![sio2 xps peak sio2 xps peak](https://cdnsciencepub.com/cms/10.1139/cjc-2015-0017/asset/images/large/cjc-2015-0017f3.jpeg)
Noble metals and transitional metal oxides are common catalysts for heterogeneous reactions including decomposition of ozone ( Nikolov et al., 2010 Gong et al., 2017 Deng et al., 2019 Tao et al., 2021a Tao et al., 2021b). Catalytic decomposition is considered to be one of the most feasible and effective methods for ozone removal ( Li et al., 2020).
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There are four common treatment methods to eliminate ozone: activated carbon ( Yu et al., 2020) absorption ( Yang et al., 2017) thermal decomposition and catalytic decomposition ( Gopi et al., 2017 Ma et al., 2017 Gong et al., 2018). The development of environmental technologies to effectively eliminate ozone is therefore necessary. Indoor ozone is considered more harmful than outdoor ozone because modern humans spend most of their time indoors ( Abbass et al., 2017 Namdari et al., 2021 Nazaroff and Weschler 2021). Ozone in the outdoor air can infiltrate into indoor environments. Ozone concentrations in the atmosphere near ground level have considerably increased in recent years due to increased levels of volatile organic compounds and nitrogen oxides ( Ou et al., 2016). The maximum eight-hour average concentration of ozone allowed by the World Health Organization is 100 μg/m 3. However, even low concentrations of ozone are harmful to human health, especially to the eyes, nose, and throat ( Ferrara et al., 2020 Ferrara et al., 2021). Ozone is widely used in food, medicine, and waste treatment owing to its excellent oxidizing ability ( Alameddine et al., 2021 Kim et al., 2022). This research provides important guidance for the high humidity resistance of catalysts for ozone decomposition. The superiority of Co 3O 2 is ascribed to its structure, in which Co 3O 4 is wrapped inside the SiO 2 shell structure to avoid air exposure. At 60% relative humidity and a space velocity of 720,000 h −1, the prepared Co 3O 2 obtained 95% ozone decomposition for 40 ppm ozone after 6 h, which far outperformed that of the 25wt% Co 3O 4/SiO 2 catalysts. In this study, Co 3O 2 catalysts with a core-shell-like structure were synthesized following the hydrothermal method. 3School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng, ChinaĬo 3O 4 is an environmental catalyst that can effectively decompose ozone, but is strongly affected by water vapor.2Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, China.1School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China.Jingya Ding 1, Feng Cheng 2*, Zhen Meng 1, Yan Cao 1, Fennv Han 1, Dongbin Chen 1, Mingxiang Cao 1, Guolin Zhang 3, Jiahao Kang 1, Shuxiang Xu 1 and Qi Xu 1*