光催化辅助高浓度臭氧循环工艺降解对氯苯酚及协同机理

摘要针对臭氧（O₃）降解对氯苯酚（4-CP）中效率有限且尾气排放高的问题，采用光催化辅助高浓度臭氧循环工艺并对TiO₂浓度、循环气量以及pH值等因素进行研究，结合对苯醌变化及猝灭剂试验分析其协同机理。循环气量为2.0 L·min^-1，TiO₂投加量为250 mg·L^-1时，O₃/TiO₂/UV体系的降解动力学系数为0.291 min^-1，是O₃体系的1.24倍；pH值在6.7~11.0区间内与降解效果呈正相关，pH值为11.0时反应10 min，O₃/TiO₂/UV协同体系中4-CP和COD降解率为98.21%和61.68%。微量TiO₂在高浓度臭氧水中激发的·OH以及·O₂^-是促使对苯醌等前期产物生成与降解的主要氧化粒子，且OH^-的加入能促进相应自由基的生成。

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	杨茂林
	刘新宇
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	张博文
	崔政伟

关键词：光催化高浓度臭氧对氯苯酚羟基自由基对苯醌

Abstract： High-concentration ozone cycle process assisted by photocatalysis was investigated to solve the limited efficiency and high exhaust emissions in the ozone degradation of p-chlorophenol. When the circulating gas volume was 2.0 L·min^-1 and the dosage of TiO₂ was 250 mg·L^-1, the degradation kinetic coefficient of O₃/TiO₂/UV system was 0.291 min^-1, which was 1.24 times as that of O₃ system. The pH was proportional to the degradation effect in the range of 6.7-11.0. When the pH was 11.0 and the reaction took for 10 min, the degradation rates of 4-CP and COD in the O₃/TiO₂/UV system were 98.21% and 61.68%, respectively. The ·OH and ·O₂^- excited by the trace of TiO₂ in high-concentration ozone water are the primary radicals that promote the generation and degradation of p-benzoquinone and other early products, and the OH^- can also accelerate the generation of the radical.

Keywords： photocatalysis； high-concentration ozone； p-chlorophenol； hydroxyl radical； benzoquinone

Received 2020-10-26;

Fund:国家自然科学基金项目（21606109）。

Corresponding Authors: 崔政伟,E-mail:Cuizhengwei@jiangnan.edu.cn。 Email: Cuizhengwei@jiangnan.edu.cn

About author: 杨茂林(1995-),男,硕士研究生,主要从事化工设备以及有机污水快速氧化处理研究。

引用本文:

杨茂林, 刘新宇, 马威, 张博文, 崔政伟.光催化辅助高浓度臭氧循环工艺降解对氯苯酚及协同机理[J]. 化学工业与工程, 2021,38(4): 64-72

Yang Maolin, Liu Xinyu, Ma Wei, Zhang Bowen, Cui Zhengwei.Degradation of p-chlorophenol with High-concentration Ozone Cycle Assisted by Photocatalysis and Its Synergy Mechanism[J]. Chemcial Industry and Engineering, 2021,38(4): 64-72

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