Decomposition of Thiourea Dioxide under Aerobic and Anaerobic Conditions in an Aqueous Alkaline Solution

One-step removal of hexavalent chromium in wide pH range using thiourea dioxide: the role of reactive species

“…The stability of TD became poor under alkaline condition, because OH − acted as a nucleophilic agent to attack the carbon center, resulting the breaking of C–S bond and the formation of urea and SO 2 2− (eqn (2)). 26,27 As a strong reducing species (−1.12 to −0.74 V), 28 sulfoxylate could reduce Cr( vi ) to Cr( iii ) (eqn (3)). 29 Further, SO 3 ˙ − was also simultaneously generated during the reduction process (eqn (4)).…”

“…The m/z 2)). 26,27 As a strong reducing species (−1.12 to −0.74 V), 28 sulfoxylate could reduce Cr(VI) to Cr(III) (eqn ( 3)). 29 Further, SO 3 c − was also simultaneously generated during the reduction process (eqn ( 4)).…”