Optimization of Co 3 O 4 surface sites for photo-ozone catalytic mineralization of dichloromethane

Obtaining high removal rate of chlorinated volatile organic compounds (CVOCs) and CO selectivity with a low ratio of O /CVOC and energy consumption is challenging. Dodecylamine was used in this study to create active sites on Co O for photo-ozone catalytic mineralization of dichloromethane (DCM). Amine-Co O -450 is a dodecylamine-modified sample with high density of Co , Co , 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 CO selectivity. The respective DCM removal rate and mineralization efficiency of Amine-Co O -450 with an O /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 O alone. This finding indicated that a strong synergistic effect exists between O and light.