Peroxymonosulfate activation by vacuum ultraviolet and trace copper ions: A new way to boost Cu(II)/Cu(I) redox cycle

被引：24
|
作者：
Zhang, Bin [1 ]
Han, Ziwen [1 ]
Xin, Yanjun [2 ]
Zhang, Yanjie [1 ]
Li, Wenqian [1 ]
Li, Boda [1 ]
Ding, An [1 ]
Ma, Jun [1 ]
He, Xu [1 ]
机构：
[1] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
[2] Qingdao Agr Univ, Coll Resource & Environm, Qingdao Engn Res Ctr Rural Environm, Qingdao 266109, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2022年 / 450卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Vacuum ultraviolet; Trace copper ions; Peroxymonosulfate activation; Hydrated electron and active hydrogen atoms; Cu(II)/Cu(I) redox cycle; HYDROXYL RADICALS; AQUEOUS-SOLUTIONS; SULFATE RADICALS; RATE CONSTANTS; UV-RADIATION; DEGRADATION; WATER; OXIDATION; KINETICS; PH;
D O I：
10.1016/j.cej.2022.138097
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Herein, vacuum ultraviolet (VUV) was introduced to enhance the activation rate of peroxymonosulfate (PMS) by copper ions for the first time. Compared with ultraviolet (UV), the redox cycle rate of Cu(II)/Cu(I) was prominently enhanced by VUV due to the combined driving effect of UV, hydrated electron and active hydrogen atoms. The accelerated Cu(II)/Cu(I) cycle in VUV/PMS/Cu(II) system led to 2.89 times higher degradation efficiency of 2,4-dichlomphenol (2,4-DCP) than that by UV/PMS/Cu(II) system. More importantly, the initial Cu(II) concentration (5 kik4) in VUV/PMS/Cu(II) system was only 1/5 of the guideline value in WHO standards for drinking water, and the initial PMS concentration was also 1 order of magnitude lower than that in most PMS based systems for water treatment. Furthermore, the reaction mechanism and possible degradation pathways of 2,4-DCP were also proposed. This study verified the possibility for the utilization of trace Cu(II) in water to decompose refractory micro-pollutants by PMS activation.
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页数：12
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