College of Civil Engineering and Architecture, Zhejiang University, and Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2018 Mar;25(7):6729-6738. doi: 10.1007/s11356-017-0949-3. Epub 2017 Dec 19.
The molecular imprinting technique combined with photocatalysis was used in the removal of fluoroquinolones. In this study, we prepared molecular imprinted polymers (MIPs) and investigated the adsorption and photocatalytic regeneration performance, followed by the effect of different environmental factors and photoproduct identification. Compared with non-imprinted polymers (NIPs) and P25, MIPs had a better adsorption performance towards norfloxacin with the removal efficiency of 77.1% in 1 h. pH, humic acid, and high valence ions had significant effects on the adsorption performance. Under neutral condition, the adsorption effect of MIPs was better than that of acidic and alkaline condition. The removal efficiency declined to 25.9% when pH reached 11. The removal efficiency gradually improved with the concentration of humic acid increasing. The adsorption efficiency of MIPs in surface water was only 12.6% lower than that of ultrapure water, which indicated that molecular imprinting process improved the anti-interference property. The photodegradation rate was 0.114 min when the concentration of norfloxacin was 1 mg L. Norfloxacin was oxidized with aldehyde group or hydroxyl. The adsorption removal efficiency of MIPs did not decline apparently after 11 adsorption-photocatalytic regeneration cycles, which suggested that the in-situ regeneration and sustainable use of MIPs were achievable in organic pollutant control.
分子印迹技术与光催化相结合被用于去除氟喹诺酮类抗生素。本研究制备了分子印迹聚合物（MIPs），并考察了其吸附和光催化再生性能，以及不同环境因素的影响和光产物的鉴定。与非印迹聚合物（NIPs）和 P25 相比，MIPs 对诺氟沙星的吸附性能更好，在 1 h 内的去除效率达到 77.1%。pH 值、腐殖酸和高价离子对吸附性能有显著影响。在中性条件下，MIPs 的吸附效果优于酸性和碱性条件。当 pH 值达到 11 时，去除效率下降至 25.9%。随着腐殖酸浓度的增加，去除效率逐渐提高。MIPs 在地表水中的吸附效率仅比超纯水中低 12.6%，表明分子印迹过程提高了抗干扰能力。当诺氟沙星浓度为 1 mg·L 时，光降解速率为 0.114 min。诺氟沙星被氧化为醛基或羟基。在 11 次吸附-光催化再生循环后，MIPs 的吸附去除效率没有明显下降，这表明在有机污染物控制中可以实现 MIPs 的原位再生和可持续使用。
