Sorption of Np(V), Pu(V), and Pu(IV) on colloids of Fe(III) oxides and hydrous oxides and MnO2

被引：15

作者：

Khasanova A.B. ^{[1
]}

Shcherbina N.S. ^{[1
]}

Kalmykov S.N. ^{[1
]}

Teterin Yu.A. ^{[2
]}

Novikov A.P. ^{[3
]}

机构：

[1] Chemistry Faculty, Lomonosov State University, Moscow

[2] Russian Research Centre, Kurchatov Institute, Moscow

[3] Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow

来源：

Radiochemistry | 2007年 / 49卷 / 4期

基金：

俄罗斯基础研究基金会;

关键词：

68.43.-h; 82.70.Dd; 89.60.Ec;

D O I：

10.1134/S1066362207040170

中图分类号：

学科分类号：

摘要：

Sorption of Np(V), Pu(V), and Pu(IV) on colloids of synthetic goethite (α-FeOOH), hematite (α-Fe2O3), maghemite (γ-Fe2O3), and amorphous MnO2 was studied over wide ranges of solution pH and ionic strength by solvent extraction and X-ray photoelectron spectroscopy (XPS). Plutonium(V) is reduced upon sorption on α-FeOOH, but not on α-Fe2O3 and γ-Fe2O3. On the MnO2 surface, Pu occurs as Pu(VI). From the pH dependences of the actinide sorption, the equilibrium constants of the reactions of Np(V)O 2 + and Pu(V)O 2 + with the surface hydroxy groups of the investigated colloid particles and a set of the equilibrium constants of the reactions of Pu(IV) hydroxo complexes with α-FeOOH were obtained. If no redox reactions occur on the surface of the colloid particles, these constants decrease in the order K MnO2 > K - FeOOH > K - Fe K - Fe. © 2007 Pleiades Publishing, Inc.

引用

页码：419 / 425

页数：6

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