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- Title
β-Zeolite modified by ethylenediamine for sorption of Th(IV).
- Authors
Liu Peng; Wu Hanyu; Yuan Ni; Yin Zhuoxin; Pan Duoqiang; Wu Wangsuo
- 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 pseudosecond- 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.
- Subjects
ZEOLITES; THORIUM; ETHYLENEDIAMINE; SORPTION; FREUNDLICH isotherm equation
- Publication
Radiochimica Acta, 2017, Vol 105, Issue 6, p463
- ISSN
0033-8230
- Publication type
Article
- DOI
10.1515/ract-2016-2661