PSF多相UV-Fenton体系原儿茶酸与龙胆酸的增效对比

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摘要对比研究了原儿茶酸和龙胆酸对聚合硅酸铁（PSF）多相UV-Fenton体系降解橙Ⅱ的增效能力，分析了两种增效体系中铁离子转化、H₂O₂分解以及·OH生成之间的关系，探讨了两种增效试剂对PSF多相UV-Fenton体系的增效机制.结果表明：原儿茶酸和龙胆酸均能够有效促进催化剂Fe²⁺生成与释放，进而提高体系·OH的浓度、促进橙Ⅱ的降解.相对原儿茶酸，龙胆酸对PSF的还原能力更强，其相应增效体系中·OH的浓度更高、橙Ⅱ的降解速度更快.0.2mmol/L的增效浓度下，橙Ⅱ在原儿茶酸和龙胆酸增效体系中第一段脱色速率常数能分别从基础体系的0.11min^-1提高至1.68和2.48min^-1，分别增加14.27倍和21.55倍.原儿茶酸和龙胆酸能够循环增效PSF多相UV-Fenton体系降解橙Ⅱ，反应结束后PSF对Fe³⁺的再吸附使得溶液总铁离子浓度低于5mg/L，从而避免催化剂铁元素的损失以及铁离子的二次污染，表明原儿茶酸和龙胆酸均是PSF多相UV-Fenton体系的高效增效试剂.

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关键词 ：多相UV-Fenton体系, 聚合硅酸铁, 原儿茶酸, 龙胆酸, 橙Ⅱ

Abstract：The capability of protocatechuic acid and gentisic acid in enhancing the degradation of orange Ⅱ in the heterogeneous UV-Fenton system with PSF as catalyst was compared, and the relationship among iron ion conversion, H₂O₂ decomposition and·OH generation in the two systems was analyzed. The enhancement mechanisms of the two reagents in heterogeneous UV-Fenton system with PSF as catalyst was further discussed. The experimental results showed that both protocatechuic acid and gentisic acid could effectively promote the formation and release of Fe²⁺, thereby increasing ·OH concentration and promoting orange Ⅱ degradation. Compared with protocatechuic acid, gentisic acid showed better capacity for reducing PSF. As a result, higher ·OH concentration and faster orange Ⅱ degradation rate were achieved in the gentisic acid system. With the addition of 0.2mmol/L reagent, the "first" kinetic rate constant for orange Ⅱ decolorization increased from 0.11 to 1.68min^-1 for the protocatechuic acid system, and to 2.48min^-1 for the gentisic acid system, which increased by 14.27 and 21.55 times, respectively. During consecutive runs, both the two acids could enhance orange Ⅱ degradation. After treatment, the readsorption of Fe³⁺ by PSF made the total iron ion concentration in solution lower than 5mg/L, avoiding the loss of iron ions and the secondary pollution. Our results indicated that protocatechuic acid and gentisic acid were both highly effective enhancement reagents to heterogeneous UV-Fenton system with PSF as catalyst.

Key words： heterogeneous UV-Fenton system PSF protocatechuic acid gentisic acid orange Ⅱ

收稿日期: 2020-08-24

PACS:

X703

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（2017B030314175）

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

作者简介: 苏晓轩(1996-),男,新疆石河子人,南昌大学硕士研究生,主要从事水污染控制研究.

引用本文:

苏晓轩, 徐国鹏, 李献众, 刘力章, 陈建新. PSF多相UV-Fenton体系原儿茶酸与龙胆酸的增效对比[J]. 中国环境科学, 2021, 41(4): 1624-1633. SU Xiao-xuan, XU Guo-peng, LI Xian-zhong, LIU Li-zhang, CHEN Jian-xin. Comparison of the enhanced effect of protocatechuic acid and gentisic acid on the heterogeneous UV-Fenton system with Poly-Silicate-Ferric(PSF) as catalyst. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1624-1633.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I4/1624

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