Abstract
Chitosan-alginate nanosorbents were prepared by cross-linking of chitosan and alginate with tripolyphosphate and calcium chloride, respectively following the water-in-oil (w/o) microemulsion cross-linking technique. The prepared nanosorbents were characterized by FTIR spectral analysis that provided spectral evidences for interactions between the chitosan and alginate biopolymers, and binding of arsenic ions with the nanosorbent. The transmission electron microscopy (TEM) revealed that the size of nanosorbent fell into the range of 20–110 nm whereas the scanning electron microscopy (SEM) indicated almost spherical morphology of the nanosorbents. The size of the nanosorbents was determined by dynamic light scattering measurements which also confirmed the nanosize of the sorbent particles. The nanosorbents were employed for removal of arsenic ions from aqueous solutions and the effect of various experimental conditions such as varying metal ion concentration, pH and temperature of the metal ion solutions, doses of the nanosorbent, and chemical composition of the nanosorbents were studied on the percent removal of arsenic ions. The adsorption data was applied to Langmuir and Freundlich adsorption isotherm models, and the kinetics of the adsorption process was also studied. A plausible mechanism of adsorption of arsenic ions was also proposed.
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