Highly efficient removal of arsenic using amine-modified silica incorporating in PLA adsorptive membrane
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The environmental applications of pristine silica (SiO 2 ) nanoparticles (NPs) for arsenic removal have been limited by their severe aggregation and lack of functional groups. Amine-modified SiO 2 (NH 2 ) NPs were incorporated in PLA for the removal of 100 ppb of arsenic; a concentration much higher than what has been reported for surface water in Iran. FTIR analysis has demonstrated that the amine modified SiO 2 NPs have been successfully prepared. Addition of SiO 2 and SiO 2 (NH 2 ) increased the porosity, water uptake, mechanical strength, hydrophilicity and permeability of the membrane up to 1.0 and 1.5 wt.%, respectively. The batch adsorption experiments were conducted to assess the equilibrium adsorption capacity and kinetics of adsorptive membranes. The Langmuir and Freundlich models demonstrated good correlation for membranes containing SiO 2 and SiO 2 (NH 2 ) NPs, respectively. Both kinds of the membranes demonstrated behavior consistent with the pseudo-second-order kinetic model, which can be linked to rapid electrostatic adsorption. Dynamic adsorption of the PLA- SiO 2 (NH 2 )-1.0 membrane was assessed through three adsorption-desorption cycles. The results confirmed the favorable properties of the SiO 2 (NH 2 ), effectively reducing As (V) concentration in contaminated water (100 ppb) to levels below the maximum concentration level (MCL).
