The effect of interlayer water of metal-modified montmorillonite for catalytic ozonation

• Published in: Chemosphere (Oxford) Vol. 312; no. Pt 1; p. 137200
• Main Authors: Wen, Yingjie, Chen, Xu, Su, Linfeng, Dong, Shuqian, Yi, Li, He, Peilei, Yang, Wen, Lu, Zhiyi
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2023
• Subjects: Atrazine - chemistry; Bentonite; Catalysis; Catalytic ozonation; Interlayer water; Metal-modified montmorillonite; Metals; Ozone - chemistry; Tandem Mass Spectrometry; Water; Water Pollutants, Chemical - analysis; Water Purification; Catalytic ozonation; Interlayer water; Metal-modified montmorillonite
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.137200

The catalytic ozonation-based advanced oxidation process (AOP) is applied to remove nondegradable chemical oxygen demand (COD), while the application in industry is limited by the economics and activity of catalysts. In this study, we demonstrate that by taking atrazine (ATZ) as a model pollutant, the removal rates of catalytic ozonation were negatively correlated with the interlayer water content of metal-modified montmorillonite (Mx@MMT), instead of the loadings metals. Among the modified MMT, Zn0.1@MMT achieved 83.2% degradation of ATZ within 15 min, and corresponding removal rates of COD and total organic carbon (TOC) reached 40.3% and 46.5%, respectively. Detailed EPR and quenching experiments identified that hydroxyl radicals (HO•) were the main reactive oxygen species and QTOF/MS/MS analysis helped to propose a possible degradation pathway of ATZ. Moreover, the catalytic performance of Zn0.1@MMT under different conditions was also systematically evaluated. [Display omitted] •The catalytic activity was negatively correlated with the interlayer water content.•The Zn0.1@MMT showed high performance of ATZ degradation.•The mechanism of ATZ degradation was elucidated.•The Zn0.1@MMT showed excellent stability and wide applicability.