Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 317, Issue 3, Pages 1349-1360Publisher
SPRINGER
DOI: 10.1007/s10967-018-5992-0
Keywords
Adsorption; U(VI); Graphene oxide; Bentonite
Funding
- National Natural Science Foundation of China [11475080]
- Hunan Natural Science Foundation [2018JJ3420]
- Graduate Student Research Innovation Project of Hunan Province [CX2016B427]
- General Program of the Hunan Provincial Education Department [15C1178]
- Research Learning and Innovative Experimental Plan for College students [2017XJXZ012]
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A novel graphene oxide/bentonite composite (GO/bentonite) was synthesized and then characterized through powder X-ray diffraction, fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and energy dispersive spectroscopy. Adsorption achieved equilibrium within 10 min. Moreover, U(VI) adsorption on GO/bentonite was highly dependent on solution pH and independent of ionic strength. These characteristics suggested that inner-sphere surface complexes of U(VI) formed on GO/bentonite. The adsorption of U(VI) from aqueous solution on GO/bentonite was fitted to the pseudo-second-order and Freundlich isotherm models. The maximum sorption capacity of GO/bentonite was 234.19 mg g(-1) under neutral pH at 303 K. GO/bentonite is a potentially powerful adsorbent for the efficient removal of U(VI) from aqueous solutions.
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