The reaction between HTcO(4) and MeOH in 13 M H(2)SO(4) was investigated by (99)Tc NMR, UV-visible and X-ray absorption fine structure (XAFS) spectroscopy. Experimental results and first principles calculations show the formation of Tc(+5) sulfate complexes. The results expand the fundamental understanding of Tc in high acid solutions.

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Technetium disulfide was prepared by reaction between the elements in a sealed tube at 450 °C, by reaction between Tc2(O2CCH3)5 and H2S gas in a flowing system at 450 °C and by reaction between K2TcCl6 and H2S gas in sulfuric acid. The samples were analysed by X-ray absorption fine structure (XAFS) spectroscopy.

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Development of techniques for the separation and removal of uranium from wastewater and other sources is an active area of research because of the increasing demand for uranium for nuclear energy generation. However, reusable adsorption materials with specific sizes and uniform shapes that can exhibit high affinity for uranium are still scarce. In this work, we describe the modification of an acrylic micropolymer resin with desferrioxamine B and the evaluation of its adsorption property for uranium(VI). The obtained microparticles with specific sizes exhibit a uniform spherical shape, thus enabling the design of either batch or continuous flow column adsorption systems with good adsorption ability for U(VI) and can endure highpressure conditions [at least 100 kgf/cm 2 (equal to 9.8 MPa)]. The mechanism of adsorption is investigated using chemical kinetics and thermodynamics. Selectivity experiments reveal that the present system adsorbs U selectively in the presence of high competitive ion concentrations. Furthermore, the reusability of the resin after 10 adsorption−desorption cycles is demonstrated.