TiO2柱撑蒙脱土的制备及其对品红降解的催化反应  

Preparation of TiO_2 Pillared Montmorillonite Photocatalyst and Its Photocatalytic Activity to Degradation Reaction of Acidic Fuchsine by Sunlight

作　　者：杨武[1] 成莉燕[1] 薛再兰[1] 郭昊[1] 高锦章[1] 

机构地区：[1]西北师范大学化学化工学院,生态环境相关高分子材料教育部重点实验室,甘肃兰州730070

出　　处：《光谱学与光谱分析》2008年第5期1122-1125,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20475044);教育部优秀青年教师资助计划资助

摘　　要：基于TiO2光催化剂的优良光催化活性,采用酸性溶胶法合成了TiO2柱撑蒙脱土复合光催化剂,利用IR,UV-Vis,TG/DTA,XRD及SEM等手段对复合催化剂进行了表征,通过太阳光对酸性品红光催化降解实验,考察了催化剂的光催化活性。该催化剂比纳米TiO2对酸性品红的光催化降解反应表现出更高的催化活性,而且更易于沉降、回收。当TiO2柱撑蒙脱土光催化剂的用量为0.2 g.(100 mL)-1,酸性品红溶液的pH值为3时,在太阳光下40 min内酸性品红基本降解完全,而且该降解过程符合Langmuir-Hin-shelwood方程。X射线衍射(XRD)分析表明钛柱撑蒙脱土的层间距较钠基蒙脱土有明显的增大,紫外-可见吸收光谱表明TiO2柱撑蒙脱土比纳米TiO2具有更高的光吸收效率。TiO2 pillared montmorillonite composite photocatalyst was synthesized by acid-catalyzed sol method and characterized by IR, UV-Vis, TG/DTA, XRD, SEM etc. Spectral analyses have demonstrated that TiO2 pillared montmorillonite（Ti-MMT） has wider interlayer distance than Na substituted montrnorillonite（Na-MMT） and higher optical absorption efficiency than nanoscale anatase TiO2. The photocatalytic degradation reaction of acidic fuchsine by sunlight was employed to evaluate the catalytic activity of the composite catalyst. It was found that, besides easy reclaimation, the photocatalytic activity of the catalyst was much higher than that of the pure nanosized anatase TiO2. When the addition amount of Ti-MMT is 0. 2 g · （100 mL）-1 and pH of acidic fuchsine solution is 3, the dye could be degraded thoroughly in 40 min and the degradation reaction obeys Langmuir- Hinshelwood equation.

关 键 词：蒙脱土 TO2 柱撑 酸性品红 光催化 降解 

分 类 号：O643[理学—物理化学]