Triazole containing magnetic core-silica shell nanoparticles for Pb2+, Cu2+ and Zn2+ removal

Abstract

The main goal of this work was to investigate the ability of 1,2,3-triazole functionalized magnetic nanoparticles (MNP-Trz) and silica coated MNP homologous (MNPS-Trz) for removal of heavy metal cations. Three steps for efficient synthetic pathway were used for chemical modification of magnetic core based on copper catalyzed 1,3-dipolar cycloaddition. The magnetic nanoparticles were characterized by using various techniques such as X-ray diffraction (WAXD), infrared spectroscopy (FTIR), thermogravimetry analysis (TGA), zeta potential analysis, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The adsorption of prepared nanosized magnetic nanoparticles toward Cu2+, Pb2+ and Zn2+ ions was examined as a function of various physical-chemistry conditions. Adsorption isotherms and kinetics were studied and discussed by considering various theoretical models. The equilibrium kinetics was found to be second order model irrespective of investigated system. The best corroborating model with the obtained experimental results was found to be Langmuir one with maximum adsorption capacities at pH 5.5 and 25°C for Cu2+, Pb2+ and Zn2+ ions found to be 87.87, 167.78 and 51.20mgg−1, respectively. Similar high maximum uptake tendency was also obtained for magnetic core-silica shell nanoparticles. It is interesting to notice that the regeneration of the used MNP-Trz was successfully achieved by using 0.1M HNO3 since 88% desorption efficiency was reached.