College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China.
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
Chemosphere. 2021 Jan;262:128067. doi: 10.1016/j.chemosphere.2020.128067. Epub 2020 Aug 23.
The greatest constraint in the advanced oxidation processes involved Fe(II)/PMS was the low utilization of Fe(II) and PMS. In the present study, the co-catalytic effect of WS on the Fe(II)/PMS system for the degradation of organics was investigated. In the presence of WS, Fe(III) was reduced to Fe(II) during the reaction and resulted in improved decomposition of PMS as well as the degradation of 4-chloriphenol (4-CP). The decomposition rate of PMS and degradation efficiency of 4-CP were 10% and 25% in the Fe(II)/PMS process, while the efficiencies respectively increased to 99% and 100% in the WS assisted Fe(II)/PMS system. The degradation of 4-CP was completed via the free radical pathway and SO• played a more important role than other active species. Low concentration of inorganic ions such as Cl and HCO exhibited irrelevant effect while humic acid showed significant suppression on the WS/Fe(II)/PMS system. Additionally, characterization and recycle results implied that WS maintained a good stability during the co-catalytic processes.
在涉及 Fe(II)/PMS 的高级氧化过程中，最大的限制是 Fe(II) 和 PMS 的利用率低。在本研究中，研究了 WS 对 Fe(II)/PMS 体系降解有机物的共催化作用。在 WS 的存在下，Fe(III)在反应过程中被还原为 Fe(II)，从而导致 PMS 的分解以及 4-氯苯酚（4-CP）的降解得到改善。在 Fe(II)/PMS 过程中，PMS 的分解速率和 4-CP 的降解效率分别为 10%和 25%，而在 WS 辅助 Fe(II)/PMS 体系中，效率分别增加到 99%和 100%。4-CP 的降解是通过自由基途径进行的，SO•比其他活性物质发挥更重要的作用。低浓度的无机离子如 Cl 和 HCO 表现出无关紧要的影响，而腐殖酸对 WS/Fe(II)/PMS 体系表现出明显的抑制作用。此外，表征和回收结果表明，WS 在共催化过程中保持良好的稳定性。
