Preparation of a Coal-Based MoS₂/SiO₂/GO Composite Catalyst and Its Performance in the Photocatalytic Degradation of Wastewater and Hydrogen Production
2022
Sun, Jinyan | Maimaiti, Halidan | Zhai, Peishuai | Zhang, Haizheng | Feng, Lirong | Bao, Jianzhao | Zhao, Xuwei
Photocatalytic degradation of wastewater and the simultaneous production of hydrogen (H₂) is a green and efficient method to solve energy and environmental problems. In this paper, coal-based SiO₂/GO with a stable structure was prepared by a modified Hummers oxidation method, and then, a lotus-shaped composite photocatalyst, MoS₂/SiO₂/GO, was prepared by in situ loading of flower cluster MoS₂ from sodium molybdate reduction onto SiO₂/GO. Its photocatalytic degradation of wastewater and H₂ production properties were investigated while characterizing the material structure. The results show that SiO₂/GO as a carrier not only ensures adequate dispersion of MoS₂ but also enhances the visible-light response of the composite catalyst. In addition, it can also hinder the recombination of photogenerated electrons and holes in MoS₂ and act as an electron transport channel in composite catalysts. MoS₂/SiO₂/GO exhibits much higher photocatalytic degradation of wastewater and H₂ production capacity than MoS₂: after 180 min of reaction, the CODcr removal of wastewater increased from 45.6% for MoS₂ to 84.2% for MoS₂/SiO₂/GO and the H₂ yield reached 233.4 μmol. The goal of degrading wastewater while producing H₂ more economically has been tentatively achieved, although not to the extent required for industrialization.
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