Sorption of lanthanide ions on biochar composites
来源期刊：JOURNAL OF RARE EARTHS2018年第11期
论文作者：Dorota Koodyńska Justyna Bak Malwina Majdańska Dominika Fila
文章页码：1212 - 1220
摘 要：Sorption of lanthanum(Ⅲ), cerium(Ⅲ) and neodymium(Ⅲ) ions from the aqueous solutions of mixtures through adsorption on the biochar composites was investigated as a function of sorbent mass, pH, phase contact time and initial concentration of solutions at 295 K. The maximum removal of lanthanide ions takes place under the following conditions: 0.1 g of sorbent mass, pH 4 and 360 min contact time for all studied initial concentrations of solutions. Kinetics of La(Ⅲ), Ce(Ⅲ) and Nd(Ⅲ) ions sorption proceeded by a fast initial uptake reached equilibrium. This process was modelled by means of the pseudo first order, pseudo second order, intraparticle diffusion and Elovich models. The desorption of three lanthanide ions by nitric, hydrochloric and sulfuric acids at a concentration of 1 mol/L from biochar composites was also studied. In order to investigate the sorption mechanism FTIR, XRD and XPS analyses were performed after sorption of ions from the mixture.
Dorota Koodyńska，Justyna Bak，Malwina Majdańska，Dominika Fila
Department of Inorganic Chemistry,Faculty of Chemistry,Maria Curie-Sklodowska University
摘 要：Sorption of lanthanum(Ⅲ), cerium(Ⅲ) and neodymium(Ⅲ) ions from the aqueous solutions of mixtures through adsorption on the biochar composites was investigated as a function of sorbent mass, pH, phase contact time and initial concentration of solutions at 295 K. The maximum removal of lanthanide ions takes place under the following conditions: 0.1 g of sorbent mass, pH 4 and 360 min contact time for all studied initial concentrations of solutions. Kinetics of La(Ⅲ), Ce(Ⅲ) and Nd(Ⅲ) ions sorption proceeded by a fast initial uptake reached equilibrium. This process was modelled by means of the pseudo first order, pseudo second order, intraparticle diffusion and Elovich models. The desorption of three lanthanide ions by nitric, hydrochloric and sulfuric acids at a concentration of 1 mol/L from biochar composites was also studied. In order to investigate the sorption mechanism FTIR, XRD and XPS analyses were performed after sorption of ions from the mixture.
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