【摘要】 石墨烯协同TiO₂光催化降解有机物是一种很有前景的解决水体污染问题的方法。本文以低成本煤炭作为石墨烯碳源，成功地制备了TiO₂-石墨烯复合催化剂。利用扫描电子显微镜、原子力显微镜、X射线衍射仪和拉曼光谱仪等研究了TiO₂-石墨烯复合催化剂的微观结构和形貌。煤基石墨烯的引入促进了TiO₂光催化降解有机物的反应。特别是在水热还原法制备的TiO₂-石墨烯催化剂中，TiO₂堆积在石墨烯片层结构上形成层状结构。由于石墨烯的引入，复合催化剂表现出良好的导电性和光电响应特性，并展示出较高的光催化活性。更多还原

【Abstract】 Graphene oxide（GO） obtained from coal-based graphite by the Hummers method was hydrothermally treated to obtain reduced GO（rGO）. TiO₂ was mixed with aqueous suspensions of GO and rGO and dried at 70 o C to obtain GO-TiO₂ and rGOTiO₂ with 95%（mass fraction） TiO₂. TiO₂ was also combined with a GO suspension by hydrothermal treatment to obtain rGO-hTiO₂with 95% TiO₂. The three hybrids were used as catalysts for the photocatalytic degradation of rhodamine B（Rh B） and methyl orange（MO）. Of the three materials, rGO-hTiO₂ had the highest catalytic activity for the degradation of Rh B and MO under visible light irradiation. The reasons for having the best catalytic activity are that the incorporation of rGO into TiO₂ helps increase its adsorption capacities for Rh B and MO as evidenced by adsorption in dark, and a narrowing of the TiO₂ band gap as revealed by diffuse UV reflectance spectroscopy. This reduces the rate of recombination of electron–hole pairs by there being intimate contact between the TiO₂ particles and rGO, forming Ti-O-C bonds as confirmed by XPS, with the TiO₂ particles being uniformly decorated on the rGO sheets.更多还原