Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 317, Issue 1-3, Pages 512-521Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2007.11.031
Keywords
orange peel cellulose; cadmium; zinc; cobalt; nickel
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The preparation of chemically modified orange peel cellulose adsorbents and its biosorption behaviors of Co(II), Ni(II), Zn(II) and Cd(II) have been studied. Effects of different chemical modifications on the adsorbent properties including different alkalis saponification (NaOH, NH4OH, and Ca(OH)(2)) and different acids (C6H6O7 center dot H2O, H2C2O4, and H3PO4) modification after saponification with NaOH were investigated. The FT-IR spectra showed that there are different functional groups in adsorbents, which are able to react with metal ions in aqueous solution. The maximum adsorption capacities of Ni(11), Co(11), Zn(11) and Cd(II) for SPA, SPA, SCA and SOA were obtained as 1.28, 1.23, 1.21 and 1.13 mol/kg and have increased by 95, 178, 60 and 130% compared to raw orange peel, respectively. Effects of initial pH, initial metal ions concentrations, shaking time and solid/liquid ratio on metal ions biosorption were also investigated. Biosorption equilibriums were rapidly established in about 60 min and the adsorption kinetics followed the Lagergren first-order kinetics model. The Langmuir and Freundlich adsorption isotherms models fitted the experimental data best with regression coefficient R-2 > 0.95 for all the metal ions. Elution efficiencies with different concentrations of HCl were evaluated. (C) 2007 Elsevier B.V. All rights reserved.
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