Np（Ⅴ）吸附于纤铁矿/水界面的扩展X射线吸收精细结构（EXAFS）分析

本工作采用原位扩展X射线吸收精细结构（EXAFS）能谱首次揭示了Np（Ⅴ）吸附于合成纤铁矿（γ-FeOOH）表面的化学形态。Np LⅢ边EXAFS分析结果显示Np（Ⅴ）以五价镎酰离子吸附于γ-FeOOH,未发现多核络合物与表面沉淀。傅里叶转化结果在约3（1=0.1nm）附近的能峰可归于Np-Fe配位层,证明了Np（Ⅴ）-γ-FeOOH形成了内层吸附的单一形态表面络合物。所得分析结果与Np（Ⅴ）在相似构成的含铁矿物上的吸附形态结果进行了比较,进一步确认了Np-Fe、Np-O等关键配位层的存在。然而,还需要更多设计良好的EXAFS实验来确认是否存在Np-C配位层,以确认纤铁矿界面是否存在Np碳...

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Bibliographic Details
Published in核化学与放射化学 Vol. 38; no. 4; pp. 225 - 231
Main Author 杨春莉 张生栋
Format Journal Article
LanguageChinese
Published 中国原子能科学研究院 放射化学研究所,北京,102413 2016
Subjects
Artemis软件
Athena软件
EXAFS
Np（Ⅴ）
吸附
纤铁矿
Athena软件
absorption
吸附
Np(Ⅴ)
Artemis软件
Artemis
Athena
EXAFS
lepidocrocite
纤铁矿
Online AccessGet full text
ISSN0253-9950
DOI10.7538/hhx.2016.38.04.0225

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Summary:本工作采用原位扩展X射线吸收精细结构（EXAFS）能谱首次揭示了Np（Ⅴ）吸附于合成纤铁矿（γ-FeOOH）表面的化学形态。Np LⅢ边EXAFS分析结果显示Np（Ⅴ）以五价镎酰离子吸附于γ-FeOOH,未发现多核络合物与表面沉淀。傅里叶转化结果在约3（1=0.1nm）附近的能峰可归于Np-Fe配位层,证明了Np（Ⅴ）-γ-FeOOH形成了内层吸附的单一形态表面络合物。所得分析结果与Np（Ⅴ）在相似构成的含铁矿物上的吸附形态结果进行了比较,进一步确认了Np-Fe、Np-O等关键配位层的存在。然而,还需要更多设计良好的EXAFS实验来确认是否存在Np-C配位层,以确认纤铁矿界面是否存在Np碳酸根表面络合物。
Bibliography:Np（Ⅴ）; EXAFS; lepidocrocite; absorption; Athena; Artemis
11-2045/TL
YANG Chun-li,ZHANG Sheng-dong（China Institute of Atomic Energy, P. O. Box 275（26）,Beijing 102413,China）
This work apply in situ extended X-ray absorption fine structure（EXAFS）to reveal sorption speciation of Np（Ⅴ）on synthetic lepidocrocite（γ-FeOOH）.Np LⅢ-edge EXAFS analysis shows that Np（Ⅴ）is absorbed onγ-FeOOH as neptunyl ion,with no observations of multinuclear surface complexes or surface precipitates.The Fourier transform（FT）magnitude of the EXAFS also shows an obvious peak feature at about 3（1=0.1nm）,that can be attributed to a Np-Fe scattering path,consistent with the formation of an inner sphere Np（Ⅴ）-lepidocrocite surface complex.The EXAFS FT results were compared between Np（Ⅴ）speciation on difference iron mineral phases with similar compositions.However,it remains a question whether or not a Np-C coordination exists,indicating the possible presence of Np（Ⅴ）/carbonate species on the lepidocrocite surface.Additional studies are needed,p
ISSN:0253-9950
DOI:10.7538/hhx.2016.38.04.0225