掺杂银纳米粒子的钴基金属-有机框架纳米复合材料对土霉素的光催化降解

Co-based metal-organic framework nanocomposites doped with Ag nanoparticles for photocatalytic degradation of oxytetracycline

目的:采用超声还原法制备银纳米颗粒-羽片外壳ZIF-67纳米复合材料(Ag-ZIF-67p),测定土霉素(OTC)降解效果,探究其光催化性能。方法:采用超声法制备具有较大比表面积的羽片外壳的ZIF-67p,通过还原金属前驱体AgNO_(3),将纳米尺度Ag粒子负载到ZIF-67外壳羽片上得到Ag-ZIF-67p复合材料。通过SEM、TEM、XRD、XPS等对材料进行表征,光度法探究不同条件下复合材料对OTC的降解效果。结果:由于ZIF-67大孔隙率和表面积的协同特性以及Ag纳米颗粒的高导电性和优异的催化活性,对土霉素降解具有协同催化作用。结论:Ag-ZIF-67p可作为高效降解土霉素的催化材料。

Objective:Silver nanoparticle-ZIF-67 nanocomposite(Ag-ZIF-67p)was prepared by ultrasonic reduction method.The degradation effect of oxytetracycline(OTC)was measured to investigate its photocatalytic performance.Methods:ZIF-67p(ZIF-67 nanopinnas)with large specific surface area was prepared by ultrasonic method,and Ag-ZIF-67p composite was obtained by reducing the metal precursor AgNO_(3) and loading nano-scale Ag particles onto ZIF-67 shell pinna.The materials were characterized by SEM,TEM,XRD,XPS,etc.,and the degradation effect of composites on OTC under different conditions was investigated by photometry.Results:Due to the synergistic properties of large porosity and surface area,as well as the high conductivity and excellent catalytic activity of Ag nanoparticles,ZIF-67 had a synergistic catalytic effect on oxytetracycline degradation.Conclusion:Ag-ZIF-67p could be used as catalytic material for degradation of oxytetracycline.