邓亚梅^1,2,
王荣富¹,
方国东²,
周东美²
1. 安徽农业大学, 合肥 230036;
2. 南京土壤研究所 中国科学院土壤环境与污染修复重点实验室, 南京 210008

作者简介: 邓亚梅(1991-),女,硕士,研究方向为生理生态学,E-mail:244693951@qq.com.

基金项目: “十二五”国家科技支撑计划(2012BAD14B)；江苏省自然科学基金(BK20141047)；江苏省环保科技课题(2015011)


中图分类号: X171.5

Vanadium Pentoxide-Based Fenton-like Reactions for Diethyl Phthalate Degradation

Deng Yamei^1,2,
Wang Rongfu¹,
Fang Guodong²,
Zhou Dongmei²
1. Anhui Agricultural University, Hefei 230036, China;
2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

CLC number: X171.5

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摘要:发展了基于五氧化二钒(V₂O₅)和过氧化氢(H₂O₂)的新型类Fenton体系,探索了此体系产生羟基(·OH)的机制及降解邻苯二甲酸二乙酯(DEP)的效率;并考察了V₂O₅投加量、H₂O₂浓度,以及草酸对DEP降解的影响。结果表明,当V₂O₅投加量为0.1 g·L^-1,H₂O₂浓度为2.0 mmo·L^-1,反应24 h后,对DEP(25 mg·L^-1)的降解率可达61.1%,增加或降低V₂O₅投加量和H₂O₂浓度均不利于DEP的降解。利用电子顺磁共振技术(Electron Paramagnetic Resonance, EPR)耦合5,5-二甲基-1-吡咯啉氮氧化物(DMPO)为捕获剂对反应体系中的主导自由基进行鉴定,发现·OH是体系降解DEP的主要活性物种,利用苯甲酸作为探针分子实现了·OH的间接定量,并初步推测了V₂O₅活化H₂O₂的过程。
关键词: 五氧化二钒/
过氧化氢/
类Fenton/
邻苯二甲酸二乙酯/
降解机制

Abstract:In this study, a novel Fenton-like reaction based on V₂O₅ and H₂O₂ was developed, and the mechanism of hydroxyl radical production as well as the efficiency for diethyl phthalate (DEP) degradation was explored in these processes. Additionally, the effects of V₂O₅ loading, H₂O₂ concentration and oxalic acid on DEP degradation in the V₂O₅/H₂O₂ system were also examined. The results showed that 61.1% of 25 mg·L^-1 DEP was degraded with 2 mmo·L^-1 H₂O₂ in the presence of 0.1 g·L^-1 V₂O₅ within 24 h, which indicated that V₂O₅ exhibits an excellent ability to catalyze the decomposition of H₂O₂ for DEP degradation, while both increasing and decreasing V₂O₅ loading or H₂O₂ concentration inhibited DEP degradation. Electron paramagnetic resonance (EPR) technique coupled with DMPO as spin-trapping agent was used to identify the dominant reactive species, which indicated that hydroxyl radical was the main free radical for DEP degradation in the V₂O₅/H₂O₂ system. Chemical probe method with benzoic acid (BA) was further used to quantify the formation of hydroxyl radical and elucidated mechanism of this process.
Key words:V₂O₅/
H₂O₂/
Fenton-like/
DEP/
degradation mechanism.