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Adsorption of U（Ⅵ）、Th（Ⅳ） and Eu（Ⅲ） on γ-Al2O3

Author: YanChao
Tutor: WuWangSuo；GuoZhiJun
School: Lanzhou University
Course: Applied Chemistry
Keywords: U (Ⅵ) Th (Ⅳ) Eu (Ⅲ) P (Ⅴ) FA γ-Al2O3 Adsorption Surface complexation model
CLC: O647.31
Type: Master's thesis
Year: 2009
Downloads: 56
Quote: 0
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Abstract


The static method research, U (Ⅵ), Th (Ⅳ) and Eu (Ⅲ) 2 O 3 on the adsorption behavior of the γ-Al explore the solid contact time, pH, ionic strength, phosphate P (Ⅴ) and fulvic acid FA factors such as adsorption liquid ratio (m / v), and U (Ⅵ) and phosphate adsorption and coadsorption surface coordination model for quantitative interpretation. U (Ⅵ) and P (Ⅴ) in γ-Al 2 O 3 adsorption experimental results show that: P (V) of the adsorption percentage increases with pH first gradually increased and reached the maximum at pH = 5.2, and later gradually reduced; adsorption of U (VI) the percentage gradually increased with pH, ??and pH 4 ~ 6 from 8% to 97%, when the pH> 6 when the basic no longer changes. Changes in the ionic strength of the adsorption of P (V) of little effect, but the adsorption of U (Ⅵ) a slight increase with decreasing the ionic strength. Coadsorption system, the presence of U (VI) of P (V) of the adsorption basically no effect, but the presence of P (Ⅴ) and FA adsorption of U (VI) of a very large role in promoting. In the model calculations, we also consider the γ-Al 2 O 3 dissolution CO 2 adsorption. P (Ⅴ) adsorption system mainly consider ≡ XOHAlHPO 4 , ≡ XH 2 PO 4 , ≡ XHPO 4 - and ≡ the XPO is 4 2 - four surface complexes; U (Ⅵ) adsorption system in the main consider the the the ≡ XOUO 2 ≡ XOUO 2 (OH) 2 - two surface complexes. Th (IV) adsorption percentage of followers increased from 7% to 95% at a pH of 3-5, after basically no longer change. With the percentage of the increase in the ionic strength of the Th (Ⅳ) adsorption decreased slightly. Of the adsorption system, the presence of P (V) and FA sorption of Th (Ⅳ) have a very large role in promoting. Eu (Ⅲ) adsorption percentage with pH gradually increased, an adsorption percentage from 5% to 98% 5-6. Eu (Ⅲ) in the γ-Al 2 O 3 on adsorption is highly dependent on the pH of the solution, indicating that formation of the inner ring complex is the primary adsorption mechanism . In the model to calculate the main consideration the ≡ XOEu 2 the the ≡ XOEu (OH) ≡ XOEu (OH) 3 three kinds of complexes. Ternary and quaternary coexistence system, the presence of P (V) and the FA will significantly promote the adsorption of Eu (Ⅲ).

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Adsorption > Adsorption theory
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