A Novel Approach to the Oxidation Potential of the Tc(VII)/Tc(IV) Couple in Hydrochloric Acid Medium through the Reduction of TCO-
 4 by Fe2+ Ion

Under oxic conditions, Tc exists as the soluble, weakly sorbing pertechnetate [TcO4-] anion. The reduced form of technetium, Tc(IV), is stable in anoxic environments and is sparingly soluble as TcO2 x nH2O(s). Here we investigate the heterogeneous reduction of Tc(VII) by Fe(II) adsorbed on Al (hydr)oxides [diaspore (alpha-AlOOH) and corundum (alpha-Al2O3)]. Experiments were performed to study the kinetics of Tc(VII) reduction, examine changes in Fe surface speciation during Tc(VII) reduction (Mössbauer spectroscopy), and identify the nature of Tc(IV)-containing reaction products (X-ray absorption spectroscopy). We found that Tc(VII) was completely reduced by adsorbed Fe(II) within 11 (diaspore suspension) and 4 days (corundum suspension). Mössbauer measurements revealed thatthe Fe(II) signal became less intense with Tc(VII) reduction and was accompanied by an increase in the intensity of the Fe(III) doublet and magnetically ordered Fe(III) sextet signals. Tc-EXAFS spectroscopy revealed that the final heterogeneous redox product on corundum was similar to Tc(IV) oxyhydroxide, TcO2 x nH2O.

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A Novel Approach to the Oxidation Potential of the Tc(VII)/Tc(IV) Couple in Hydrochloric Acid Medium through the Reduction of TCO^- ₄ by Fe²⁺ Ion

Cited by 10 publications

References 17 publications

Time dependent zero valent iron oxidation and the reductive removal of pertechnetate at variable pH

Time dependent zero valent iron oxidation and the reductive removal of pertechnetate at variable pH

Microbial reduction of 99Tc in organic matter-rich soils

Reduction of Tc(VII) by Fe(II) Sorbed on Al (hydr)oxides

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A Novel Approach to the Oxidation Potential of the Tc(VII)/Tc(IV) Couple in Hydrochloric Acid Medium through the Reduction of TCO- 4 by Fe2+ Ion

Cited by 10 publications

References 17 publications

Time dependent zero valent iron oxidation and the reductive removal of pertechnetate at variable pH

Time dependent zero valent iron oxidation and the reductive removal of pertechnetate at variable pH

Microbial reduction of 99Tc in organic matter-rich soils

Reduction of Tc(VII) by Fe(II) Sorbed on Al (hydr)oxides

Contact Info

Product

Resources

About

A Novel Approach to the Oxidation Potential of the Tc(VII)/Tc(IV) Couple in Hydrochloric Acid Medium through the Reduction of TCO^- ₄ by Fe²⁺ Ion