UV/O<sub>3</sub>/TiO<sub>2</sub>耦合工艺降解2,4,6-三氯苯酚

朱彤; 杨世鹏; 谭伟强; 王凯军

doi:10.13205/j.hjgc.202103002

UV/O₃/TiO₂耦合工艺降解2,4,6-三氯苯酚

doi: 10.13205/j.hjgc.202103002

朱彤^1,2,
杨世鹏²,
谭伟强¹,
王凯军^2, ,

1. 青岛理工大学环境与市政工程学院, 山东青岛 266033;
2. 清华大学环境学院, 北京 100084

基金项目:

国家水体污染控制与治理科技重大专项（2017ZX07103-003）；国家水体污染控制与治理科技重大专项（2018ZX07110）。

详细信息

作者简介:
朱彤(1996-),女,硕士研究生,主要研究方向为废水高级氧化处理技术。zhutong1229@126.com

通讯作者:
王凯军(1960-),男,博士,教授,主要研究方向为厌氧生物发酵及水污染控制。wkj@tsinghua.edu.cn

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出版历程
- 收稿日期: 2020-06-16
- 网络出版日期: 2021-07-19

DEGRADATION OF 2,4,6-TRICHLOROPHENOL BY UV/O₃/TiO₂ COUPLING PROCESS

1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China;
2. School of Environment, Tsinghua University, Beijing 100084, China

摘要

摘要: 通过构建UV/O₃/TiO₂耦合工艺反应体系，打破了以臭氧为基础的高级氧化技术臭氧利用率低的技术瓶颈，使用电子自旋共振波谱仪和荧光探针法分析了UV/O₃/TiO₂耦合工艺的反应机理，明确了臭氧链式反应产生的O₂在反应体系内自循环利用是提高臭氧利用率的主要原因。以2，4，6-三氯苯酚为目标污染物，通过分析初始浓度、接触时间、pH、催化剂投加量等影响因素，对比UV/O₃、UV/TiO₂工艺的降解效果，显示出UV/O₃/TiO₂耦合工艺的技术优势。在相同条件下，单独UV/TiO₂光催化体系和UV/O₃体系对2，4，6-三氯苯酚模拟配水的TOC矿化率分别为12.65%和51.54%，反应速率常数分别为0.0058，0.1956 min^-1，而UV/O₃/TiO₂耦合体系的矿化率达到82.97%，反应速率常数为0.2893 min^-1，耦合工艺的臭氧利用率较UV/O₃工艺提高11.7百分点，并且在pH=3~11的较宽范围内有良好的适用性，证明了理论研究结论的正确性。
- UV/O₃/TiO₂ /
- 2,4,6-三氯苯酚 /
- 光催化臭氧化 /
- 羟基自由基
Abstract: This paper broke the technical bottleneck of low ozone utilization of advanced oxidation technology based on ozone, through constructing a reaction system of UV/O₃/TiO₂ coupling process. The reaction mechanism of UV/O₃/TiO₂ coupling process was analyzed by ESR and fluorescence probe method, and it was clear that the self recycling of oxygen produced by ozone chain reaction in the reaction system was the main reason to improve ozone utilization. Taking 2,4,6-trichlorophenol as the target pollutant, through the analysis of initial concentration, contact time, pH, catalyst dosage and other factors, the degradation effect of UV/O₃ and UV/TiO₂ processes was compared, which highlighted the technical advantages of UV/O₃/TiO₂ coupling process. The results showed that the mineralization rate of 2,4,6-trichlorophenol solution by UV/TiO₂ and UV/O₃ was 12.65% and 51.54% in the same condition, and the reaction rate constant was 0.0058 min^-1 and 0.1956 min^-1 respectively. The mineralization rate of 2,4,6-trichlorophenol by UV/O₃/TiO₂ was 82.97% and the reaction rate constant was 0.2893 min^-1. The utilization ratio of ozone was increased by 11.7% in the coupling process with good adaptability in the wide range of pH=3~11. The result could provide data support for theoretical research conclusion.
- UV/O₃/TiO₂ /
- 2,4,6-TCP /
- photocatalytic ozonation /
- hydroxyl radical

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