| 张荣,罗新宇,杨琦.Fe/Co双金属材料活化过一硫酸盐氧化降解水中2，4-D[J].农业环境科学学报,2024,43(3):665-674. |
| Fe/Co双金属材料活化过一硫酸盐氧化降解水中2，4-D |
| Oxidative degradation of 2, 4-D in water by Fe/Co bimetallic nanocomposite-activated peroxymonosulfate |
| 投稿时间：2023-03-27 |
| DOI：10.11654/jaes.2023-0227 |
| 中文关键词: 2，4-二氯苯氧乙酸（2，4-D） 纳米零价铁 双金属 过一硫酸盐 自由基 |
| 英文关键词: 2,4-dichlorophenoxyacetic acid(2, 4-D) nano zero-valent iron bimetal peroxymonosulfate radical |
| 基金项目:国家科技重大专项（2015ZX07406005-001）；大气污染成因与控制技术研究重点专项（2016YFC0209205） |
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| 中文摘要: |
| 为了处理有机氯除草剂2，4-二氯苯氧乙酸（2，4-D）造成的环境污染，本研究采用液相还原法制备了铁钴双金属纳米颗粒（n-Fe/Co），并通过Fe、Co的合成比例优化了活化过一硫酸盐（PMS）体系对2，4-D的降解性能。结果表明：在pH为4.5的条件下，使用0.03 g·L-1的n-Fe/Co和0.5 mmol·L-1的PMS，2，4-D（10 mg·L-1）在30 min内完全去除，与单纯的纳米零价铁（nZVI）相比，2，4-D的去除率提升了60.9个百分点。n-Fe/Co可以在很宽的pH范围（2~9）和复杂的阴离子条件下有效去除2，4-D。自由基抑制实验表明羟基自由基是参与反应的主要活性物种（贡献率达到62.2%）。在中间产物分析的基础上，提出了2，4-D在n-Fe/Co-PMS体系中的降解机理和降解途径。研究表明，n-Fe/Co复合材料活化PMS系统在处理水中的2，4-D除草剂污染方面有很大的应用前景。 |
| 英文摘要: |
| 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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