臭氧氧化法同时去除水中 2,4,6-三溴苯酚和减少溴酸盐离子生成。
Simultaneous removal of 2,4,6-tribromophenol from water and bromate ion minimization by ozonation.
机构信息
Department of Chemistry, Mangosuthu University of Technology, PO Box 12363, Jacobs, 4026, South Africa.
School of Chemistry, Westville Campus, University of KwaZulu-Natal, P Bag X54001, Durban, 4000, South Africa.
出版信息
J Hazard Mater. 2018 Sep 5;357:415-423. doi: 10.1016/j.jhazmat.2018.06.006. Epub 2018 Jun 2.
The study investigates the degradation of 2,4,6-tribromophenol (2,4,6-TBP) and the influence of solution pH, alkalinity, HO and O dosage. Debromination efficiency of 2,4,6-TBP was the highest in basic water (pH = 10.61). The extent of TOC removal compared favourably with the amount of substrate converted, suggesting favourable mineralization of oxygenated by-products (OBPs). Ozonation in basic water favoured the formation of toxicBrO, while in acidic water (pH = 2.27) BrO yield was lowest. In acidic water the presence of CO showed negligible effect on conversion, TOC and BrO yield compared to ozonation alone. In basic water both 2,4,6-TBP conversion and TOC removal decreased with an increase in CO, hence minimizing BrO formation. The O/HO process showed an improvement in the debromination efficiency and TOC data revealed that total mineralization of OBP's was achieved. However, only 10% HO was able to effectively decrease BrO formation. Increasing the ozone concentration from 20 to 100 ppm enhanced the conversion of 2,4,6-TBP and TOC removal. At low ozone concentrations poor mineralization of OBP's occurred, while complete mineralization was achieved at higher ozone dose. The reaction pathways for ozone degradation of 2,4,6-TBP in acidic and basic waters is proposed.
该研究考察了 2,4,6-三溴苯酚（2,4,6-TBP）的降解以及溶液 pH 值、碱度、HO 和 O 用量的影响。在碱性水中（pH=10.61），2,4,6-TBP 的脱溴效率最高。TOC 的去除程度与转化的底物量相当，表明含氧副产物（OBPs）的有利矿化。在碱性水中，臭氧化有利于有毒 BrO 的形成，而在酸性水（pH=2.27）中 BrO 的产率最低。在酸性水中，与单独臭氧化相比，CO 的存在对转化率、TOC 和 BrO 产率几乎没有影响。在碱性水中，随着 CO 的增加，2,4,6-TBP 的转化率和 TOC 的去除率均降低，从而最大限度地减少了 BrO 的形成。O/HO 工艺提高了脱溴效率，TOC 数据表明 OBP 的总矿化得以实现。然而，只有 10%的 HO 能够有效地减少 BrO 的形成。将臭氧浓度从 20 ppm 增加到 100 ppm 提高了 2,4,6-TBP 的转化率和 TOC 的去除率。在低臭氧浓度下，OBPs 的矿化作用较差，而在较高的臭氧剂量下则实现了完全矿化。提出了酸性和碱性水中臭氧降解 2,4,6-TBP 的反应途径。
Zotero 插件