Accelerated oxidation of VOCs via vacuum ultraviolet photolysis coupled with wet scrubbing process
Accelerated oxidation of VOCs via vacuum ultraviolet photolysis coupled with wet scrubbing process
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通过真空紫外光解结合湿法洗涤工艺加速挥发性有机化合物的氧化
DOI：
10.1016/j.jes.2022.05.002
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发表时间：
--
影响因子：
6.9
通讯作者：
Haibao Huang
中科院分区：
文献类型：
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作者：
Ruijie Xie;Dongxue Lei;Xiaowen Xie;Ziyi Suo;Dennis Y.C. Leung;Jianping Cao;Fang Ruimei;Haibao Huang
真空紫外光（VUV）光解是一种简单的去除挥发性有机物（VOCs）的方法，但其去除效率较低且可能产生二次污染。为了克服上述缺点，我们开发了一种有效的方法来消除挥发性有机物的真空紫外光解耦合湿洗涤过程。在此耦合过程中，挥发性甲苯，挥发性有机污染物的代表，被气相VUV光解氧化，然后洗涤到水中进一步氧化的液相VUV光解。该耦合过程对甲苯的去除率可达96%以上，比气相真空紫外光降解高2倍。这是由于气相和液相真空紫外光解之间的协同效应。在该耦合过程中，O3和HO ·是甲苯降解的主要反应物种，气相VUV光解过程中O3的产生可以有效地促进液相VUV光解过程中HO ·的产生.原位质子转移反应电离质谱（PTR-MS）结果进一步表明，湿法洗涤过程中大部分中间产物被捕集，液相真空紫外光解过程中大部分中间产物被有效氧化，显示出良好的二次污染控制性能。稳定性试验和溶液回用结果表明，该耦合工艺具有较高的稳定性和可持续性。本研究提出了一种环境友好和高效的真空紫外光分解去除气态挥发性有机物的湿法洗涤过程。
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. O 3 and HO • are the predomination reactive species for the toluene degradation in this coupled process, and the generation of O 3 in 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.