大豆蛋白改性TiO_2的制备及其可见光催化性能

采用溶胶-凝胶法制备了系列大豆蛋白改性TiO_2复合催化剂.通过元素分析、粒度分析、X射线衍射(XRD)、场发射扫描电镜(FESEM)、紫外-可见漫反射光谱(UV-Vis)、电化学等方法对所制备的样品进行了表征,以亚甲基蓝为目标降解物,研究了大豆蛋白改性TiO_2的可见光催化性能.结果表明,大豆蛋白改性可以一步实现C、N、H多种非金属元素共掺杂;相比纯TiO_2,改性后复合催化剂的比表面积增大;所有样品均为锐钛矿相;煅烧温度为400℃时,复合催化剂的可见光吸收发生明显红移,其禁带宽度较纯TiO_2窄化了0.32 e V;大豆蛋白改性后,复合材料的光电流密度增大;在可见光照射下,光催化反应2 h时,大豆蛋白改性TiO_2的亚甲基蓝降解效率最高可达79.4%.

Preparation and Visible-light Photocatalytic Activity of TiO2 Composite Catalyst Modified by Soy protein

A series of composite catalysts modified by soy protein were prepared by sol-gel method.The samples were characterized by Elemental analysis,Particles size analysis,X-ray diffraction (XRD),Field emission scan-ning electron microscopy (FESEM),UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS)and electrochemi-cal technology.The visible light-induced degradation of methylene blue (MB)assisted by the composite TiO2 was investigated.The results show that TiO2 is co-doped with C、N、H;compared with pure TiO2 ,the specific surface of modified composite catalyst is increased;all samples are anatase phase;when the calcinations temperature rea-ches 400 ℃,red shift can be obviously found in the visible light absorption of the composite catalyst,and the bandgap narrows by 0.32 eV than pure TiO2;after the modification of the soy protein,the photocurrent density of the composite material is increased;after 2 hours’irradiation of visible light,the degradation rate of methylene blue in the soy protein modified TiO2 can reach as high as 79.4%.