Porous nanocomposite based on metal-organic framework: Antibacterial activity and efficient removal of Ni(II) heavy metal ion

Abstract

In present work, a novel ZIF-8@SnO2@CoFe2O4 nanostructure was fabricated by hydrothermal rote and its ability was assessed for sorption of Ni2+ and disinfection of microorganisms. FTIR, XRD, DLS, SEM, TEM, BET and VSM analyses were utilized to confirm the characterization of the synthesized MOF. Performance of ZIF-8@SnO2@CoFe2O4 for Ni(II) adsorption was investigated as a function of pH, dose, time, various Ni2+ concentrations and temperatures. The results exhibit that ZIF-8@SnO2@CoFe2O4 has a good performance for Ni2+ adsorption from an aqueous medium so that 60 min mixing of 40 mg of adsorbent with the 50 mg L−1 of pollutant at a pH = 6. Equilibrium tests detected that Sips isotherm had the best agreement to the experiment data with R2 of 0.9957. The maximum adsorption capacity was also obtained 21.43 mg g−1. The sorption kinetics followed the pseudo first order model. Thermodynamic study illustrated an endothermic and physisorption reaction for nickel sorption onto ZIF-8@SnO2@CoFe2O4. Results achieved from disc diffusion, MBC and MIC methods exhibited that ZIF-8@SnO2@CoFe2O4 led to excellent biocidal activities for selected strains of bacteria. Additionally, the highest radius of inhibition zone was measured for ZIF-8@SnO2@CoFe2O4 against Escherichia coli by disc diffusion test as 18 mm.