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| 下载次数 | 被引频次 | 阅读次数 |
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。
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.
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基本信息:
DOI：10.13353/j.issn.1004.9533.20201007
中图分类号:X703
引用信息:
[1]杨茂林,刘新宇,马威,等.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(04):64-72.DOI:10.13353/j.issn.1004.9533.20201007.
基金信息:
国家自然科学基金项目(21606109)
2021-04-06
2021-04-06
2021-04-06