Photocatalytic degradation of norfloxacin by magnetic molecularly imprinted polymers: influencing factors and mechanisms
Photocatalytic degradation of norfloxacin by magnetic molecularly imprinted polymers: influencing factors and mechanisms
复制标题
磁性分子印迹聚合物光催化降解诺氟沙星：影响因素和机制
DOI：
10.1080/09593330.2021.2003442
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发表时间：
2021-05
影响因子：
2.8
通讯作者：
Zhou Yongchao
中科院分区：
文献类型：
--
作者：
Fang Lei;Tang Kaijie;Wei Dong;Zhang Yan;Zhou Yongchao
摘要：利用光催化降解和磁分离技术制备了新型磁性分子印迹聚合物（MMIP），用于选择性去除诺氟沙星。具有钛层和多孔表面的印迹材料表现出优异的光催化性能。本文研究了mip光催化降解诺氟沙星的动力学，并阐明了环境因素（溶液pH、腐植酸、常见离子和水介质）对mip光催化性能的影响。结果表明，mip具有良好的适应性，在60min内可降解诺氟沙星，但在地表水中的降解速率常数降低。在中间产物鉴定的基础上，分析了诺氟沙星可能的降解途径，推测其可能被降解为去哌嗪环、去羧基和去氟形式的小分子。紫外照射150 min后，诺氟沙星的矿化率可达84.2%，其钴释放量低，增强了材料的安全性。吸附和降解循环试验结果表明，通过分子印迹技术获得的mip对微量有机污染物的去除具有良好的可持续利用性能。图形抽象
ABSTRACT Novel magnetic molecularly imprinted polymers (MMIP) were prepared for selective removal of norfloxacin by effectively utilizing photocatalytic degradation and magnetic separation techniques. The imprinted material with titanium layer and multihole surface showed an excellent photocatalytic property. In this paper, the kinetics of photocatalytic degradation of norfloxacin by MMIP was explored, and the influences of environmental factors, including solution pH, humic acid, common ions and water media on photocatalytic performance of MMIP were elucidated. The results showed that MMIP had good adaptability and could degrade norfloxacin within 60 min, but the degradation rate constant decreased in surface water. Based on the identification of intermediate products, the possible degradation pathways of norfloxacin were analysed, speculating that it might be degraded into small molecules in the form of de-piperazine ring, de-carboxyl group and de-fluorine. Moreover, the mineralization ratio of norfloxacin could reach 84.2% after ultraviolet irradiation for 150 min, and the low cobalt release of MMIP enhanced the security of the material. The results of adsorption and degradation cycle tests showed that MMIP obtained by molecular imprinting technology had excellent performance in sustainable use for micro organic pollutants removal. GRAPHICAL ABSTRACT
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