Abstract
In this work, a batch adsorption study was conducted to investigate the removal efficiency of lead, copper and zinc ions from aqueous solutions. Magnetic amine-functionalized mesoporous silica nanoparticles were synthesized by grafting amine groups within the channels of magnetic mesoporous silica nanocomposites. Morphological and structural characterizations were made by X-ray powder diffraction, N2 adsorption-desorption, scanning and transmission electron microscopy, Fourier transform infrared spectroscopy and elemental analysis. Among different factors influencing the sorption process, solution pH, shaking time and mass of adsorbent were investigated. The removal efficiencies were higher than 98% under optimized experimental conditions. Maximum adsorption capacities calculated by the Langmuir model were 268, 93 and 82 mg g-1, for lead(II), copper(II) and zinc(II) ions, respectively. Accuracy and applicability of the synthesized adsorbent was estimated by analyzing spiked natural water samples and good recoveries (> 95%) were obtained with no matrix interferences.
Highlights
The removal of toxic metal ion contaminants from aqueous samples is one of the major economic and environmental problems all over the world.[1,2] Toxic metal ions, sometimes even at relatively low concentration, can cause serious hazardous effects on public health, due to their toxicity, carcinogenic effects and tendency to bioaccumulation in living tissues in human bodies
The adsorbent was characterized and the effect of experimental conditions on the removal efficiency of lead(II), copper(II) and zinc(II) ions from aqueous solution was investigated in batch mode and the isotherm equilibrium data were fitted to the Langmuir isotherm
The results showed that shaking time of 5 min was enough for complete removal of metal ions from 20 mL solution with concentration of 25, 7.5 and 1.5 mg L-1 for Pb2+, Cu2+ and Zn2+, respectively
Summary
The removal of toxic metal ion contaminants from aqueous samples is one of the major economic and environmental problems all over the world.[1,2] Toxic metal ions, sometimes even at relatively low concentration, can cause serious hazardous effects on public health, due to their toxicity, carcinogenic effects and tendency to bioaccumulation in living tissues in human bodies. The adsorbent was characterized and the effect of experimental conditions on the removal efficiency of lead(II), copper(II) and zinc(II) ions from aqueous solution was investigated in batch mode and the isotherm equilibrium data were fitted to the Langmuir isotherm.
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