摘要
以钛酸丁酯、壳聚糖为原料,孔雀石绿为模板分子,用溶胶-凝胶法制备了孔雀石绿分子印迹的壳聚糖/纳米TiO2催化剂(MA-CHS/TiO2),在紫外灯照射下催化降解孔雀石绿等底物,考察了印迹型催化剂对孔雀石绿等底物的光催化降解性能,并与相关非印迹型体系作比较,利用傅里叶红外光谱(FTIR)、X射线粉末衍射(XRD)方法对其结构进行了表征.结果表明,印迹型催化剂具有明显的选择催化效应,在降解目标分子底物时,表现出比非印迹型更高的催化活性,其光催化降解速率常数可比非印迹型增加约69%;而在降解非目标分子底物时,印迹型催化剂不具选择催化效应,其催化活性与非印迹型相似.
Molecule-imprinted chitosan/TiO2 catalyst was synthesized by using malachite green（MA） as template-molecules from tetra-n-butyl titanate and chitosan.Photo-catalyzed degradation of solution of MA and/or other substrates at UV light in the presence of the MA-imprinted chitosan/TiO2 catalyst was studied and compared with the corresponding non-imprinted systems,and the structure of catalysts was characterized by XRD and FTIR methods.The experimental results indicated that over the MA-imprinted chitosan/TiO2 catalyst,the rate of photo-catalyzed degradation of target-substrate molecules was markedly higher than that of the non-imprinted（popular type） chitosan/TiO2 catalyst（with a 69% increment of k）,and the imprinted catalyst exhibited a selective catalytic activity for the photo-catalyzed degradation of target-substrate molecules.When degrading non-target-substrate molecules,the MA-imprinted chitosan/TiO2 catalyst exhibited a similar activity with the non-imprinted catalyst.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期224-228,共5页
Journal of Xiamen University：Natural Science
基金
福建省自然科学基金项目(2006J0185)
关键词
分子印迹
TIO2
壳聚糖
孔雀石绿
光催化降解
molecular imprint
TiO2
chitosan
malachite green
photo-catalyzed degradation
