Sun Jinyan, Maimaiti Halidan, Zhai Peishuai, Zhang Haizheng, Feng Lirong, Bao Jianzhao, Zhao Xuwei
School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830046, Xinjiang, China.
Langmuir. 2022 Mar 15;38(10):3305-3315. doi: 10.1021/acs.langmuir.2c00163. Epub 2022 Mar 4.
Photocatalytic degradation of wastewater and the simultaneous production of hydrogen (H) is a green and efficient method to solve energy and environmental problems. In this paper, coal-based SiO/GO with a stable structure was prepared by a modified Hummers oxidation method, and then, a lotus-shaped composite photocatalyst, MoS/SiO/GO, was prepared by in situ loading of flower cluster MoS from sodium molybdate reduction onto SiO/GO. Its photocatalytic degradation of wastewater and H production properties were investigated while characterizing the material structure. The results show that SiO/GO as a carrier not only ensures adequate dispersion of MoS 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 MoS and act as an electron transport channel in composite catalysts. MoS/SiO/GO exhibits much higher photocatalytic degradation of wastewater and H production capacity than MoS: after 180 min of reaction, the CODcr removal of wastewater increased from 45.6% for MoS to 84.2% for MoS/SiO/GO and the H yield reached 233.4 μmol. The goal of degrading wastewater while producing H more economically has been tentatively achieved, although not to the extent required for industrialization.
光催化降解废水并同时制氢是解决能源和环境问题的一种绿色高效方法。本文采用改进的Hummers氧化法制备了结构稳定的煤基SiO/GO，然后通过将钼酸钠还原得到的花簇状MoS原位负载到SiO/GO上，制备了莲花状复合光催化剂MoS/SiO/GO。在对材料结构进行表征的同时，研究了其光催化降解废水及产氢性能。结果表明，SiO/GO作为载体不仅保证了MoS的充分分散，还增强了复合催化剂的可见光响应。此外，它还能阻碍MoS中光生电子和空穴的复合，并在复合催化剂中充当电子传输通道。MoS/SiO/GO表现出比MoS更高的光催化降解废水及产氢能力：反应180分钟后，废水的CODcr去除率从MoS的45.6%提高到MoS/SiO/GO的84.2%，产氢量达到233.4 μmol。虽然尚未达到工业化所需的程度，但已初步实现了更经济地降解废水同时制氢的目标。
