| UV/O3/TiO2耦合工艺降解2,4,6-三氯苯酚 |
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| 引用本文： | 朱彤,杨世鹏,谭伟强,王凯军.UV/O3/TiO2耦合工艺降解2,4,6-三氯苯酚[J].环境工程,2021,39(3):7-13. |
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| 作者姓名： | 朱彤 杨世鹏 谭伟强 王凯军 |
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| 作者单位： | 1. 青岛理工大学 环境与市政工程学院, 山东 青岛 266033; |
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| 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）。 |
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| 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。
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| 关 键 词： | UV/O3/TiO2 2 4 6-三氯苯酚 光催化臭氧化 羟基自由基 |
| 收稿时间： | 2020-06-16 |
DEGRADATION OF 2,4,6-TRICHLOROPHENOL BY UV/O3/TiO2 COUPLING PROCESS |
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| Affiliation: | 1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China;2. School of Environment, Tsinghua University, Beijing 100084, China |
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| 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. |
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