Citation: LIU Xiaodong, CHEN Qingde, SHEN Xinghai. Adsorption Performance of Thorium Dioxide Nanospheres Towards Uranium in the Aqueous Solution of Ammonium Uranyl Tricarbonate[J]. Chinese Journal of Applied Chemistry, ;2017, 34(10): 1177-1185. doi: 10.11944/j.issn.1000-0518.2017.10.170149 shu

Adsorption Performance of Thorium Dioxide Nanospheres Towards Uranium in the Aqueous Solution of Ammonium Uranyl Tricarbonate

Beijing National Laboratory for Molecular Sciences, Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Corresponding author: CHEN Qingde, qdchen@pku.edu.cn SHEN Xinghai, xshen@pku.edu.cn
Received Date: 11 May 2017
Revised Date: 12 June 2017
Accepted Date: 4 July 2017

Fund Project: Science Challenge Project TZ2016004the National Natural Science Foundation of China 91226112Supported by Science Challenge Project(No.TZ2016004), the National Natural Science Foundation of China(No.U1507203, No.91226112)the National Natural Science Foundation of China U1507203

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Thorium dioxide(ThO₂), a kind of actinide metal oxides, has good performance as adsorbent, but it is necessary to extend their application scope. In the present work, we investigated the adsorption property of ThO₂ nanospheres prepared by hydrothermal method in the aqueous solution of ammonium uranyl tricarbonate. In the presence of 2 mmol/L NH₄HCO₃ and 20 mmol/L tris(hydroxymethyl)aminomethane)-HCl, ThO₂ nanospheres had an adsorption capacity of 6.52 mg/g when the initial concentration of uranium was 20 mg/L, which followed pseudo-second-order kinetic model well. In isothermal adsorption studies, Freundlich model was preferable. The desorption of ThO₂ nanospheres after adsorption was achieved easily by using dilute HCl solution. In the mechanism research, it was found that ThO₂ nanospheres have negative charges under the experiment conditions and adsorb UO₂²⁺ via cation adsorption mechanism. However, the uranium uptake was seriously affected by other cations, such as Ca²⁺, Cu²⁺ and Ni²⁺. This work will contribute to the recovery of uranium from seawater and alkaline/neutral radioactive waste by metal oxides.
- thorium dioxide,
- uranium,
- adsorption,
- ammonium uranyl tricarbonate
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