Kinetics and thermodynamics of Cu(II) adsorption on oil shale wastes |
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Authors: | PM Pimentel MAF Melo DMA Melo ALC Assunção DM Henrique CN Silva Jr G González |
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Affiliation: | 1. Universidade Federal do Rio Grande do Norte, Departamento de Química, CP 1662, 59078-970, Natal/RN, Brazil;2. Centro de Pesquisas da PETROBRAS (CENPES). Ilha do Fundão, Q.7, 21949-900, Rio de Janeiro, RJ, Brazil |
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Abstract: | The oil shale waste material, retorted shale, was utilized as an adsorbent for Cu(II) removal from aqueous solution. The kinetics and thermodynamic adsorption was investigated during a series of batch adsorption experiments. The removal efficiency was controlled by solution pH, temperature, initial ion concentration and contact time. Two simple kinetic models, pseudo-first-and second-order, were used to investigate the adsorption mechanisms. The pseudo-second-order chemical reaction kinetics provides the best correlation with the experimental data. Langmuir and Freundlich models were used to fit the equilibrium data, which showed that Langmuir best-fitted these data. Thermodynamic parameters such as free energy, enthalpy and entropy were calculated to predict the nature of the adsorption process. |
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Keywords: | Cooper (II) Retorted shale Adsorption isotherms |
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