Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/62791
Type: Artigo de periódico
Title: CHARACTERIZATION AND USE OF IN NATURA AND CALCINED RICE HUSKS FOR BIOSORPTION OF HEAVY METALS IONS FROM AQUEOUS EFFLUENTS
Author: Vieira, MGA
Neto, AFD
da Silva, MGC
Nobrega, CC
Melo, AA
Abstract: Heavy metal removal by adsorption using rice husks as a bioadsorbent was evaluated as an alternative for wastewater treatment. Batch equilibrium experiments and kinetic sorption studies were performed using monocoinponent solutions of Ni(II), Cd(II), Zn(II), Pb(II) and Cu(I I) in surface samples of in natura (RH) and calcined rice husks (RHA). RHA showed higher potential for removing lead and copper. Experimental data for adsorption isotherms of lead and copper were adjusted by Langmuir, Freundlich and Dubinin-Radushkevick (D-R) models, being better represented by the Langmuir model. The calcination of RI-I increased its surface area, improving its adsorption properties. From a morphological analysis obtained by SEM and diffraction patterns (XRD), a longitudinal fibrous and amorphous structure was observed for RI-I. TGA results indicated a total mass loss of around 60% for RH and 24.5% for RNA.
Subject: Rice husks
Heavy metals
Biosorption
Country: Brasil
Editor: Brazilian Soc Chemical Eng
Rights: aberto
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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