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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%.
A series of soybean protein modified TiO 2 composite catalysts were prepared by sol-gel method. The effects of elemental composition, particle size distribution, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy , And electrochemical methods were used to characterize the prepared samples. Methylene blue as the target degradation product was used to study the visible light photocatalytic activity of soybean protein modified TiO_2. The results showed that the modification of soybean protein can achieve a variety of C, N, H Compared with pure TiO 2, the specific surface area of the composite catalyst increases; all the samples are anatase phase; when the calcination temperature is 400 ℃, the visible light absorption of the composite catalyst shows a significant red shift, The band gap is narrower than that of pure TiO_2 by 0.32 eV. The photocurrent density of the composite increases with the modification of soybean protein. Under the visible light irradiation, the degradation efficiency of methylene blue by soybean protein modified TiO_2 is the highest Up to 79.4%.