Ministry of Ecology and Environment of the People's Republic of China, Nanjing Institute of Environmental Sciences, Nanjing, 210042, China.
School of Environmental Science, Nanjing XiaoZhuang University, Nanjing, 211171, China.
Bull Environ Contam Toxicol. 2021 Aug;107(2):255-262. doi: 10.1007/s00128-021-03109-7. Epub 2021 Feb 8.
Sulfate radical based-advanced oxidation process has received increasing interest in the remediation of wastewater and contaminated soil. In this study, degradation of 2, 4-dichlorophenol (2, 4-DCP) was investigated over peroxymonosulfate (PMS) activation by MnO, which was prepared by liquid-phase oxidation method. The prepared MnO was characterized by transition electron microscopy, X-ray diffraction, N adsorption-desorption, and X-ray photoelectron spectroscopy. Characterization results showed that α-MnO exhibited the highest surface area and Mn (III) content. The PMS activation by MnO in 2, 4-DCP degradation followed the order of α-MnO > γ-MnO > β-MnO, which is dependent on the properties of MnO including crystal structure, surface area and Mn (III) content. Influences of initial concentration of 2, 4-DCP, PMS and MnO dosage, pH and co-existing inorganic ions on the degradation were examined. Electron paramagnetic resonance (EPR) and quenching experiments with ethanol and tert-butanol suggested that sulfate radicals were the dominant radicals in the process. Findings in this study indicated that α-MnO was an attractive catalyst for activation of PMS to degrade 2, 4-DCP in aqueous solution.
基于硫酸根自由基的高级氧化技术在废水和污染土壤的修复中受到了越来越多的关注。本研究采用液相氧化法制备了 MnO，并考察了其过一硫酸盐（PMS）活化降解 2,4-二氯苯酚（2,4-DCP）的性能。通过透射电子显微镜、X 射线衍射、N2 吸附-脱附和 X 射线光电子能谱对 MnO 进行了表征。结果表明，α-MnO 具有最高的比表面积和 Mn（III）含量，因此其对 2,4-DCP 的降解活性最高，γ-MnO 次之，β-MnO 最低。MnO 对 PMS 活化性能的差异主要取决于 MnO 的晶体结构、比表面积和 Mn（III）含量等性质。考察了 2,4-DCP 的初始浓度、PMS 和 MnO 的用量、pH 值以及共存无机离子对 2,4-DCP 降解的影响。电子顺磁共振（EPR）和乙醇、叔丁醇猝灭实验结果表明，在该过程中硫酸根自由基是主要的活性自由基。本研究结果表明，α-MnO 是一种很有前途的催化剂，可用于 PMS 活化降解水溶液中的 2,4-DCP。
