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| Effects of co-application of biochar and iron-based materials on the removal of thiamethoxam in soil |
| Received:March 05, 2025 |
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| KeyWord:biochar;iron powder;thiamethoxam;bioavailability |
| Author Name | Affiliation | E-mail | | WANG Yudong | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | | | WANG Yan | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | | | HE Likun | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | | | WANG Yunxu | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | | | LIU Ruhai | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | ruhai@ouc.edu.cn | | ZHENG Hao | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | | | LI Fengmin | College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| Biochar is a soil conditioner, while iron-based materials contribute to the degradation of organic pollutants. This study aims to explore the effect and mechanism of the mixed application of biochar and iron-based materials on the degradation of thiamethoxam（TMX） in soil. Adsorption tests and soil simulation experiments were carried out to analyze the adsorption effect and degradation effect and mechanism of the combined application of biochar and iron-based materials on TMX. The results showed that straw biochar had a larger adsorption capacity and weaker adsorption strength than fruit shell biochar, which was more conducive to surface chemical reactions. Biochar alone could fix TMX in soil through strong adsorption and delay its degradation, while zero-valent iron significantly promoted the degradation of TMX, especially when mixed with straw biochar, the degradation rate reached 85.7%. The degradation of soil TMX was mainly chemical reaction, and the role of microorganisms was about 10%. The mixed application of biochar and iron-based materials significantly increased the activity of urease and catalase. In general, the combined application of biochar and iron-based materials can effectively improve the degradation efficiency of TMX. While improving soil properties, this mixed application showed good application potential in the control and remediation of TMX pollution in soil. |
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