SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China; School of Environment, South China Normal University, University Town, Guangzhou 510006, China.
School of Energy Science and Engineering, Central South University, Changsha 410083, China.
J Hazard Mater. 2022 Aug 15;436:129223. doi: 10.1016/j.jhazmat.2022.129223. Epub 2022 May 25.
The presence of 1,4-dioxane in various water streams poses a threat to the health of human beings. In this study, the oxidative combination of ozone with peroxymonosulfate (PMS) was for the first time used to remove 1,4-dioxane from water. Near complete abatement of 1,4-dioxane was achieved by ozone-PMS after reaction of only 15 min and the degradation kinetics was found to be positively correlated with doses of PMS and ozone. Ozone-PMS oxidation had the optimum performance at slight base pH values. Both sulfate radicals and hydroxyl radicals were generated in ozone-PMS oxidation and these radicals resulted in the degradation of 1,4-dioxane. The effects of common water constituents and real water matrices were investigated. It was found that bicarbonate ions with a concentration up to 10 mM had a slight promoting effect, while either chloride ions or natural organic matter inhibited only slightly the degradation. Meanwhile, no obvious difference in the degradation of 1,4-dioxane was found among the real water matrices and deionized water, which demonstrates that ozone-PMS oxidation has high tolerance and stability. The results from this study demonstrate that ozone-PMS may be a promising technology for the removal of 1,4-dioxane from various water matrices.
1,4-二恶烷存在于各种水流中，对人类健康构成威胁。在这项研究中，臭氧与过一硫酸盐（PMS）的氧化结合首次被用于从水中去除 1,4-二恶烷。在仅反应 15 分钟后，臭氧-PMS 几乎完全消除了 1,4-二恶烷，降解动力学与 PMS 和臭氧的剂量呈正相关。臭氧-PMS 氧化在轻微碱性 pH 值下具有最佳性能。在臭氧-PMS 氧化中同时生成了硫酸根自由基和羟基自由基，这些自由基导致 1,4-二恶烷的降解。研究了常见水成分和实际水基质的影响。发现浓度高达 10mM 的碳酸氢根离子有轻微的促进作用，而氯离子或天然有机物仅略微抑制了降解。同时，在实际水基质和去离子水中，1,4-二恶烷的降解没有明显差异，这表明臭氧-PMS 氧化具有高耐受性和稳定性。本研究结果表明，臭氧-PMS 可能是一种从各种水基质中去除 1,4-二恶烷的有前途的技术。
