分子印迹TiO_2的制备及其对抗生素磺胺甲氧嘧啶的光催化降解  

Preparation of Molecularly Imprinted Titania and Its Photocatalytic Capacity for Sulfamonomethoxine

作　　者：王云[1] 陈芳艳[1] 丁旻炜 高承娟[1] 李启祥[1] 顾昊晨 

机构地区：[1]江苏科技大学环境与化学工程学院,江苏镇江212008

出　　处：《环境科技》2016年第4期6-10,共5页Environmental Science and Technology

基　　金：江苏省高等学校大学生创新创业训练计划项目(201510289026Z);江苏科技大学本科生创新计划项目

摘　　要：以磺胺甲氧嘧啶(SMD)为模板分子、甲基丙烯酸为功能单体,采用表面分子印迹技术在TiO_2表面合成SMD-分子印迹聚合物,制备分子印迹TiO_2(MIP-TiO_2)。考察了模板分子、功能单体、交联剂的摩尔比以及TiO_2的用量对分子印迹TiO_2光催化性能的影响,确定了最佳制备条件。采用傅里叶变换红外光谱、扫描电镜对分子印迹性TiO_2进行了表征,研究分子印迹TiO_2对磺胺甲氧嘧啶的光催化性能。结果表明,分子印迹性TiO_2的最佳制备条件为:模板分子、功能单体、交联剂的摩尔比为1︰4︰8,TiO_2的质量为0.05 g。分子印迹TiO_2对SMD的光催化效果明显高于TiO_2,光催化降解SMD的最适pH值为5,催化剂用量为0.4 g/L,光照时间为100 min。在此条件下,初始质量浓度为5 mg/L的SMD降解效率达100%,与TiO_2相比,提高了20%。Molecularly imprinted titania（MIP-TiO2） was prepared by using sulfamethoxydiazine（SMD）as template, methacrylic acid （MAA） as functional monomer to synthesize molecularly imprinted polymer on the surface of titania. The influence of TiO2 dosage and molar ratio of template molecule, functional monomer and crosslinking agent on photocatalytic properties of MIP-TiO2 were investigated. The optimal preparation conditions were determined. MIP-TiO2 was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that the optimal conditions of preparation of MIP-TiO2 were as follows：molar ratio of template molecules-to-monomer-to-crosslinking agent of 1︰4︰8 and TiO2 dosage of 0.05 g. The photocatalytic capacity of MIP-TiO2 for decomposition of SMD was significantly higher than that of TiO2. The optimum conditions for degradation of SMD were as follows： pH of 5, MIP-TiO2 dosage of 0.4 g/L, exposure time of 100 min. The decoposition rate of SMD with initial concentration of 5 mg/L reached 100%, which increased by 20%, compared with TiO2.

关 键 词：分子印迹 磺胺甲氧嘧啶 二氧化钛 光催化 催化剂 

分 类 号：X5[环境科学与工程—环境工程]