迷迭香酸增效PSF降解橙黄G的机制和生态毒性评估

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摘要本文选取橙黄G为目标污染物,迷迭香酸为增效试剂,聚合硅酸铁为催化剂,研究了迷迭香酸增效聚合硅酸铁UV-Fenton降解橙黄G的机制,讨论了迷迭香酸对橙黄G降解途径的影响,评估了降解中间产物的水生态毒性.结果表明:迷迭香酸同时具备还原和络合能力,能够高效促进催化剂释放铁离子和亚铁离子,在0.05mmol/L低浓度下即可增效降解橙黄G,反应1min时后者脱色率高达88.5%,反应15min时接近100%.伴随着降解中间产物的矿化,铁离子会被催化剂吸附回收,体系总铁离子浓度可从峰值7.65mg/L降至3.10mg/L,从而避免了铁离子的流失和二次污染问题.外加迷迭香酸不会改变橙黄G的降解途径,但二者在降解过程中均会产生毒性更强的中间产物,中间产物只有充分矿化至草酸阶段才能达到脱毒效果.

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关键词 ：迷迭香酸, 聚合硅酸铁(PSF), 紫外光助-芬顿, 橙黄G, 生态毒性

Abstract：In this study, Orange-G, polymeric ferric silicate (PSF) and rosmarinic acid were selected as modal pollutant, catalyst and enhanced agent, respectively. The enhancement mechanism of rosmarinic acid on Orange-G degradation in heterogeneous UV-Fenton system with PSF as catalyst was discussed, the effect of rosmarinic acid on the degradation pathway of Orange-G was studied and the ecotoxicity of degradation intermediates was evaluated. The results showed that rosmarinic acid could effectively promote the leaching of iron and ferrous ions from catalyst through the reduction and complexation process. When 0.05mmol/L rosmarinic acid was introduced in heterogeneous UV-Fenton system, the degradation of Orange-G could be significantly promoted. Under this condition, the degradation rate of Orange-G could increase to 88.5% within 1min and near 100% within 15min respectively. When the intermediates continuously degraded, the iron ions could be re-adsorbed on catalyst and the total iron ions concentration decreased from 7.65mg/L to 3.10mg/L, avoiding the loss of iron ions and secondary pollution. Besides, the additional rosmarinic acid couldn't change the degradation pathway of Orange-G, but some more toxic degradation products would be formed during the degradation of Orange-G and rosmarinic acid, the ecotoxicity would be eliminated when all the intermediates were mineralized to oxalic acid.

Key words： rosmarinic acid polymeric ferric silicate (PSF) UV-Fenton Orange-G ecotoxicity

收稿日期: 2022-09-18

PACS:

X503

基金资助:国家自然科学基金资助项目(21966021,21367021);广东省科技计划资助项目(2020B1212060055)

通讯作者: 陈建新,教授,jxchen@ncu.edu.cn E-mail: jxchen@ncu.edu.cn

作者简介: 熊志超(1997-),男,江西丰城人,南昌大学硕士研究生,主要从事水污染控制研究.654795510@qq.com.

引用本文:

熊志超, 张传波, 刘雅倩, 邓佩, 冯斐, 邵莉, 陈建新. 迷迭香酸增效PSF降解橙黄G的机制和生态毒性评估[J]. 中国环境科学, 2023, 43(5): 2286-2295. XIONG Zhi-chao, ZHANG Chuan-bo, LIU Ya-qian, DENG Pei, FENG Fei, SHAO Li, CHEN Jian-xin. Enhanced mechanism and ecotoxicity evaluation of rosmarinic acid enhanced PSF-catalyzed system on Orange-G degradation. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2286-2295.

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