部分还原氧化石墨烯／二氧化钛复合材料的水热合成及其光催化活性

Hydrothermal Synthesis and Photocatalytic Activity of Partially Reduced Graphene Oxide/TiO_2 Composite

采用水热法以Hummers氧化法制备的氧化石墨和钛酸四丁酯为原料制备了部分还原的氧化石墨烯/二氧化钛(RGO/TiO2)复合光催化剂,并研究了该复合材料在可见光以及紫外光下对亚甲基蓝的光催化降解活性.结果表明,通过改变反应温度和氧化石墨加入量可以调控TiO2的晶相组成及其在复合材料中的分散性;在水热反应过程中氧化石墨烯发生了部分还原;所制备的RGO/TiO2复合材料的可见光和紫外光催化活性均高于纯TiO2;部分还原的氧化石墨烯在复合材料中担当载体和电子受体,同时可以使TiO2的初始吸收边向可见光区域红移,增强了TiO2在可见光区域的吸收,能有效提高对目标污染物的吸附性和光催化降解活性.

Partially reduced graphene oxide/titanium dioxide （RGO/TiO2） composite was synthesized using tetrabutyl titanate and graphite oxide by a hydrothermal method. Photocatalytic activity of the material was evaluated by the degradation of methylene blue solution under visible light and UV light. The results suggest that the crystal phase and dispersion of titanium oxide in the composite can be controlled by varying the reaction temperature and amount of graphite oxide. Graphene oxide was partially reduced in the hydrothermal reaction process. Photocatalytic activities of partially reduced graphene oxide/titanium dioxide composites under both visible and UV light irradiation were higher than those of pure TiO2. Partially reduced graphene oxide may act as a support and electron acceptor, and can also extend and enhance the band edge absorption of TiO2 into the visible light region, hence effectively enhancing the adsorbability and photocatalytic activity of TiO2.