高光催化性能的二氧化钛纳米管-氧化石墨烯杂化材料

摘要

Titania nanotube-graphene oxide( TiO2 NT-GO) hybrids were prepared by a hydrothermal reaction followed by calcina-tion at different temperatures. Results indicate that flat sheets of GO promote the formation of the TiO2 NTs. GO is reduced during the hydrothermal and calcination steps, and is inserted into the TiO2 layers by the interaction between oxygen-containing groups on both the GO and TiO2 . The rates of GO decomposition, GO reduction and TiO2 NT formation are temperature dependent. The TiO2 NT-GO hybrid calcined at 350℃ has a high degree of crystallization, a red-shifted absorption and the highest observed photocatalyt-ic activity for the degradation of methylene blue.%以金红石型TiO2、氧化石墨烯和氢氧化钠为反应剂，通过水热合成法制备了TiO2纳米管-氧化石墨烯复合材料，并研究复合材料制备过程中水热温度、煅烧温度对制备材料结构性能的影响关系。结果发现， TiO2纳米管-氧化石墨烯复合材料比纯TiO2纳米管具有更好的光催化性能。石墨烯有利于TiO2纳米管的形成，而且存在一个优化的加强光催化性性能的煅烧温度。 TiO2纳米管-氧化石墨烯复合材料在煅烧过程中，氧化石墨烯的还原与逐渐损失同TiO2纳米管的结晶动态平衡，可能是其中存在优化煅烧温度的原因。同时分析了TiO2纳米管-氧化石墨烯复合新材料的复合机理。