Advanced oxidation process (AOP) wet scrubber is a powerful and clean technology for organic pollutant treatment but still presents great challenges in removing the highly toxic and hydrophobic volatile organic compounds (VOCs). Herein, we elaborately designed a bifunctional cobalt sulfide (CoS₂)/activated carbon (AC) catalyst to activate peroxymonosulfate (PMS) for efficient toxic VOC removal in an AOP wet scrubber. By combining the excellent VOC adsorption capacity of AC with the highly efficient PMS activation activity of CoS₂, CoS₂/AC can rapidly capture VOCs from the gas phase to proceed with the SO₄^•– and HO^• radical-induced oxidation reaction. More than 90% of aromatic VOCs were removed over a wide pH range (3–11) with low Co ion leaching (0.19 mg/L). The electron-rich sulfur vacancies and low-valence Co species were the main active sites for PMS activation. SO₄^•– was mainly responsible for the initial oxidation of VOCs, while HO^• and O₂ acted in the subsequent ring-opening and mineralization processes of intermediates. No gaseous intermediates from VOC oxidation were detected, and the highly toxic liquid intermediates like benzene were also greatly decreased, thus effectively reducing the health toxicity associated with byproduct emissions. This work provided a comprehensive understanding of the deep oxidation of VOCs via AOP wet scrubber, significantly accelerating its application in environmental remediation.

中文翻译：

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使用双功能硫化钴/活性炭催化剂通过高级氧化工艺湿式洗涤有效催化消除有毒挥发性有机化合物


高级氧化工艺（AOP）湿式洗涤器是一种强大且清洁的有机污染物处理技术，但在去除高毒性和疏水性挥发性有机化合物（VOC）方面仍然面临着巨大的挑战。在此，我们精心设计了一种双功能硫化钴（CoS ₂ ）/活性炭（AC）催化剂来活化过一硫酸盐（PMS），以在AOP湿式洗涤器中有效去除有毒VOC。通过将AC优异的VOC吸附能力与CoS ₂ 高效的PMS活化活性相结合，CoS ₂ /AC可以快速捕获气相中的VOC，以进行SO < b3> ^•– 和 H2O ^• 自由基引发的氧化反应。超过 90% 的芳香族 VOC 在较宽的 pH 范围 (3-11) 内以低 Co 离子浸出量 (0.19 mg/L) 被去除。富电子硫空位和低价Co物种是PMS激活的主要活性位点。 SO ₄ ^•– 主要负责 VOCs 的初始氧化，而 HO ^• 和 O ₂ 则在后续开环中起作用和中间体的矿化过程。未检测到VOC氧化产生的气态中间体，苯等剧毒液体中间体也大幅减少，有效降低了副产物排放对健康的毒性。这项工作全面了解了AOP湿式洗涤器对VOCs的深度氧化，显着加速了其在环境修复中的应用。