Optimization of Co3O4 surface sites for photo-ozone catalytic mineralization of dichloromethane

Obtaining high removal rate of chlorinated volatile organic compounds (CVOCs) and CO2 selectivity with a low ratio of O3/CVOC and energy consumption is challenging. Dodecylamine was used in this study to create active sites on Co3O4 for photo-ozone catalytic mineralization of dichloromethane (DCM)....

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Veröffentlicht in:Journal of hazardous materials 2023-06, Vol.452, p.131275-131275, Article 131275
Hauptverfasser: Chang, Baolin, Cao, Tiannan, Shen, Zhizhang, Zhang, Yipu, Wang, Zhenyu, Li, Ji, Lyu, Jinze
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Sprache:eng
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Zusammenfassung:Obtaining high removal rate of chlorinated volatile organic compounds (CVOCs) and CO2 selectivity with a low ratio of O3/CVOC and energy consumption is challenging. Dodecylamine was used in this study to create active sites on Co3O4 for photo-ozone catalytic mineralization of dichloromethane (DCM). Amine-Co3O4-450 is a dodecylamine-modified sample with high density of Co3+, Co2+, and hydroxyl due to its nanosheet structure and exposed (112) facets. The optimized surface significantly enhanced the cleavage of the C–Cl bond at low temperatures. Photocatalysis primarily participated in the oxidation of intermediates following DCM dichlorination and significantly improved CO2 selectivity. The respective DCM removal rate and mineralization efficiency of Amine-Co3O4-450 with an O3/DCM molar ratio of 1.27 and one-sun irradiation were 14.9 and 15.0 times higher than the sum of those in the presence of light irradiation or O3 alone. This finding indicated that a strong synergistic effect exists between O3 and light. [Display omitted] •Dodecylamine induced Co3O4 to form exposed (112) facets•Amine-Co3O4-450 achieved a high performance with low a O3/dichloromethane ratio•High density of acid sites facilitated the cleavage of C-Cl•Photocatalysis significantly enhanced CO2 selectivity•Light and O3 revealed a strong synergistic effect on Co3O4
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2023.131275