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Chemical behavior of neptunium in the presence of technetium in nitric acid media
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Xianming Zhou
,
Hu Zhang
Published/Copyright:
January 20, 2014
Abstract
The chemical behavior of Np is influenced by many factors, such as U(IV), hydrazine, Pu and Tc, which coexist in U/Pu separation stage of PUREX process. Firstly, the reduction of Np(V) to Np(IV) by Tc(IV) was studied in nitric acid media, and the rate equation could be expressed as − d[Np(V)]/dt = k[Np(V)][Tc(IV)]0.8[HNO3]1.2, k = 28.5 ± 0.9 (L/mol)2/min at 25 ℃, the activation energy was Ea = 70.0 kJ/mol. Thereafter, the chemical behavior of Np was investigated in aqueous nitric acid solution containing Tc(VII), U(IV) and N2H4. Np(V) was reduced to Np(IV) quickly, Tc(VII) was reduced to Tc(IV) and U(IV) was oxidized to U(VI) at the same time. Thereafter Np(IV) was entirely reoxidized to Np(V) when U(IV) and hydrazine were completely consumed. The fast reduction of Np(V) was mainly ascribed to Tc(IV). In addition, Tc(VII) and nitric acid had little influence on the fast oxidation of Np(IV).
Received: 2012-10-20
Accepted: 2013-10-7
Published Online: 2014-1-20
Published in Print: 2014-2-28
©2014 Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Frontmatter
- Editorial
- Preface
- New nuclear facilities and their analytical applications in China
- Advances in computational actinide chemistry in China
- Recent advances in study of uranium surface chemistry in China
- Nuclear fuel cycle-oriented actinides separation in China
- Radiopharmaceuticals in China: current status and prospects
- Gas-phase chemistry of Mo, Ru, W, and Os metal carbonyl complexes
- Extraction complexes of Pu(IV) with carbamoylmethylphosphine oxide ligands: A relativistic density functional study
- Solvent extraction of uranium(VI) by a dipicolinamide using a room-temperature ionic liquid
- Evaluation study on a macroporous silica-based isohexyl-BTP adsorbent for minor actinides separation from nitric acid medium
- A density functional theory study of the competitive complexation of pyridine against H2O and Cl−− to Cm3+ and Ce4+
- Chemical behavior of neptunium in the presence of technetium in nitric acid media
- Nitrate conversion and supercritical fluid extraction of UO2-CeO2 solid solution prepared by an electrolytic reduction-coprecipitation method
- An advanced purex process based on salt-free reductants
- Extraction behavior of cesium and some typical fission and non-fission products with a new 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene
- New insight into Eu(III) sorption mechanism at alumina/water interface by batch technique and EXAFS analysis
- Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique
- Extraction and purification of 227Ac and development of solid 219Rn source
- Mechanism of thorium biosorption by the cells of the soil fungal isolate Geotrichum sp. dwc-1
- Carbon-11 labeled stilbene derivatives from natural products for the imaging of Aβ plaques in the brain
- Synthesis, radiolabeling and in vivo biological evaluation of 99mTc-labeled MAG3-based bisnitroimidazole complexes as tumor hypoxia markers
- γ-radiation effect on dicyclohexano-18-crown-6 aqueous solution in the presence of metal cations
