Degradation of acetochlor via the UV/persulfate process: Mechanisms, kinetics, and pathways

IF 4.3 4区环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL

Water Reuse Pub Date : 2024-06-12 DOI:10.2166/wrd.2024.025

Chen-Yan Hu, Sheng-Jie Ji, Zheng-Yu Dong, Yi-Hui Wu, Zi-Yi Dong, Li-Li Hu, Xin-Yu Yang, Hao Liu

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Abstract

The environmental health risks of acetochlor (ACE) have received widespread attention. The removal of ACE via the ultraviolet/persulfate (UV/PS) process was investigated in this study. The degradation of ACE in the UV/PS process fitted pseudo-first-order kinetics. ACE can be effectively removed in the pH range of 5.0–9.0. In addition, the removal efficiency of ACE increases with the increase in PS concentration. The experimental and calculation results prove that the contributions of UV irradiation, sulfate radicals (SO4•-) and hydroxyl radicals (HO·) were 40, 52.1, and 6.43%, respectively. And the second-order rate constants between SO4•- and HO· with ACE are 3.5 × 109 and 5.6 × 109M−1s−1, respectively. The influences of different water matrices were explored. Both chloride ions and bicarbonate can inhibit the degradation of ACE, while the effects of sulfate ions and nitrate can be negligible. Humic acid (HA) has an inhibitory effect of ACE degradation. The intermediates were detected and the possible degradation pathway of ACE was proposed. The results of this study can provide technical support for the control of ACE in the environment.

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通过紫外线/过硫酸盐过程降解乙草胺：机理、动力学和途径

乙酰氯（ACE）的环境健康风险已受到广泛关注。本研究探讨了通过紫外线/过硫酸盐（UV/PS）工艺去除乙酰甲胺磷的问题。在 UV/PS 过程中，乙酰甲胺磷的降解符合假一阶动力学。在 pH 值为 5.0-9.0 的范围内，ACE 可被有效去除。此外，随着 PS 浓度的增加，ACE 的去除率也在增加。实验和计算结果证明，紫外线照射、硫酸根自由基（SO4--）和羟基自由基（HO-）的贡献率分别为 40%、52.1% 和 6.43%。SO4-- 和 HO- 与 ACE 之间的二阶速率常数分别为 3.5 × 109 和 5.6 × 109M-1s-1。研究还探讨了不同水基质的影响。氯离子和碳酸氢盐都能抑制 ACE 的降解，而硫酸根离子和硝酸盐的影响可以忽略不计。腐殖酸（HA）对 ACE 降解有抑制作用。该研究检测了 ACE 的中间产物，并提出了 ACE 的可能降解途径。该研究结果可为环境中 ACE 的控制提供技术支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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