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| Oxidative degradation of 2, 4-D in water by Fe/Co bimetallic nanocomposite-activated peroxymonosulfate |
| Received:March 27, 2023 |
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| KeyWord:2,4-dichlorophenoxyacetic acid(2, 4-D);nano zero-valent iron;bimetal;peroxymonosulfate;radical |
| Author Name | Affiliation | E-mail | | ZHANG Rong | Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | LUO Xinyu | Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences(Beijing), Beijing 100083, China
Ministry of Education Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences(Beijing), Beijing 100083, China | | | YANG Qi | Beijing Key Laboratory of Water Resources & Environmental Engineering, China University of Geosciences(Beijing), Beijing 100083, China
Ministry of Education Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences(Beijing), Beijing 100083, China | yq@cugb.edu.cn |
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| Abstract: |
| To alleviate environmental pollution caused by the organic chlorinated herbicide 2, 4-dichlorophenoxyacetic acid(2, 4-D), in this study, iron-cobalt bimetallic nanoparticles(n-Fe/Co) were prepared by liquid-phase reduction, and the degradation performance of 2, 4-D via the activated peroxymonosulfate(PMS) system was optimized by adjusting the synthesis ratio of iron and cobalt. The results showed that 2, 4-D(10 mg·L-1) was completely removed within 30 min using 0.03 g·L-1 of n-Fe/Co and 0.5 mmol·L-1 of PMS at pH 4.5, and the removal of 2, 4-D was enhanced by 60.9 percent compared with the application of nano zero-valent iron(nZVI) alone. We found that n-Fe/Co could effectively remove 2, 4-D over a wide pH range(2-9) and under complex anion conditions. Free radical inhibition experiments revealed that hydroxyl radicals were the main active species involved in the reaction, with a contribution rate of 62.2%. On the basis of our analysis of intermediate products, we propose a degradation mechanism and the degradation pathway of 2, 4-D in the n-Fe/Co-PMS system. The findings of this study indicate that the n-Fe/Co nanocomposite-activated PMS system has considerable application potential for the treatment of 2, 4-D herbicide pollution in water. |
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