Simultaneous elimination of N,N-dimethylhydrazine compounds and its oxidation by-product N-nitrosodimethylamine by UV-activated peroxymonosulfate process: Multiple-path mechanism validation and toxicity alteration

被引：9

作者：

Shen, Linlu ^{[1
]}

Wang, Hongyi ^{[2
]}

Kang, Jing ^{[1
]}

Shen, Jimin ^{[1
]}

Yan, Pengwei ^{[1
]}

Gong, Yingxu ^{[1
]}

Zhang, Jiaxu ^{[2
]}

Fu, Gang ^{[2
]}

Wang, Shuyu ^{[1
]}

Cheng, Yizhen ^{[1
]}

Zhao, Shengxin ^{[1
]}

Chen, Zhonglin ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resources & Environm, Harbin 150090, Peoples R China

[2] Harbin Inst Technol, Sch Chem & Chem Engn, State Key Lab Adv Welding & Joining, MIIT Key Lab Crit Mat Technol New Energy Convers &, Harbin 150001, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 474卷

关键词：

N-nitrosodimethylamine; Ultraviolet/peroxymonosulfate; DFT calculation; Mitigation mechanism; Toxicity reduction; REACTION-KINETICS; DRINKING-WATER; NDMA FORMATION; WASTE-WATER; HYDROXYL RADICALS; CHLORINE DIOXIDE; DEGRADATION; PRECURSORS; OZONATION; SULFATE;

D O I：

10.1016/j.cej.2023.145837

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, the ultraviolet/peroxymonosulfate (UV/PMS) process was found to be an efficient and safe strategy for simultaneously controlling NDMA during the degradation of N,N-dimethylhydrazine compounds, such as 1,1,1 ',1 '-Tetramethyl-4,4 '-(methylene-di-p-phenylene) disemicarbazide (TMDS). The distinct roles of sulfate radicals (SO4 center dot-), hydroxyl radicals (HO center dot), PMS, and UV in TMDS degradation as well as NDMA formation and elimination, have been elucidated, involving the kinetics and multiple-path transformation mechanisms. Moreover, to assess the feasibility of this process, a comprehensive toxicity assessment of treated water for zebrafish embryos was conducted. Mineralization analysis and an assessment of electrical energy per order (EE/ O) were performed on actual water samples. The results indicate that SO4 center dot-, HO center dot, PMS, and UV together degraded TMDS, but only SO4 center dot- and PMS led to NDMA formation. UV irradiation may coordinate SO4 center dot- and HO center dot to overcome the energy barriers of NDMA elimination by providing continuous energy. The degradation of TMDS involved hydroxylation, radical addition, bond cleavage and nitrosation. Notably, NDMA formation may be closely related to the electron transfer between SO4 center dot- or PMS and TMDS. Subsequently, the generated NDMA was controlled through photocleavage, radical addition, and hydroxylation. Additionally, the results of toxicity evaluation and EE/O analysis suggest UV/PMS is safe and has the potential for treating N,N-dimethylhydrazine compounds-containing water.

引用

页数：12

共 70 条

[41] Photochemical Production of Carbon Monoxide from Dissolved Organic Matter: Role of Lignin Methoxyarene Functional Groups [J].