micro plastics alone or in combination with the carbon nano material exists up to the present. Therefore, development of a compound regulation strategy with strong synergy and high safety and suitable for farmland systems is needed. Thus, there is a need to provide a low cost, non-toxic method of combined mitigation of microplastic toxicity to soil-plant systems. Disclosure of Invention The invention aims to explore biological and environmental mechanisms of the nitrification inhibitor and the carbon nanomaterial acting in soil alone and in combination. The method is important to improve plant biomass and quality, improve microbial environment and realize sustainable restoration of soil pollution. The method can slow down the pollution of the microplastic, improve the soil health and ensure the quality safety of agricultural products, and provides a novel efficient sustainable soil restoration strategy. The technical scheme provided by the invention is as follows: a method for relieving toxicity of micro-plastics to soil-plant systems based on combination of nitrification inhibitor and carbon nano-materials comprises the step of applying the nitrification inhibitor and the carbon nano-materials to soil where plants are planted, wherein the nitrification inhibitor is DMPP, and the carbon nano-materials are one or more of multi-wall carbon nano-tubes and nano-diamond. Further, the microplastic is polyvinyl chloride. Further, fertilizers are applied to the soil, including urea, trisodium phosphate, and potassium chloride. Further, the application ratio of urea, trisodium phosphate and potassium chloride is 2:1:1. Further, the urea was applied in an amount of 200 mg N kg -1 dry soil. The invention also provides application of the method for relieving toxicity of the microplastic to soil-plant systems based on the nitrification inhibitor-carbon nanomaterial combination in promoting plant growth. Further, the plant is a chinese cabbage. The invention also provides application of the method for relieving toxicity of the microplastic to the soil-plant system based on the nitrification