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• W2011054101 abstract "Abstract The potentiality of lignin, obtained as a byproduct of kraft mill industry, for adsorptive preconcentration and separation of Au(III) from acidic chloride media was investigated. Quantitative adsorption of Au(III) from hydrochloric acid medium was achieved using crude lignin while no base metals were adsorbed on it. Adsorption of Au(III) on lignin followed typical Langmuir monolayer adsorption and the maximum Au(III) uptake capacity of the material was found to be approximately 6.0 mol kg −1 at 313 K. Increasing temperature appeared to improve the amount of gold adsorbed in addition to enhancing the sorption kinetics. The computed thermodynamic parameters demonstrated that the adsorption was a spontaneous process and was favorably governed by an endothermic reaction. A pseudo-first-order kinetic model explained the results of kinetic studies conducted at various temperatures and also allowed the estimation of activation energy of the adsorption reaction. The obtained value of activation energy indicated that the sorption of Au(III) on lignin was a chemisorption process. The adsorbed Au(III) species was subsequently reduced to metallic gold by the reducing functional groups present in the lignin matrix. Because of its considerable gold uptake capacity and resultant formation of elemental gold aggregates, kraft mill lignin is a promising candidate for gold recovery from acidic chloride media." @default.
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• W2011054101 date "2013-09-01" @default.
• W2011054101 modified "2023-09-23" @default.
• W2011054101 title "Kraft mill lignin – A potential source of bio-adsorbents for gold recovery from acidic chloride solution" @default.
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• W2011054101 doi "https://doi.org/10.1016/j.cej.2013.07.016" @default.
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