| Summary: | The present work involves the study of Se(IV) adsorption onto rice husk ash (RHA). The adsorbents were coated with the ferric chloride solution for the effective removal of selenium. The physico-chemical characterization of the adsorbents was carried out using standard methods, e.g., proximate analysis, scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), thermo-gravimetric (TGA) and differential thermal analysis (DTA), etc. Batch experiments were carried out to determine the effect of various factors such as adsorbent dose (w), initial pH, contact time (t), and temperature (T) on adsorption process. Se(IV) adsorption is high at low pH values, and decreased with the rise in initial pH. Temperature study shows that the uptake of Se(IV) is more at 293 K within the temperature range studied. The parameters of Pseudo-First order, Pseudo-Second order kinetics, Weber-Morris intra particle kinetics have been determined. Equilibrium isotherms have been analyzed using Langmuir isotherm, Freundlich isotherm and Temkin isotherm. Error analysis has also been done using hybrid fractional error function (HYBRID) and Marquardt’s percent standard deviation (MPSD).
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