Page 134 - 《精细化工》2022年第5期

第 39 卷第 5 期 精 细 化 工 Vol.39, No.5
2022 年 5 月 FINE CHEMICALS May 2022

水处理技术与环境保护
亚硝酸盐共存下 UV/PS/CNTs 降解

2,6-二氯苯酚及其机理

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田孜欣，陈 滢 ，郭洪光
(四川大学 建筑与环境学院，四川 成都 610000）

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摘要：在亚硝酸盐（NO 2 ）共存下采用紫外（UV）协同碳纳米管（CNTs）复合活化过硫酸盐（UV/PS/CNTs）
工艺对 2,6-二氯苯酚（2,6-DCP）进行降解，探究其影响因素及降解机理，考察体系循环活化效能和副产物生成
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情况。结果表明，对于 200 mL 0.05 mmol/L 2,6-DCP 水溶液，在反应时间 30 min、反应温度 25 ℃、NO 2 0.2 mmol/L、
PS 投加量 0.5 mmol/L、CNTs 投加量 50 mg/L 时，UV/PS/CNTs 体系对 2,6-DCP 降解率达 95.9%。该体系中，2,6-DCP
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降解率随 PS 和 CNTs 投加量的增加而增大，随 NO 2 浓度增大而减小，溶液初始 pH 对目标物降解呈先增大后减
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小趋势，pH=9 时，2,6-DCP 降解率为 99.8%，表观反应速率常数为 0.3483 min 。CNTs 具有良好的循环使用性，
使用 5 次后，2,6-DCP 降解率仍可达 89.0%，且在实际水体中对 2,6-DCP 的降解效果较好。该体系对 2,6-DCP
降解遵循以单线态氧为主导的非自由基氧化途径，且反应过程中生成了一氯硝基苯酚副产物。
关键词：亚硝酸盐；UV；过硫酸盐；碳纳米管；2,6-二氯苯酚；非自由基氧化；水处理技术
中图分类号：X703 文献标识码：A 文章编号：1003-5214 (2022) 05-0988-08

Degradation and mechanism of 2,6- dichlorophenol by
UV/PS/CNTs in the presence of nitrite

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TIAN Zixin, CHEN Ying , GUO Hongguang
（College of Architecture and Environment, Sichuan University, Chengdu 610000, Sichuan, China）

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Abstract: 2,6-Dichlorophenol (2,6-DCP) was degraded in the presence of nitrite (NO 2 ) by persulfate
activated with carbon nanotubes (CNTs) under UV light irradiation (UV/PS/CNTs). Herein, the influencing
factors and degradation mechanism were investigated, followed by exploration on cyclic activation
potential and by-product generation. The results showed that for 200 mL 0.05 mmol/L 2,6-DCP aqueous
solution, the degradation rate of 2,6-DCP by UV/PS/CNTs system was 95.9% under reaction conditions of
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reaction time of 30 min, reaction temperature of 25 ℃, NO 2 concentration of 0.2 mmol/L, PS dosage of 0.5
mmol/L, and CNTs dosage of 50 mg/L. It was also found that the degradation rate of 2,6-DCP was
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positively influenced by PS and CNTs dosage but negatively by NO 2 concentration. The effect of initial pH
of solution on 2,6-DCP degradation showed a trend of first increasing and then decreasing with a
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degradation rate of 99.8% and an apparent reaction rate constant of 0.3483 min at pH 9. Furthermore,
CNTs exhibited good recycling performance. After used 5 times, CNTs could still lead to a degradation rate
of 2,6-DCP up to 89.0%, and its degradation effect was good even in actual water system. The mechanism
study suggested that the degradation of 2,6-DCP in this system followed a singlet-oxygen dominated non-
radical oxidation pathway, and by-products like monochloronitrophenol were generated during the reaction.
Key words: nitrite; UV; persulphate; CNTs; 2,6-DCP; non-radical oxidation; water treatment technology

[1]
2,6-二氯苯酚（2,6-DCP）作为典型的氯酚类化 防腐剂、除锈剂、防蛀剂等的合成 。水环境残留该
合物，是一种重要的有机中间体，已广泛用于木材 物质的相关遗传毒性和“三致效应”可通过地表水

收稿日期：2022-01-25; 定用日期：2022-04-06; DOI: 10.13550/j.jxhg.20220092
基金项目：国家自然科学基金（51878422，42177060）
作者简介：田孜欣（1996—），女，硕士生，E-mail：tzxscu@163.com。联系人：陈 滢（1975—），女，副教授，E-mail：cylm@163.com。