二氧化钛/还原氧化石墨烯复合材料的制备及其光催化降解脱色性能

为比较二氧化钛/ 还原氧化石墨烯(TiO2 / rGO)复合材料和TiO2 的光催化降解脱色性能，以钛酸丁酯为前驱体，采用水热法制备了不同晶型的TiO2 和TiO2 / rGO 复合材料，借助紫外漫反射吸收光谱仪、傅里叶红外光谱仪、拉曼光谱仪、X 射线衍射仪和扫描电子显微镜等对TiO2 及其复合材料进行表征。分析混晶TiO2 和混晶TiO2 / rGO复合材料对活性红3BS 染料废水的降解脱色效果。结果表明：在150 ℃水热12 h，再经过650 ℃煅烧4 h 后，可制得锐钛矿型和金红石型同时存在的混晶TiO2 体系；在碱性条件下，于140 ℃水热72 h，不经过煅烧可制得较为纯净的板钛矿型TiO2；锐钛矿型和金红石型混晶结构TiO2 体系对染料有一定的降解脱色效果，混晶TiO2 / rGO 复合材料降解染料120 min 后，降解脱色率高达99%。

Preparation and photocatalytic degradation decoloringof TiO2 / reduced graphene oxide composites

In order to compare the photocatalytic degradation decoloring performance of TiO2 / reduced graphene oxide (rGO) composites and TiO2, TiO2 of different crystal forms and TiO2 / rGO composites were prepared by the hydrothermal method using tetrabutyl titanate as a precursor. TiO2 and TiO2 / rGO composites were characterized by ultraviolet diffuser, Fourier transform infrared spectroscopy, Raman spectrography, X-ray diffractometer, scanning electron microscope and so on. The degradation decoloring effect of Reactive Red 3BS dye by mixed crystal TiO2 and mixed crystal TiO2 / rGO composites were analyzed. The results show that mixed crystal TiO2 with coexisting anatase and rutile can be prepared under of hydrothermal reaction at 150 ℃ for 12 h and calcination at 650 ℃ for 4 h. Under alkaline conditions, pure brookite TiO2 can be prepared under hydrothermal reaction at 140 ℃ for 72 h without calcination. Mixed crystal TiO2 with coexisting anatase and rutile has certain degradation decoloring effect on Reactive Red 3BS dye. The degradation decoloring rate of mixed crystal TiO2 / rGO composites is up to 99% after 120 min.