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通过溶胶-凝胶法制备了不同掺杂量的丝素蛋白/TiO2复合纳米材料,并研究了其可见光催化活性.用粒度分析、X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis-DRS)、平带电位、Zeta-电位、元素分析等方法表征了所制备的催化剂样品.结果显示,在可见光照射下,反应2 h时,丝素蛋白/TiO2-400℃的Cr(VI)光催化还原效率达36%,甲酸降解效率达3.4%;相对纯TiO2,丝素蛋白/TiO2的可见光吸收能力均有提高,以丝素蛋白/TiO2-400℃的增幅最大;相对纯TiO2,丝素蛋白/TiO2的平带电位均有不同程度负移,这意味着光生电子有了更强的还原能力;TiO2-400℃、素蛋白/TiO2-300℃、丝素蛋白/TiO2-400℃、丝素蛋白/TiO2-500℃的Zeta-电位值分别为29、31、36、33 mV,说明丝素蛋白/TiO2-400℃在水中形成的溶胶系统分散程度最高.
Silk fibroin / TiO2 composite nanomaterials with different doping amount were prepared by sol-gel method and their photocatalytic activities were studied. The effects of particle size distribution, X-ray diffraction (XRD), UV-visible diffuse reflectance Vis-DRS, Zeta potential and elemental analysis were used to characterize the prepared catalyst samples. The results showed that under visible light irradiation for 2 h, ) Photocatalytic reduction efficiency of 36%, formic acid degradation efficiency of 3.4%; relative pure TiO2, silk fibroin / TiO2 visible absorption increased, with silk fibroin / TiO2-400 ℃ increase the most; relatively pure TiO2, The flat potential of silk fibroin / TiO2 all negatively shifted to different extents, which means the photogenerated electron had a stronger reducing ability; TiO2-400 ℃, protein / TiO2-300 ℃, silk fibroin / TiO2-400 ℃ , Zeta-potential values of silk fibroin / TiO2-500 ℃ were 29,31,36,33 mV, respectively, indicating that silk fibroin / TiO2-400 ℃ formed the highest degree of dispersion in water.