分子印迹壳聚糖/TiO2光助催化剂选择性降解孔雀石绿

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.

Selective Degradation of Malachite Green Catalyzed by Moleculeimprinted Chitosan/TiO2 Photo-assisted Catalyst

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.