The decatungstate of sodium Na4W10O32 (DTA) was synthesized according to the bibliography and characterized by the UV-visible spectra. It was used for the total degradation of the biocide “Triclosan” (TCS) and the reduction of the hexavalent chromium (Cr6+) into trivalent chromium (Cr3+) in aqueous solutions using ultraviolet radiation. This was achieved through a photocatalytic cycle. The effect of oxygen has been deeply investigated. It appeared essential for decatungstate regeneration since its absence induced the inhibition of Triclosan disappearance and completely stopped the photocatalytic cycle.
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