一种可温度与pH调控的分子印迹光催化材料的制备及其性能

doi:10.16085/j.issn.1000-6613.2020-0464

摘要/Abstract

摘要：

以氧氟沙星为模板分子，通过表面引发原子转移自由基聚合技术（SI-ATRP），成功合成了一种智能凝胶接枝纳米TiO₂的分子印迹光催化材料（TiO₂-DR/MIPs）。采用透射电镜（TEM）、红外光谱（FTIR）、热重（TG）和X射线衍射（XRD）等方法对该材料进行了形貌及性质表征。分别研究了材料的温度与pH敏感性质及其对氧氟沙星光催化降解效率的影响，并对该材料的选择性和稳定性进行了探究。结果表明，TiO₂-DR/MIPs的粒径可随着温度与pH的变化呈现出良好的响应特性，并且可以通过改变环境温度和pH实现对其光催化活性的调控。TiO₂-DR/MIPs对氧氟沙星具有较好的选择性吸附和降解作用，且稳定性和重复使用效果好，经4次光催化降解循环实验后，光催化效率仅降低了5％。此外，TiO₂-DR/MIPs中的双敏感分子印迹层还可以有效地阻止纳米TiO₂的团聚，实现纳米TiO₂的均匀分散。

关键词: 二氧化钛, 聚N-异丙基丙烯酰胺, 分子印迹, 光催化, 氧氟沙星

Abstract:

A molecular imprinted photocatalytic material with intelligent hydrogel grafted TiO₂ (TiO₂-DR/MIPs) was prepared by surface initiated atom transfer radical polymerization (SI-ATRP) with ofloxacin as template molecule. The morphology and properties of the material were characterized by TEM, FTIR, TG and XRD. The temperature and pH sensitive properties of the materials and their effects on the photocatalytic degradation efficiency of ofloxacin were investigated. Meanwhile, the selectivity and stability of the molecular imprinted materials were also explored. The results showed that the TiO₂-DR/MIPs particle size had good response characteristics with the change of temperature and pH, and its photocatalytic activity could be regulated by changing the ambient temperature and pH. TiO₂-DR/MIPs not only had good selective adsorption and degradation of ofloxacin, but also had good stability and reusability. After four cycles of photocatalytic degradation experiments, the photocatalytic efficiency was only reduced by 5%. In addition, the double-responsive molecular imprinted layer in TiO₂-DR/MIPs could effectively prevent the agglomeration of TiO₂ and achieve uniform dispersion of TiO₂.

Key words: titanium dioxide (TiO₂), poly(N-isopropylacrylamide) (PNIPAM), molecular imprinted, photocatalysis, ofloxacin

中图分类号:

O647

蒋彩云, 吴婷, 周海飞, 王玉萍. 一种可温度与pH调控的分子印迹光催化材料的制备及其性能[J]. 化工进展, 2021, 40(1): 305-312.

Caiyun JIANG, Ting WU, Haifei ZHOU, Yuping WANG. Preparation and property of a molecular imprinted material with photocatalytic activity controlled by temperature and pH[J]. Chemical Industry and Engineering Progress, 2021, 40(1): 305-312.

图/表 9

图1 TiO2和TiO2-DR/MIPs的XRD谱图

图2 TiO2、TiO2-NH2、TiO2-Br和TiO2-DR/MIPs的FTIR谱图

图3 TiO2和TiO2-DR/MIPs的TEM表征

图4 TiO2和TiO2-DR/MIPs粒径分布图

图5 TiO2、TiO2-DR/MIPs和TiO2-DR/NIPs的TG曲线图

图6 温度和pH对粒径的影响及zeta电位图

图7 温度和pH对OFL降解率的影响

图8 TiO2-DR/MIPs和TiO2-DR/NIPs对抗生素光催化选择性的影响

图9 温度和pH对光催化稳定性的影响

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