Ag-MMOFs复合材料的制备及其对硝基苯酚的降解作用

Preparation of Ag-MMOFs composite and its degradation properties on nitrophenol

采用双溶剂法制备Ag-ZIF-8(Zn-Co)多金属MOFs材料,并将其用于对硝基苯酚、邻硝基苯酚和对硝基苯胺等污染物的催化还原;利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电镜(TEM)对制备的材料进行表征。结果表明:Ag-ZIF-8(Zn-Co)在催化降解3种污染物方面表现出优异的催化活性;Ag-ZIF-8(Zn-Co)催化降解对硝基苯酚反应的表观速率常数和转换频率分别为1.080×10^(-4)s^(-1)和2.056 min^(-1),并在多次重复使用过程中保持较高的催化性能;与单金属复合材料Ag-ZIF-8和Ag-ZIF-67相比,Ag-ZIF-8(Zn-Co)的催化活性显着提高,主要原因是Ag-ZIF-8(Zn-Co)具有高比表面积,Zn和Co双金属的协同作用,以及孔道对银纳米颗粒的限制等。

Ag-ZIF-8(Zn-CO)multi metal MOFs was prepared by double-solvent method and applied to the catalytic reduction pollutants of p-nitrophenol,o-nitrophenol and p-nitroaniline.The obtained samples were fully characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD)and transmission electron microscope(TEM).The results show that Ag-ZIF-8(Zn-Co)shows excellent catalytic activity in the catalytic degradation of three pollutants.The apparent rate constant and conversion frequency of Ag-ZIF-8(Zn-Co)catalytic degradation of p-nitrophenol are 1.080×10^(-3)s^(-1)and 2.056 min^(-1),respectively,and high catalytic performance is maintained during repeated use.Compared with Ag-ZIF-8 and Ag-ZIF-67,the catalytic activity of Ag-ZIF-8(Zn-Co)is significantly improved,which is mainly due to the high specific surface area of Ag-ZIF-8(Zn-Co),Zn and Co bimetallic synergy,and encapsulation of silver nanoparticles by pores.