Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China.
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
Environ Pollut. 2020 Apr;259:113801. doi: 10.1016/j.envpol.2019.113801. Epub 2019 Dec 13.
Via the thermal sintering, a nanocrystalline IrO coating was formed on the Ti substrate to successfully prepare a Ti/IrO electrode. Based on the electrochemical analysis, the prepared Ti/IrO electrode was found to have powerful oxidation effect on the organics in the TNT red water, where the nitro compound was oxidized through an irreversible electrochemical process at 0.6 V vs. SCE. According to the analysis of the nitro compound content, the UV-vis spectra, and the FTIR spectra of 2,4,6-trinitrotoluene (TNT) red water with electrolytic periods, the degradation mechanism of the dinitrotoluene sulfonate (DNTS) was developed. And the intermediates were characterized by UPLC-HRMS. The DNTS mainly occurred one electron transfer reaction on the Ti/IrO electrode. At the early stage of the electrolysis, the polymerization of DNTS was mainly dominated. The generated polymer did not form a polymer film on the electrode surface, but instead it promoted a further reduction. After electrolyzing for 30 h, all NO function group in the TNT red water was degraded completely.
通过热烧结，在 Ti 基底上形成了纳米晶 IrO 涂层，成功制备了 Ti/IrO 电极。通过电化学分析发现，所制备的 Ti/IrO 电极对 TNT 红水中的有机物具有强大的氧化作用，其中硝基化合物在 0.6 V 相对于 SCE 的不可逆电化学过程中被氧化。根据硝基化合物含量分析、UV-vis 光谱和不同电解时间段的 2,4,6-三硝基甲苯（TNT）红水的 FTIR 光谱，提出了二硝基甲苯磺酸盐（DNTS）的降解机制，并通过 UPLC-HRMS 对中间产物进行了表征。DNTS 在 Ti/IrO 电极上主要发生单电子转移反应。在电解的早期阶段，主要是 DNTS 的聚合占主导地位。生成的聚合物并没有在电极表面形成聚合物膜，而是促进了进一步的还原。电解 30 h 后，TNT 红水中的所有 NO 官能团都被完全降解。
