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

doi:10.11944/j.issn.1000-0518.2017.10.170149

Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (10): 1177-1185.DOI: 10.11944/j.issn.1000-0518.2017.10.170149

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

LIU Xiaodong,CHEN Qingde(),SHEN Xinghai()

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

Received:2017-05-11 Accepted:2017-07-04 Published:2017-09-29 Online:2017-09-29
Contact: CHEN Qingde,SHEN Xinghai
Supported by:
Supported by Science Challenge Project(No.TZ2016004), the National Natural Science Foundation of China(No.U1507203, No.91226112)

Abstract

Abstract:

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.

Key words: thorium dioxide, uranium, adsorption, ammonium uranyl tricarbonate

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.

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

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