School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China.
Chemosphere. 2022 Nov;307(Pt 4):136193. doi: 10.1016/j.chemosphere.2022.136193. Epub 2022 Aug 26.
Wet scrubbing is a low-cost process for disposing of air pollutants. Nevertheless, this method is rarely used for the treatment of volatile organic compounds (VOCs) because of their poor water solubility. In this study, we used a unique wet scrubbing system containing HO and activated carbon (AC)-supported iron oxychloride (FeOCl) nanoparticles to remove airborne dichloroethane (DCE). The operating conditions of the wet scrubber were optimized, and the mechanism was explored. The results showed that the adsorption of dissolved DCE onto AC promoted its transfer from air to water, while the accumulation of DCE on AC facilitated its oxidation by •OH generated on FeOCl catalyst. The wet scrubber performed well at pH 3 and low HO concentrations. By pulsed or continuous dosing HO, the cooperative adsorption-catalytic oxidation allowed long-term DCE removal from air. Benefiting from satisfactory cost-effectiveness, avoidance of toxic byproduct formation, and less corrosion and catalyst poisoning, wet scrubbers coupled with cooperative adsorption and heterogeneous advanced oxidation processes could have broad application potentials in VOC control.
湿法洗涤是一种低成本处理空气污染物的方法。然而，由于挥发性有机化合物（VOC）的水溶性差，因此很少将该方法用于处理 VOC。在这项研究中，我们使用了一种独特的湿法洗涤系统，其中包含 HO 和活性炭（AC）负载的氧化铁（FeOCl）纳米颗粒，以去除空气中的二氯乙烷（DCE）。优化了湿法洗涤器的操作条件，并探讨了其机制。结果表明，溶解的 DCE 在 AC 上的吸附促进了其从空气向水的转移，而 DCE 在 AC 上的积累则促进了其在 FeOCl 催化剂上生成的 •OH 的氧化。湿法洗涤器在 pH 3 和低 HO 浓度下表现良好。通过脉冲或连续加 HO，可以实现协同吸附-催化氧化，从而实现空气中 DCE 的长期去除。湿法洗涤器与协同吸附和多相高级氧化过程相结合，具有良好的成本效益、避免有毒副产物形成、腐蚀性和催化剂中毒较小等优点，在 VOC 控制方面具有广阔的应用潜力。
