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Kinetic Study of Arsenite Adsorption onto Dried Hyacinth Root Powder

Author Affiliations

  • 1Department of Civil and Environmental Engineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, INDIA

Res.J.chem.sci., Volume 5, Issue (1), Pages 41-48, January,18 (2015)

Abstract

The potential use of dried hyacinth root (DHR) as biosorbent for mitigating arsenic from aqueous solution is studiedcombining kinetic model and elovich model, using scanning electron microscope coupled with energy dispersive X-ray(SEM-EDX). This analysis suggested the suitability of pseudo-second order type II and type IV kinetic model followed byelovich model for describing the adsorption process of Arsenic-DHR system. The validity of model was further justifiedbased on normalized standard deviation percentage. Also, the applicability of the kinetics models was analyzed with thecloseness of the experimental and modeled values of equilibrium adsorption capacity (qe).The SEM images of dried hyacinthroots before and after exposure indicates the adsorption of arsenic onto DHR. EDX spectrum analysis initially did not showany characteristic signal of arsenic but after exposing to an initial concentration of 2 ppm arsenic gives the characteristicpeak for arsenic at 1.12, 1.15, 1.28, 10.54, and 11.72 KeV. This confirms the binding of the arsenite ion onto dried hyacinthroot. This research concludes that chemisorptions is the rate-limiting step on the basis of highest coefficient ofdetermination, R2, and also on the lowest normalized standard deviation percentage, ? qt(%). @Yes

References