Accelerated oxidation of VOCs via vacuum ultraviolet photolysis coupled with wet scrubbing process  

作　　者：Ruijie Xie Dongxue Lei Xiaowen Xie Ziyi Suo Dennis Y.C.Leung Jianping Cao Fang Ruimei Haibao Huang 

机构地区：[1]School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]Department of Mechanical Engineering,University of Hong Kong,Hong Kong 999077,China [3]College of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,China [4]Scientific Research Academy of GuangXi Environmental Protection,Nanning 530022,China

出　　处：《Journal of Environmental Sciences》2023年第12期55-64,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 22076224, 51908091 and 51908563);Open Fund of Guangdong Province Engineering Laboratory for Air Pollution Control (No. 2019323609-01);Key Laboratory of Water and Air Pollution Prevention and Control of Guangdong Province (No. 201901202)。

摘　　要：Vacuum ultraviolet(VUV) photolysis is a facile method for volatile organic compounds(VOCs) elimination, but is greatly limited by the relatively low removal efficiency and the possible secondary pollution. To overcome above drawbacks, we developed an efficient method for VOCs elimination via VUV photolysis coupled with wet scrubbing process. In this coupled process, volatile toluene, a representative of VOCs, was oxidized by the gas-phase VUV photolysis, and then scrubbed into water for further oxidation by the liquid-phase VUV photolysis. More than 96% of toluene was efficiently removed by this coupled process, which was 2 times higher than that in the gas-phase VUV photolysis. This improvement was attributed to the synergistic effect between gas-phase and liquid-phase VUV photolysis. O3and HO·are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O3in gas-phase VUV photolysis can efficiently enhance the HO·production in liquid-phase VUV photolysis. The result from in-situ proton transfer reaction ionization with mass analyzer(PTR-MS) further suggested that most intermediates were trapped by the wet scrubbing process and efficiently oxidized by the liquid-phase VUV photolysis, showing a high performance for controlling the secondary pollution. Furthermore, the result of stability test and the reuse of solution demonstrated that this coupled process has a highly stable and sustainable performance for toluene degradation. This study presents an environmentally benign and highly efficient VUV photolysis for gaseous VOCs removal in the wet scrubbing process.

关 键 词：Volatile organic compounds(VOCs) Vacuum ultraviolet(VUV)photolysis Wet scrubbing process Toluene degradation Intermediates analysis 

分 类 号：X701[环境科学与工程—环境工程]