Abstract
Adsorption of Cu2+ and Co2+ from aqueous solution using zeolite synthesized from coal gangue was examined at room temperature. Batch experiments were carried out to investigate the effects of contact time, initial ion concentration, and pH on the adsorption process. Under comparable conditions, the adsorption greatly depended on initial ion concentration and pH. Different isotherms were applied to describe equilibrium data, and the results turned out that adsorption data can be better fitted with Langmuir, Temkin, and Dubinin–Radushkevich models, indicating monolayer coverage of adsorption sites on the surface of zeolite NaX and a physical process for Co2+ and Cu2+ adsorption. Adsorption capacity calculated from Langmuir was 45.05 mg/g for Cu2+ and 44.53 mg/g for Co2+. The adsorption kinetic could be better described with the pseudo-second-order model, and the removal mechanism of Co2+ and Cu2+ by the synthesized zeolite NaX was governed by surface adsorption, film diffusion, and intra-particle diffusion. The work suggests that coal gangue-derived zeolite NaX can be used as an alternative economical adsorbent for metal ions removal.
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Acknowledgements
The research was supported by the National Natural Science Foundation of China through Grant 41271510, the Research and Development Project of Science and Technology of Shaanxi Province through Grant 2014K15-01-05, and the Fundamental Research Funds for the Central University through Grants GK201601009. Fuqiang Zhao participated in sampling work at the early stage of the project.
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Lu, X., Shi, D. & Chen, J. Sorption of Cu2+ and Co2+ using zeolite synthesized from coal gangue: isotherm and kinetic studies. Environ Earth Sci 76, 591 (2017). https://doi.org/10.1007/s12665-017-6923-z
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DOI: https://doi.org/10.1007/s12665-017-6923-z