摘要
采用酸催化的溶胶-凝胶法制备了一系列Cr3+掺杂TiO2/凹凸棒(Cr3+-TiO2/ATP)复合光催化剂材料。在可见光条件下,以亚甲基蓝(MB)溶液的光催化降解反应,评价了样品的光催化性能。采用正交实验设计,用正交表L16(44)安排实验,优化了复合光催化剂制备条件,得到了影响复合材料吸附性能和光催化性能诸因素的排列次序和各因素的最佳条件,基于降低能耗和原料加入量的考虑和综合分析的基础上,得到了制备高活性复合光催化材料的较优工艺条件。对比实验结果表明,MB在复合材料上的光催化降解反应遵循Langmuir-Hinshelwood动力学模型,在较优工艺条件下制备的掺Cr3+复合光催化剂对MB的光催化降解效率最佳,优于未掺杂样品的,且远优于P25和纯TiO2。另外,复合材料的沉降性能优于P25和纯TiO2,易于分离,是一类有应用前景的复合光催化剂。
Cr^3＋ doped TiO2/attapulgite composite photocatalyst（Cr^3＋-TiO2/ATP）were synthesized by the acid-catalyzed sol-gel method.Their photocatalytic activity was evaluated by degrading methylene blue（MB）solution under visible light irradiation.Orthogonal experiments were employed to optimize the conditions for preparation of composite photocatalyst according to the orthogonal layout L16（44）.Therefore,the orders of effectiveness of every factor which could affect absorption ability under dark and the photocatalytic activity under visible light of composite photocatalyst were found out and their optimal conditions were determined.Moreover,based on the thoughts of reduced energy consumption and comprehensive analysis of the experiment results,the optimal conditions for preparing composite photocatalyst with higher activity were determined.The results of photocatalytic experiments showed that the degradation of MB on the composite photocatalysts followed the Langmuir-Hinshelwood（L-H）first-order reaction model,and the Cr^3＋-TiO2/ATP photocatalysts prepared under optimal conditions exhibited higher photocatalytic activity on degradation of MB,and the photocatalytic activity was much higher than that of TiO2/ATP,P25 and pure TiO2.Furthermore,the composite photocatalyst showed easy separation property compared with P25 and pure TiO2.The advantages of composite photocatalyst revealed its potential applications in wastewater treatment.
出处
《化学试剂》
CAS
CSCD
北大核心
2010年第5期443-447,共5页
Chemical Reagents
基金
河西学院西部资源环境化学重点实验室基金资助项目(XZ0706)
