Effective adsorption of Co2+ and Sr2+ ions by 10-tungsten-2-molybdophosphoric acid supported amine modified magnetic SBA-15

The presence of heavy metals in water sources have created serious environmental concerns. In this study, 10-tungsten-2-molybdophosphoric acid supported amine-functionalized magnetic SBA-15 with core-shell morphology was prepared and its applicability as effective inorganic adsorbent for Co2+ and Sr2+ removal was investigated. The adsorbent was characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometer, inductively coupled plasma analysis and N-2 physical adsorption-desorption technique. The effective parameters including dosage of adsorbent, contact time, initial concentration of metal ion, pH of solution, temperature and elution agent were investigated. Batch adsorption studies depicted higher adsorption affinity for Co2+ than Sr2+ ions. The synthesized adsorbent has an adsorption capacity of 87.72mgg(-1) and 80.01 for Co2+ and Sr2+ respectively. This research highlights the source of difference between their adsorption capacity. EDTA had more desorption performance as elution agent than HCl that attributed to larger chelating stability constant of EDTA. Moreover, the results showed the good recyclability and excellent stability of adsorbent after 4 successive cycles. [GRAPHICS] .