期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 181, 期 1-3, 页码 836-844出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.05.089
关键词
Heavy-metal ions removal; Isotherms; Alumina nanoparticles; Modified nanoparticles; Wastewater
资金
- Bu-Ali Sina University Research Council
- Center of Excellence in Development of Chemical Methods (CEDCM)
2,4-Dinitrophenylhydrazine (DNPH) immobilized on sodium dodecyl sulfate coated nano-alumina was developed for the removal of metal cations Pb(II), Cd(II), Cr(III), Co(II), Ni(II) and Mn(II) from water samples. The research results displayed that adsorbent has the highest adsorption capacity for Pb(II), Cr(III) and Cd(II) in ions mixture system. Optimal experimental conditions including pH, adsorbent dosage and contact time have been established. Langmuir and Freundlich isotherm models were applied to analyze the experimental data. The best interpretation for the experimental data was given by the Freundlich adsorption isotherm equation for Mn(II), Pb(II), Cr(III) and Cd(II) ions and by Langmuir isotherm equation for Ni(II) and Co(II) ions. Desorption experiments by elution of the adsorbent with a mixture of nitric acid and methanol show that the modified alumina nanoparticles could be reused without significant losses of its initial properties even after three adsorption-desorption cycles. Thus, modified nano-alumina with DNPH is favorable and useful for the removal of these metal ions, and the high adsorption capacity makes it a good promising candidate material for Pb(II),Cr(III) and Cd(II) removal. (C) 2010 Elsevier B.V. All rights reserved.
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