zif-8/ agnps nanocomposites incorporating of electrospum nanofiber membrane for removal of heavy metal ions (cd+2, cu+2) from water and investigation of it’s antibacterial properties

Metal-organic frameworks (mofs) have been widely applied for pollutants removal in water. ag nps also can be considered as suitable antibacterial agent. however, aggregation of mofs and agnps in solution and difficult collection after use are considered as two of the critical challenges for the wide applications of these nanomaterials. effective and efficient removal of both heavy metal pollutants and bacterial contamination from water is an open issue. in this work, silver nanoparticles (agnps) were encapsulated in porous metal-organic frameworks of zif-8 (zif-8/agpss), then electrospun nanofiber composite membranes containing zif-8/agnps incorporated on polyacrylonitrile (pan) nanofiber synthesized via electrospinning have been prepared. the obtained composite membranes were characterized by transmission electron microscopy (tem), scanning electron microscopy (sem), fourier-transform infrared spectroscopy (ft-ir), x-ray diffraction (xrd), brunauer emmett teller (bet). the effects of different parameters influencing the removal efficiency including the concentration of sample and its volume, the amount of the sorbent, ph, the ionic strength, the time of extraction and the reusability of the sorbent were investigated and optimized. under the optimized conditions, the linearity varied in range of 0.25–30 mg l−1 for cu+2 and 0.1-20 mg l−1 with r2 values higher than 0.998. the adsorption kinetic fitted well with pseudo-second-order model and it’s adsorption isotherm can be described by langmuir model. the effectiveness of pan-zif-8/agnps nanofibrous membrane was optimized in a batch system for the removal of cd+2 and cu+2 ions, and additionally characterized for it’s antimicrobial properties. the fiber nanocomposite exhibited efficient antibacterial activity, with maximum adsorption capacity of about 49.3 mg g-1 for cd+2 and of about 51.6 mg g-1 for cu+2 after 120 min. the applicability of the method was examined by analyzing the analytes in the water and wastewater samples. the prepared membrane appears to be promising for possible use in water purification systems.