| Title: | An efficient process for aromatic VOCs degradation: Combination of VUV photolysis and photocatalytic oxidation in a wet scrubber |
| Author(s): | Lei D; Xie X; Xiang Y; Huang X; Xiao F; Cao J; Li G; Leung DYC; Huang H; |
| Address: | "School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China; Scientific Research Academy of Guangxi Environmental Protection, Guangxi, China. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China. Electronic address: caojp3@mail.sysu.edu.cn. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong. Electronic address: ycleung@hku.hk. School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, China. Electronic address: seabao8@gmail.com" |
| DOI: | 10.1016/j.chemosphere.2022.136656 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "The elimination of volatile organic compounds (VOCs) via vacuum ultraviolet (VUV) photolysis is greatly limited by low removal efficiency and gaseous byproducts generation, while photocatalytic oxidation of VOCs suffers from catalytic deactivation. Herein, a coupled process of gaseous VUV photolysis with aqueous photocatalytic oxidation with P25 as the catalyst was firstly proposed for efficient aromatic VOCs removal (VUV/P25). The removal efficiency of toluene reached 86.2% in VUV/P25 process, but was only 33.6% and 58.1% in alone gaseous VUV photolysis and aqueous ultraviolet photocatalytic oxidation (UV/P25) process, respectively. Correspondingly, the outlet CO(2) concentration in VUV/P25 process reached 132 ppmv. Toluene was firstly destructed by high-energy photons generated from gaseous VUV photolysis, resulting in its incomplete oxidation to form soluble intermediates including acids, aldehydes, esters. These soluble intermediates would be further degraded and mineralized into CO(2) in subsequent aqueous UV/P25 process. Notably, the concentrations of intermediates in VUV/P25 were much lower than those in VUV photolysis, indicating the synergy effect of VUV photolysis and UV/P25 process. The stability tests proved that VUV/P25 process maintained an excellent toluene degradation performance and P25 did not suffer from catalytic deactivation. In addition to toluene, the VUV/P25 system also achieved the efficient and sustainable degradation of styrene and chlorobenzene, suggesting its good application prospect in industrial VOCs treatment. This study proposes an efficient and promising strategy for deep oxidation of multiple aromatic VOCs in industries" |
| Keywords: | Photolysis *Volatile Organic Compounds Vacuum Carbon Dioxide Ultraviolet Rays Toluene/analysis Oxidation-Reduction Gases Water Chlorobenzenes Aldehydes Styrenes Aqueous photocatalytic oxidation Aromatic VOCs Gaseous VUV photolysis O(2) molecule Reactive o; |
| Notes: | "MedlineLei, Dongxue Xie, Xiaowen Xiang, Yongjie Huang, Xiongfei Xiao, Fei Cao, Jianping Li, Guangqing Leung, Dennis Y C Huang, Haibao eng England 2022/10/04 Chemosphere. 2022 Dec; 309(Pt 2):136656. doi: 10.1016/j.chemosphere.2022.136656. Epub 2022 Sep 30" |
