In this study, the adsorption and desorption properties of Pb(II) on D113 resin have been investigated. The different variables affecting the adsorption capacity have been also studied, such as pH of the solution, contact time, Pb(II) concentrations, resin amounts and temperatures, which indicate that D113 resin could be used effectively for the removal of Pb(II) ions from aqueous solution. The results show that the optimal pH for the adsorption of Pb(II) is 5.73 and the maximum saturated adsorption capacity is 598.3 mg/g at 298K. The apparent activation energy Ea and adsorption rate constant k298K values are 16.5 kJ/mol and 1.89×10−5 s−1, respectively. The adsorption of Pb(II) follows the Langmuir isotherm and Freundlich isotherm, and the correlation coefficients have been evaluated. Thermodynamic parameters which ΔS value of 0.241 kJ/(mol K) and ΔH value of 55.18 kJ/mol indicate the endothermic nature of the adsorption process, and a decrease of Gibb's free energy (ΔG) with increasing temperature indicates the spontaneous nature of the adsorption process. The resin can be regenerated through desorption of the Pb(II) using 0.5 mol/L HCl solution and can be reused to adsorb again.
Jianjun Mo, Qian Jia, Chunhua Xiong and Caiping Yao
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