The decomposition mechanism for TDO in aqueous solution within 25–95 °C temperature range

• Published in: Chemical physics letters Vol. 731; p. 136603
• Main Authors: Shao, Jianzhong, Liu, Xiaoyun, Makarov, Sergei V., Pei, Kemei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 16.09.2019
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2019.136603

[Display omitted] •There are three stages for TDO decomposition in water within 25 °C–95 °C.•The reducing substance in the instantaneous system increases the reduction performance increases.•TDO decomposes from 55 °C, and H2SO2 can be oxidized into H2SO3 and H2SO4 within 55 °C–95 °C. In this paper, the decomposition mechanism of Thiourea dioxide (TDO) aqueous solution in 25–95 °C temperature range were studied in detail by electrode potential method, time-of-flight mass spectrometry (TOF-MS), Raman spectroscopy and quantum chemistry calculations. Oxidation-Reduction Potential (ORP) were used to reveal the effect of temperature on the reduction performance of TDO. TOF-MS and Raman spectroscopy were used to determine the chemical constituents of TDO solution at different temperatures. Quantum chemistry calculations were used to assign Raman spectra. This work provides solid theoretical and experimental evidences for the decomposition mechanism of TDO in moisture-hot condition.\