GO物理形态对复合光催化剂性能的影响

摘要

Composite photocatalysts (TiO2-RGO (s) and TiO2-RGO (l)) have been prepared,respectively,using tetrabutyl titanate and solid state and liquid state graphene oxide (GO) as predecessors. Two kinds of prepared composite photocatalysts are characterized. Taking methylene blue(MB) as the target,the photocatalytic effect of the two kinds of composite photocatalysts are compared and studied. The results show that the energy level broad bands of TiO2-RGO(l) and TiO2-RGO(s) are decreased to 2.8 eV and 2.9 eV,respectively. The efficiency of both photo-degradation of MB are better than TiO2 itself. Furthermore,the degradation efficiency increases with the increase of GO content. When the mass ratio of TiO2 and GO is 1∶0.06,the degradation rates of MB by TiO2-RGO(l) and TiO2-RGO(s) are 96%and 84%,respectively. The kinetics research shows that the pseudo first-order reaction rate cons-tants of TiO2-RGO(l) and TiO2-RGO(s) are 3.2 and 2.2 times as much as TiO2,respectively.%以钛酸四丁酯以及固态和液态的氧化石墨烯（GO）为前驱物，分别制备了标记为TiO2-RGO（s）和TiO2-RGO（l）的复合光催化剂。对制备的2种复合光催化剂进行了表征，并以亚甲基蓝（MB）为目标物，对比研究了2种催化剂的光催化效能。结果表明，TiO2-RGO（l）和TiO2-RGO（s）的能级带宽分别降低至2．8、2．9 eV；二者光降解MB的效能均优于TiO2自身，且降解效率随着GO含量的增加而增加；当TiO2与GO的质量比为1∶0．06时，TiO2-RGO（l）和TiO2-RGO（s）对MB的降解率分别为96%和84%。动力学研究表明：TiO2-RGO（l）和TiO2-RGO（s）的准一级反应速率常数分别是TiO2的3．2倍和2．2倍。