羟胺强化Cu (II)活化过氧乙酸降解有机染料

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摘要采用盐酸羟胺(HA)强化Cu(II)活化过氧乙酸(PAA)降解亚甲基蓝(MB),考察了溶液初始pH值、反应物投加量及水环境中常见阴离子、天然有机物对HA/Cu(II)/PAA体系去除MB效果的影响;通过鉴别体系中的主要活性物质,探究PAA在HA/Cu(II)/PAA体系中的活化机理.结果表明:pH值为7.0条件下,当Cu(II)和PAA投加量均为200μmol/L时,向Cu(II)/PAA体系中加入400μmol/L的HA,经过30min的反应,MB的去除率可由14.7%增加到74.1%,降解速率由0.0047min^-1提高至0.2271min^-1;HA的引入推动了Cu(II)向Cu(I)的转化,促进了PAA的催化分解,导致体系中生成更多的活性物种.基于自由基淬灭实验结果,羟基自由基(HO•)主导了MB的氧化降解.溶液pH值对MB降解影响较大,中性和弱碱性环境更有利于HA/Cu(II)/PAA体系对MB的降解.共存Cl^-和HCO₃^-会抑制MB降解,而天然有机质对MB降解起一定促进作用.

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	欧杰丽
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关键词 ：过氧乙酸, Cu (II), 盐酸羟胺, 高级氧化, 亚甲基蓝

Abstract：The degradation of methylene blue (MB) was enhanced by using hydroxylamine hydrochloride (HA) to activate peracetic acid (PAA) in the presence of Cu(II). The effects of initial solution pH, reactant dosages, common anions and natural organic matter in the water environment on the MB removal efficiency in the HA/Cu(II)/PAA system were investigated. The activation mechanism of PAA in the HA/Cu(II)/PAA system was explored by identifying the main active species in the system. In the experiments, 400 μmol/L HA was added into 200μmol/L Cu(II) and PAA system under pH 7.0. The results showed that the MB removal rate was increased from 14.7% to 74.1%, and the degradation rate increased from 0.0047 to 0.2271min^-1 after 30 minutes of reaction. The introduction of HA promoted the conversion of Cu(II) to Cu(I), which facilitated the catalytic decomposition of PAA, leading to the generation of more reactive species in the system. Based on the results of radical quenching experiments, hydroxyl radicals (HO•) were found to dominate the oxidative degradation of MB. The degradation of MB was significantly affected by the solution pH. The neutral and slightly alkaline conditions were more favorable for the degradation of MB in the HA/Cu(II)/PAA system. The coexistence of Cl^- and HCO₃^- inhibited the degradation of MB, while the natural organic matters had a certain promoting effect on the degradation of MB.

Key words： peracetic acid Cu(II) hydroxylamine advanced oxidation methylene blue

收稿日期: 2024-02-04

PACS:

X703

基金资助:四川省科技厅重点研发项目(2021YJ0385)

通讯作者: 欧杰丽,刘义青,讲师,liuyq@swjtu.edu.cn E-mail: liuyq@swjtu.edu.cn

作者简介: 欧杰丽(1994-),女,广西桂林人,西南交通大学博士研究生,主要从事水污染控制研究.发表论文2篇.OO23@my.swjtu.edu.cn.

引用本文:

欧杰丽, 刘义青, 唐钰琦, 付永胜. 羟胺强化Cu (II)活化过氧乙酸降解有机染料[J]. 中国环境科学, 2024, 44(10): 5547-5555. OU Jie-li, LIU Yi-qing, TANG Yu-qi, FU Yong-sheng. Significantly enhanced degradation of organic dyes by Cu(II) activated peracetic acid with hydroxylamine. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5547-5555.

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