Department of Chemical Engineering, McGill University, 3610 Rue University, Montréal, QC H3A 0C5, Canada.
Department of Chemical Engineering, Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, QC H3T 1J4, Canada; Canada Research Chair in Engineering Process Intensification and Catalysis (EPIC), Department of Chemical Engineering, Polytechnique Montréal, 2500 Chemin de Polytechnique, Montréal, QC H3T 1J4, Canada.
Sci Total Environ. 2022 Oct 15;843:157006. doi: 10.1016/j.scitotenv.2022.157006. Epub 2022 Jun 30.
This research evaluates photocatalytic ozonation for removing 5 PFAS (PFOA/PFHxS/PFBS/6:2 FTS/GenX) from water using a WO/TiO catalyst under UVA-visible radiation. Four catalysts of varying WO content (0/1/3/5 wt%) were synthesized by sol-gel and characterized by XRD, TEM, STEM-EDS, HAADF-STEM, adsorption/desorption N isotherms, and DRS-UV-vis. 5 wt% WO/TiO was the optimal composition based on physicochemical properties and photocatalytic activity tests with methylene blue. PFAS degradation showed that photocatalytic ozonation inefficiently degraded PFAS with WO/TiO under UVA-visible light after 4 h (ΣPFAS removal 16 %, [range 4 %-26 %]). Photocatalysis had comparable removal to photocatalytic ozonation, photolysis and ozone photolysis showed lower removal, and ozonation had no effect. Microtox analysis showed the initial acute toxicity was no longer detectable after photocatalysis and photocatalytic ozonation treatment. Low PFAS removals under tested conditions require that future work evaluate different catalysts or treatment conditions, while disparities between tested PFAS removals demonstrate the need to evaluate multiple compounds. ENVIRONMENTAL IMPLICATION: The research presented in this manuscript involves the preparation and characterization of WO/TiO catalysts used, for the first time, to remove multiple PFAS in water via photocatalytic ozonation. This manuscript supports the development of a catalytic process for the elimination of hard to degrade environmental pollutants, provides new knowledge on aspects of photocatalytic processes, and provides insights on environmental pollution abatement.
本研究采用 WO/TiO 催化剂，在 UVA-可见光辐射下，评估光催化臭氧化去除水中的 5 种全氟和多氟烷基物质（PFOA/PFHxS/PFBS/6:2 FTS/GenX）。合成了四种不同 WO 含量（0/1/3/5wt%）的催化剂，通过 XRD、TEM、STEM-EDS、HAADF-STEM、吸附/解吸 N 等温线和 DRS-UV-vis 进行了表征。基于物理化学性质和亚甲基蓝的光催化活性测试，5wt%WO/TiO 是最佳组成。PFAS 降解结果表明，在 4 小时内，WO/TiO 在 UVA-可见光下的光催化臭氧化对 PFAS 的降解效率较低（ΣPFAS 去除率为 16%，[范围为 4%-26%]）。光催化与光催化臭氧化具有相当的去除效果，光解和臭氧光解的去除效果较低，而臭氧化则没有效果。微毒分析表明，光催化和光催化臭氧化处理后，初始急性毒性不再可检测。在测试条件下，PFAS 的低去除率要求未来的工作评估不同的催化剂或处理条件，而测试的 PFAS 去除率之间的差异表明需要评估多种化合物。环境影响：本研究首次采用 WO/TiO 催化剂用于水中多种 PFAS 的光催化臭氧化去除，制备并表征了 WO/TiO 催化剂。本文支持开发用于消除难降解环境污染物的催化工艺，为光催化过程的各个方面提供了新知识，并为减少环境污染提供了新的见解。
