Characterization and use of in natura and calcined rice husks for biosorption of heavy metals ions from aqueous effluents

Brazilian Journal of Chemical Engineering

M. G. A. Vieira²  A. F. De Almeida Neto¹  M. G. Carlos Da Silva¹  C. C. Nóbrega¹  A. A. Melo Filho¹ 

[1] ,State University of Campinas School of Chemical Engineering Department of Processes and Products DesignCampinas SP ,Brazil

关键词: Rice husks;    Heavy metals;    Biosorption;   

DOI  :  10.1590/S0104-66322012000300019

来源: SciELO

【 摘 要 】

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 monocomponent solutions of Ni(II), Cd(II), Zn(II), Pb(II) and Cu(II) 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 RH 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 RH. TGA resultsindicated a total mass loss of around 60% for RH and 24.5% for RHA.

【 授权许可】

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