Silver-Alumina Impregnated Maghemite/Magnetite Nanocomposites for Effective Removal of Chromium(VI) from the Tannery Discharge
Kistan Andiyappan, V Kanchana
Abstract
The chromium(VI) ions present in the tannery waste was efficiently remove by using silver-alumina impregnated maghemite/magnetite nanocomposites as adsorbents. The as-synthesized adsorbents were characterized by XRD, SEM-EDAX, HR-TEM and FT-IR techniques. The adsorption process was found to be pH, time, dosage of adsorbent and temperature dependent. The adsorption data appropriate well with the pseudo-first-order kinetics, pseudo-second-order kinetics Langmuir and Freundlich isotherms. Among the two synthesized nanoabsorbents, the silver-alumina impregnated magnetite (SAMG) nanocomposite was found to be most effective absorbent, and its maximum chromium removal efficiency was achieved to be 98.81% within 2 h at a pH of 3.0 and at dosage of 0.5 g/L.