School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, China.
Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Chemosphere. 2022 Mar;290:133306. doi: 10.1016/j.chemosphere.2021.133306. Epub 2021 Dec 16.
By-product ozone emission is one of the challenges for applying dielectric barrier discharge (DBD) technology for volatile organic compounds (VOCs) removal. In this study, a DBD reactor followed by a wet scrubber (WS) containing a solution of metal ions (Fe/Mn/Cu) was used to reuse ozone for further oxidation of typical VOC toluene. Compared with the degradation effect of the DBD reactor alone, DBD coupled WS/iron system not only improved the toluene removal efficiency but also significantly reduced the ozone emission. The ozone removal efficiency reached as high as 98% in the DBD coupled WS/Fe system. Electron paramagnetic resonance (EPR) tests showed that ozone was converted into radicals such as hydroxyl radicals in Fe and Cu solution, which further oxidized toluene in WS/iron. Quenching experiments showed that the contribution for toluene degradation by radicals was up to 75% and 62% in Fe and Mn reactor, respectively. This study demonstrates that the DBD coupled WS system has the potential to be an environmentally friendly technology for gaseous VOCs removal.
副产物臭氧排放是应用介质阻挡放电（DBD）技术去除挥发性有机化合物（VOCs）的挑战之一。在这项研究中，使用了一种 DBD 反应器，随后是一个含有金属离子（Fe/Mn/Cu）溶液的湿式洗涤器（WS），以重新利用臭氧来进一步氧化典型的 VOC 甲苯。与单独的 DBD 反应器的降解效果相比，DBD 耦合 WS/铁系统不仅提高了甲苯去除效率，而且还显著减少了臭氧排放。在 DBD 耦合 WS/Fe 系统中，臭氧去除效率高达 98%。电子顺磁共振（EPR）测试表明，臭氧在 Fe 和 Cu 溶液中转化为羟基自由基等自由基，进一步在 WS/铁中氧化甲苯。猝灭实验表明，自由基对甲苯降解的贡献分别达到 75%和 62%在 Fe 和 Mn 反应器中。本研究表明，DBD 耦合 WS 系统有可能成为一种环保的气态 VOCs 去除技术。
