Citation: ZHANG Lan, WEI Ji-Ying, ZHAO Xuan, LI Fu-Zhi, JIANG Feng. Preparation, Characterization and Sr(Ⅱ) Adsorption Performance of Self-Doped Antimony Oxide[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1923-1931. doi: 10.3866/PKU.WHXB201408201 shu

Preparation, Characterization and Sr(Ⅱ) Adsorption Performance of Self-Doped Antimony Oxide

1.
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China

Received Date: 26 May 2014
Available Online: 20 August 2014
Fund Project:

⁹⁰Sr is an important radionuclide that needs to be removed from radioactive waste water (RWW) in nuclear power plants (NPP) prior to its discharge into the environment. Hydrous antimony oxide is a type of selective adsorbent for Sr(Ⅱ) ions, especially in acid solution. In this paper, a series of self-doped hydrous antimony oxides Sb(Ⅲ)/Sb₂O₅ were prepared by a two-step process in an absolute alcohol solvent, using antimony trichloride as a stable and low-toxic antimony source and H₂O2 solution as an oxidant. UV radiation was used to enhance the oxidation rate of Sb(Ⅲ). The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy analyses, and the effect of the preparation conditions on the composition and structure of the products are discussed. Batch adsorption experiments were performed to study the relationship between the Sb(Ⅲ)/Sb(total) ratio in the oxide adsorbent and the Sr(Ⅱ) adsorption activity. Moreover, the influence of the initial pH of the waste water was investigated. The results showed that Sb(Ⅲ) ions can coexist with Sb(V) and form the solid solution of Sb(Ⅲ)/Sb₂O₅ with cubic pyrochlore structure. Materials with different Sb(Ⅲ)/Sb(total) ratios can be obtained by choosing different alcohols as the solvent and a suitable mixing method of the reactants, as well as by changing the reaction temperature during the oxidation process. Among the as- prepared Sb(Ⅲ)/Sb₂O₅ adsorbents, the sample with a Sb(Ⅲ)/Sb(total) ratio of 49.8% showed the best Sr(Ⅱ) adsorption performance, and the distribution coefficients of Sr(Ⅱ) was about 6.6×107 mL·g^-1. This hydrous antimony oxide showed favorable performance in the wide pH value of pH=3-13. In addition, Sr(Ⅱ) adsorption on the as-prepared material fitted the Langmuir model very well under the conditions studied.
- Middle and low radioactive water,
- Adsorption of strontium ion,
- Inorganic ion-exchange adsorbent,
- Hydrous antimony oxide
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沈阳化工大学材料科学与工程学院沈阳 110142