Adsorption of erbium(Ⅲ) on D113-Ⅲ resin from aqueous solutions:batch and column studies
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：YAO Caiping XIONG Chunhua MENG Yuan SHEN Chen
Key words：D113-Ⅲ resin; erbium(Ⅲ); kinetics; thermodynamic; equilibrium; rare earths;
Abstract: The adsorption and desorption behaviors of Er(Ⅲ) ion on D113-Ⅲ resin were investigated. Batch adsorption studies were carried out with various Er(Ⅲ) ion concentrations, pH, contact time and temperature, indicating that D113-Ⅲ resin could adsorb Er(Ⅲ) ion effec-tively from aqueous solution. The loading of Er(Ⅲ) ion onto D113-Ⅲ resin increased with increasing the initial concentration. The adsorp-tion was strongly dependent on pH of the medium with enhanced adsorption as the pH turned from 3.45 to 6.75. In the batch system, the D113-Ⅲ resin exhibited the highest Er(Ⅲ) ion uptake as 250 mg/g at 298 K, at an initial pH value of 6.04, calculated from the Langmuir isotherm model. The adsorption kinetics was in agreement with Lagergren-first-order kinetics among the Lagergren-first-order model,pseudo-second-order model, liquid filim diffusion model and intraparticle diffusion model. The adsorption data gave good fits with Langmuir isotherms. The thermodynamic parameters such as △G, which were all negative, indicated that the adsorption of Er(Ⅲ) ion onto D113-Ⅲ resin was spontaneous and the positive value of △H showed that the adsorption was endothermic in nature. Thomas model was applied to experimental column data to determine the characteristic parameters of column useful for process design. Er(Ⅲ) ion could be eluted by using the 4.0 mol/L HCl solution. The characterization of both before and after adsorption of Er(Ⅲ) ion on D113-Ⅲ resin was undertaken with IR spectroscopic technique. Moreover, the surface characterization of D113-Ⅲ resin was described by scanning electron micrographs (SEM).
YAO Caiping1，XIONG Chunhua1，MENG Yuan1，SHEN Chen1
(1.Department of Applied Chemistry,Zhejiang Gongshang University,Hangzhou 310035,China)
Abstract:The adsorption and desorption behaviors of Er(Ⅲ) ion on D113-Ⅲ resin were investigated. Batch adsorption studies were carried out with various Er(Ⅲ) ion concentrations, pH, contact time and temperature, indicating that D113-Ⅲ resin could adsorb Er(Ⅲ) ion effec-tively from aqueous solution. The loading of Er(Ⅲ) ion onto D113-Ⅲ resin increased with increasing the initial concentration. The adsorp-tion was strongly dependent on pH of the medium with enhanced adsorption as the pH turned from 3.45 to 6.75. In the batch system, the D113-Ⅲ resin exhibited the highest Er(Ⅲ) ion uptake as 250 mg/g at 298 K, at an initial pH value of 6.04, calculated from the Langmuir isotherm model. The adsorption kinetics was in agreement with Lagergren-first-order kinetics among the Lagergren-first-order model,pseudo-second-order model, liquid filim diffusion model and intraparticle diffusion model. The adsorption data gave good fits with Langmuir isotherms. The thermodynamic parameters such as △G, which were all negative, indicated that the adsorption of Er(Ⅲ) ion onto D113-Ⅲ resin was spontaneous and the positive value of △H showed that the adsorption was endothermic in nature. Thomas model was applied to experimental column data to determine the characteristic parameters of column useful for process design. Er(Ⅲ) ion could be eluted by using the 4.0 mol/L HCl solution. The characterization of both before and after adsorption of Er(Ⅲ) ion on D113-Ⅲ resin was undertaken with IR spectroscopic technique. Moreover, the surface characterization of D113-Ⅲ resin was described by scanning electron micrographs (SEM).
Key words:D113-Ⅲ resin; erbium(Ⅲ); kinetics; thermodynamic; equilibrium; rare earths;
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