Department of Civil Engineering, The University of Hong Kong , Pokfulam, Hong Kong.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
Environ Sci Technol. 2017 Feb 21;51(4):2312-2320. doi: 10.1021/acs.est.6b04528. Epub 2017 Feb 10.
The development of environmentally friendly, oxidation-selective advanced oxidation processes (AOPs) for water decontamination is important for resource recovery, carbon dioxide abatement, and cost savings. In this study, we developed an innovative AOP using a combination of peroxymonosulfate (PMS) and iodide ions (I) for the selective removal of phenolic pollutants from aqueous solutions. The results showed that nearly 100% degradation of phenol, bisphenol A, and hydroquinone was achieved after reaction for 4 min in the presence of 65 μM PMS and 50 μM I. PMS-I oxidation had a wide effective pH range, with the best performance achieved under circumneutral conditions. The ratio between [PMS] and [I] influenced the degradation, and the optimal ratio was approximately 1.00 for the degradation of the phenols. Neither sulfate nor hydroxyl radicals were found to be the active species in PMS-I oxidation. Instead, we found evidence that iodide atoms were the dominant oxidants. In addition, both Cl and Br also promoted the degradation of phenol in PMS solution. The results of this work may promote the application of reactive halogen species in water treatment.
开发环保、氧化选择性的高级氧化工艺（AOPs）对于水净化中的资源回收、二氧化碳减排和成本节约非常重要。在这项研究中，我们开发了一种使用过一硫酸盐（PMS）和碘化物离子（I）组合的创新 AOP，用于从水溶液中选择性去除酚类污染物。结果表明，在存在 65 μM PMS 和 50 μM I 的情况下，反应 4 分钟后，酚、双酚 A 和对苯二酚几乎 100%降解。PMS-I 氧化具有较宽的有效 pH 范围，在近中性条件下性能最佳。[PMS]与[I]的比值会影响降解，酚类降解的最佳比值约为 1.00。在 PMS-I 氧化中，既没有发现硫酸盐自由基也没有发现羟基自由基是活性物质。相反，我们发现证据表明碘原子是主要的氧化剂。此外，Cl 和 Br 也促进了 PMS 溶液中苯酚的降解。这项工作的结果可能会促进活性卤素物种在水处理中的应用。
