School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China.
Chemosphere. 2023 May;324:138338. doi: 10.1016/j.chemosphere.2023.138338. Epub 2023 Mar 9.
MnO activating HO is a promising way in the field of advanced oxidation processes (AOPs) and in situ chemical oxidation (ISCO) to remove contaminants. However, few studies have focused on the influence of various environmental conditions on the performance of MnO-HO process, which restricts the application in real world. In this study, the effect of essential environmental factors (ionic strength, pH, specific anions and cations, dissolved organic matter (DOM), SiO) on the decomposition of HO by MnO (ε-MnO and β-MnO) were investigated. The results suggested that HO degradation was negatively correlated with ionic strength and strongly inhibited under low pH conditions and with phosphate existence. DOM had a slight inhibitory effect while Br, Ca, Mn and SiO placed negligible impact on this process. Interestingly, HCO inhibited the reaction at low concentrations but promoted HO decomposition at high concentrations, possibly due to the formation of peroxymonocarbonate. This study may provide a more comprehensive reference for potential application of HO activation by MnO in different water systems.
MnO 活化 HO 是高级氧化工艺（AOPs）和原位化学氧化（ISCO）领域中去除污染物的一种很有前途的方法。然而，很少有研究关注各种环境条件对 MnO-HO 工艺性能的影响，这限制了其在实际中的应用。在本研究中，考察了基本环境因素（离子强度、pH 值、特定阴离子和阳离子、溶解有机物（DOM）、SiO）对 MnO（ε-MnO 和 β-MnO）分解 HO 的影响。结果表明，HO 的降解与离子强度呈负相关，在低 pH 值条件下和存在磷酸盐时受到强烈抑制。DOM 有轻微的抑制作用，而 Br、Ca、Mn 和 SiO 对该过程没有影响。有趣的是，HCO 在低浓度时抑制反应，但在高浓度时促进 HO 分解，这可能是由于过一碳酸盐的形成。本研究可为 MnO 活化 HO 在不同水系统中的潜在应用提供更全面的参考。
