| 谢艳招.丝素蛋白/TiO2复合催化剂的制备及其可见光催化性能[J].分子催化,2014,(3):275-281 |
| 丝素蛋白/TiO2复合催化剂的制备及其可见光催化性能 |
| Preparation and Visible Light Photocatalytic Activity of Silk fibroin / TiO2 Nanocomposite |
| 投稿时间：2013-08-23 修订日期：2014-03-30 |
| DOI： |
| 中文关键词: 丝素蛋白 二氧化钛 X射线衍射 紫外-可见光谱 平带电位 |
| 英文关键词:silk fibroin, titanium dioxide, X-ray diffraction, UV-Vis spectra, flat band potential |
| 基金项目:福建省教育厅科技类项目,福建师范大学闽南科技学院青年骨干教师培养基金项目 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| A series of silk fibroin/TiO2 nanocomposites were prepared by sol-gel method in different doping amount. Their visible light photocatalytic activities were also investigated. The samples were characterized by Particles size analysis, X-ray diffraction (XRD), UV-visible (UV-Vis) diffuse reflectance spectroscopy, Flat band potentials, Zeta–potentials and element analysis, respectively. The results show that, the visible light photocatalytic reduction efficiency for Cr (VI) and visible light photocatalytic degradation efficiency for HCOOH of silk fibroin/TiO2-400 ℃ nanocomposite are 36% and 3.4% respectively when reaction time is 2 h. The visible light absorbilities of silk fibroin/TiO2 nanocomposites are stronger than the pure TiO2, and the strongest visible light absorbility is detected on silk fibroin/TiO2 – 400 ℃. Compared with pure TiO2, the flat band potentials of silk fibroin/TiO2 nanocomposites shift negatively to different degree, which indicates that the reductive capabilities of photoinduced electrons become stronger. The Zeta–potentials of TiO2-400 ℃, silk fibroin/TiO2-300 ℃, silk fibroin/TiO2-400 ℃ and silk fibroin/TiO2-500 ℃ are 29, 31, 36 and 33 mV, respectively. It shows that the dispersion of sol-gel system, which is formed by silk fibroin/TiO2-400 ℃ in water, is highest. |
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