The Present Status of Technetium Chemistry

Schwochau, K.

doi:10.1524/ract.1983.32.13.139

Cited by 81 publications

(30 citation statements)

References 106 publications

(152 reference statements)

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“…This is why Tc is also bound by proteins [8]. The complex chemistry of Tc has been extensively studied [1,12,13,14] and several recipes have been developed to bring Tc into a chemical form suitable for localization of diseases or misfunctions at certain places of the body.…”

Section: Technetium In Nuclear Medicinementioning

confidence: 99%

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Lieser

1993

Radiochimica Acta

112

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Technetium / Nuclear fuel cycle / Medicine / Environment / Radionuclide generator / Radionuclide purity SummaryFormation of ''To in nuclear reactors and the fate of Tc in reprocessing plants are described. "Mo/'''"Tc radionuclide generators for use in nuclear medicine, the production of the importance of nuclear purity control and the selection of suitable Compounds of Tc are discussed. The ways by which Tc may enter the environment, the dissolution of TCO2 and the different migration and Sorption behaviour of Tc(IV) and Tc(Vll) are explained and the importance of the interaction of Tc with organic Compounds is emphasized.

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Section: Technetium In Nuclear Medicinementioning

confidence: 99%

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Lieser

1993

Radiochimica Acta

112

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“…Then the only oxidant might be Tc(VI), for Tc(V) was unstable. The standard electrode potential of Tc and Np in 1 M HNO 3 solution was (NpO 2 + /Np 4+ ) = 0.739 V, (TcO 4 2− /TcO 2+ ) = 1.291 V [18,19], the gap between the two potentials was above 0.2 V, so Np(IV) could be easily oxidized by Tc(VI). The possible mechanism might be as follow:…”

Section: Influence Of Hno 2 On the Oxidation Of Np(iv)mentioning

confidence: 99%

Chemical behavior of neptunium in the presence of technetium in nitric acid media

Zhou¹,

Guoan²,

Zhang³

et al. 2014

Radiochimica Acta

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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)]/d = [Np(V)][Tc(IV)] 0.8 [HNO 3 ] 1.2 ,= 28.5 ± 0.9 (L/mol) 2 /min at 25 ∘ C, the activation energy was a = 70.0 kJ/mol. Thereafter, the chemical behavior

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“…Technetium-99 ( 99 Tc) is a pure β-emitter radionuclide with a half-life of 2.13 × 10 5 years. It is formed in the thermal neutron fission of 235 U with high yield (6%) [1] [2] and by spontaneous fission of 238 U in the earth's crust [3]. It also appears environmentally from the decay of the medical radioisotope 99m Tc (6.0 h half-life) [4].…”

Section: Introductionmentioning

confidence: 99%

Removal of Technetium (<sup>99</sup>Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon

Abdellah¹,

El-Ahwany²,

El-Sheikh³

2020

JASMI

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Technetium-99 is a radioactive isotope with a half-life of 2.13 × 10 5 year. 99 Tc is a significant contaminant of concern to the world. For this reason, a detailed understanding of technetium chemistry is essential for the protecting the public and the environment especially after increasing the various applications and uses of isotopes in the medical practices. Therefore, treatment of waste increases prior to the safe discharge to the environment or the storage. The sorption of technetium in the form of pertechnetate on a nano manganese oxide loaded into activated carbon has been investigated. Nano manganese oxide (NMO) was synthesized from manganese chloride and potassium permanganate by co-precipitation and forming a new composite by loading a nanoparticle into a modified activated carbon by different ratios. Modifications of activated carbons using different concentrations of HNO 3 (4 M, 6 M and 8 M) are used in prepared composites. Fourier transform infrared spectroscopy (FT-IR), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to characterize the prepared composites. The adsorption of 99 4 TcO − anions from low level radioactive aqueous waste was examined using batch technique. Different parameters affecting on the adsorption process were studied for the removal of 99 4 TcO − . The results revealed that NMO/AC (4 M, 6 M and 8 M) has a high adsorption efficiency (93.57%, 90.3% and 90.3%) respectively compared to NMO and AC which have a lower adsorption efficiency (41% and 38.9%) respectively. Moreover, the adsorption isotherm belonged to Freundlich model, the adsorption data followed pseudo-second order model and the thermodynamic study indicated that the adsorption of 99 4 TcO − on Nano-composites was an exothermic and spontaneous process.

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The Present Status of Technetium Chemistry

Cited by 81 publications

References 106 publications

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Chemical behavior of neptunium in the presence of technetium in nitric acid media

Removal of Technetium (<sup>99</sup>Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon

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The Present Status of Technetium Chemistry

Cited by 81 publications

References 106 publications

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Technetium in the Nuclear Fuel Cycle, in Medicine and in the Environment

Chemical behavior of neptunium in the presence of technetium in nitric acid media

Removal of Technetium (&lt;sup&gt;99&lt;/sup&gt;Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon

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Removal of Technetium (<sup>99</sup>Tc) from Aqueous Waste by Manganese Oxide Nanoparticles Loaded into Activated Carbon