Abstract
β-Zeolite-EDA was modified with ethylenediamine (EDA) after synthesized. The synthesized material was characterized and used for removal of Th(IV) from aqueous solutions. The influences of pH, ionic strength, contact time, temperature and humic acid (HA) on Th(IV) sorption onto synthesized β-zeolite-EDA was studied by batch technique. The dynamic process showed that the sorption of Th(IV) onto β-zeolite-EDA matched the pseudo-second-order kinetics model. The sorption of Th(IV) on β-zeolite-EDA was significantly dependent on pH values, the sorption percentage increased markedly at pH 3.5–4.5, and then maintained a steady state as pH values increased. Through simulating the sorption isotherms by Langmuir, Freundlich and Dubini–Radushkevich (D–R) models, it could be seen respectively that the sorption pattern of Th(IV) on β-zeolite-EDA was mainly controlled by surface complexation, and that the sorption processes was endothermic and spontaneous. The presence of HA increased Th(IV) sorption on β-zeolite-EDA.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 21327801
Award Identifier / Grant number: 41573128
Award Identifier / Grant number: 21601179
Funding statement: Supported by the National Natural Science Foundation of China (21327801, 41573128, 21601179) and Fundamental Research Funds for the Central University (lzujbky-2015-70).
Acknowledgments
Supported by the National Natural Science Foundation of China (21327801, 41573128, 21601179) and Fundamental Research Funds for the Central University (lzujbky-2015-70).
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