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Published on: May 11, 2017
Adsorption of lithium ions from aqueous solution by magnetic aluminum-based adsorbents
Yaru Qin1, Tingfei Yang1, Chenglong Shi1,2
1School of Chemistry and Chemical Engineering, Qinghai Minzu University, Xining, Qinghai, China.
Abstract:
Magnetic aluminum-based adsorbents (MLDHs) were prepared with a coprecipitation method and used to separate lithium ions from the aqueous solutions. In static adsorption experiment, the adsorption capacity of MLDHs for lithium ions reached 8.22 mg/g. In a mixed solution of various metal ions, the adsorbents exhibited higher selectivity for lithium ions. Kinetic studies indicated that the adsorption process conformed to a pseudo-second-order model. The experimental data were fitted with nonlinear regression using commonly used adsorption isotherms. It was found that the adsorption isotherm process could be described by the Langmuir model. In addition, the thermodynamic parameters revealed that the adsorption of lithium was a spontaneous endothermic process.
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