3D多级孔rGO/TiO_(2)复合材料的构筑及其光催化性能研究

Construction and Photocatalytic Performance of 3D Hierarchical Pore rGO/TiO_(2) Composites

研究以聚苯乙烯(PS)微球为模板、氧化石墨烯(GO)和钛酸四丁酯(TBT)为原料,采用溶胶–凝胶法,利用GO与PS上的官能团和TiO_(2)前驱体的多重配位反应,制备了3D多级孔rGO/TiO_(2)(PS)复合材料。通过不同手段对样品的结构和形貌进行表征,研究了PS添加量对rGO/TiO_(2)复合材料晶体结构、微观形貌及光催化性能的影响。分别在模拟紫外光和可见光下,以盐酸四环素(TTCH)为目标污染物对不同PS加入量制备的3D多级孔rGO/TiO_(2)(PS)复合材料的光催化性能进行评价,并在模拟可见光下,对3D多级孔rGO/TiO_(2)(5wt%PS)复合材料进行了多次循环回收测试。结果表明:rGO/TiO_(2)(PS)复合材料具有3D多级孔块体结构,GO作为基体的增强相通过Ti–O–C键保持多级孔刚性骨架结构的稳定。引入PS增大了rGO/TiO_(2)(PS)复合材料的比表面积,3D多级孔rGO/TiO_(2)(7wt%PS)复合材料对TTCH吸附效率最高,而3D多级孔rGO/TiO_(2)(5wt%PS)复合材料光催化活性和稳定性最高,且经过4次循环回收测试,其光催化效率仍达81.02%;模板剂PS的最佳引入量为5wt%。

Utilizing polystyrene(PS)microspheres as templates,and graphene oxide(GO)and tetrabutyl titanate(TBT)as raw materials,3D hierarchical pore rGO/TiO_(2)(PS)composites were fabricated by Sol-Gel method based on multiple coordination reactions.The structure and morphology of 3D hierarchical pore rGO/TiO_(2)(PS)composites were characterized,and the effects of PS addition on crystal structure,microscopic morphology and photocatalytic performance of rGO/TiO_(2)composites were studied.Under simulate ultraviolet light and visible light irradiation,tetracycline hydrochloride(TTCH)using as the target pollutant,the photocatalytic performance of 3D hierarchical pore rGO/TiO_(2)(PS)composites prepared with different PS addition was evaluated.Under simulated visible light irradiation,the 3D hierarchical pore rGO/TiO_(2)(5wt%PS)composites were subjected to multiple recycling tests.The results show that the rGO/TiO_(2)(PS)composites have a 3D hierarchical pore bulk structure.As the reinforcing phase of matrix,GO keeps stability of multistage pore rigid skeleton structure through Ti-O-C bond.Furthermore,the introduction of PS increases the specific surface area of the rGO/TiO_(2)(PS)composites.The 3D hierarchical pore rGO/TiO_(2)(7wt%PS)composite has the highest adsorption efficiency for TTCH,while the 3D hierarchical pore rGO/TiO_(2)(5wt%PS)composite has the highest photocatalytic activity and stability,which photocatalytic efficiency still reaches 81.02%after 4 cycles of recycling tests;the best addition amount of template PS is 5wt%.