原位生长的双金属CoZn-ZIF/PAN纳米复合纤维膜催化降解诺氟沙星

In situ growth of bimetallic CoZn-ZIF/PAN nanocomposite fiber membranes catalyzes the degradation of norfloxacin

针对高级氧化技术中催化材料活性位点单一,pH值使用范围窄,难以回收利用的难题,采用静电纺丝结合原位生长法制备了双金属CoZn-ZIF/PAN纳米复合纤维膜,用于催化过一硫酸盐降解诺氟沙星(NOR).光谱结合能谱分析结果显示CoZn-ZIF纳米颗粒被成功地固定在电纺PAN纳米纤维上.与空白纳米纤维相比,双金属CoZn-ZIF颗粒使得CoZn-ZIF/PAN膜具有更大的比表面积,为催化反应提供了大量的活性位点.随着Co掺杂比例的增大,NOR的降解率增加;在pH 3-9范围内,CoZn-ZIF/PAN复合纳米纤维膜催化PMS对诺氟沙星的降解率达到90%以上,且最佳的pH工作条件为中性范围,更有利于该纳米复合纤维膜的实际应用.循环试验显示3个循环周期后,CoZn-ZIF/PAN对NOR的降解效率仍高于80%,而Co离子的浸出浓度远低于2mg·L^(-1),说明了该纳米复合纤维膜材料具有优异的循环性和稳定性.利用原位生长的方式实现CoZn-ZIF/PAN纳米复合纤维膜的构建是实现类Fenton反应高效运行的可行策略.

Advanced oxidation technology are hindered by the poor catalytic activity of single-site catalysts,acidic circumstance necessary,and difficult recycling of catalytic materials.In this work,bimetallic CoZn-ZIF/PAN nanocomposite fiber membranes were prepared by electrospinning combined with in situ growth strategy to catalyze the norfloxacin(NOR)degradation by permonosulfate.The spectral binding energy spectroscopy results showed that CoZn-ZIF nanoparticles were successfully immobilized on electrospun PAN nanofibers.Compared with blank nanofibers,the CoZn-ZIF/PAN membrane have larger specific surface area,which provide a large number of active sites for catalytic reactions.With the increase of the Co-doping ratio,the degradation rate of NOR increased.In the pH 3—9 range,the degradation rate of NOR catalyzed by CoZn-ZIF/PAN membrane reaches more than 90%,and the optimal pH working conditions are neutral range,which is more conducive to the practical application of the nanocomposite fiber membrane.The cycling test showed that the degradation efficiency of CoZn-ZIF/PAN for NOR was still higher than 80%after three cycles,while the leaching concentration of Co ions was much lower than 2 mg·L^(-1),indicating that the nanocomposite fiber membrane material had excellent cycling and stability.The construction of CoZn-ZIF/PAN nanocomposite fiber membrane with in-situ growth strategy is a feasible tactics to achieve efficient operation of Fenton-like reactions.