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New Insights into the Generation of Singlet Oxygen in the Metal-Free Peroxymonosulfate Activation Process: Important Role of Electron-Deficient Carbon Atoms
被引:506
作者:

Gao, Yaowen
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Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China

Chen, Zhenhuan
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Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China

Zhu, Yue
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Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China

Li, Tong
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机构:
Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China

Hu, Chun
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h-index: 0
机构:
Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China
Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China
机构:
[1] Guangzhou Univ, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Inst Environm Res Greater Bay, Guangzhou 510006, Peoples R China
[2] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
基金:
中国国家自然科学基金;
关键词:
WASTE-WATER TREATMENT;
ADVANCED OXIDATION;
HETEROGENEOUS CATALYSTS;
BISPHENOL-A;
DEGRADATION;
PERSULFATE;
CHALLENGES;
REDUCTION;
GRAPHENE;
REMOVAL;
D O I:
10.1021/acs.est.9b05856
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
A nonradical oxidation process via metal-free peroxymonosulfate (PMS) activation has recently attracted considerable attention for organic pollutant degradation; however, the origin of singlet oxygen (O-1(2)) generation still remains controversial. In this study, nitrogen-doped carbon nanosheets (NCN-900) derived from graphitic carbon nitride were developed for activation of PMS and elucidation of O-1(2) production. With a large specific surface area (1218.7 m(2) g(-1)) and high nitrogen content (14.5 at %), NCN-900 exhibits superior catalytic activity in PMS activation, as evidenced by complete degradation of bisphenol A within 2 min using 0.1 g L-1 NCN-900 and 2 mM PMS. Moreover, the reaction rate constant fitted by pseudo-first-order kinetics for NCN-900 reaches an impressive value of 3.1 min(-1). Electron paramagnetic resonance measurements and quenching tests verified O-1(2) as the primary reactive oxygen 900/PMS system. Based on X-ray photoelectron spectroscopy analysis and theoretical calculations, an unexpected generation pathway of O-1(2) involving PMS oxidation over the electron-deficient carbon atoms neighboring graphitic N in NCN-900 was unraveled. Besides, the NCN-900/PMS system is also applicable for remediation of actual industrial wastewater. This work highlights the important role of electron-deficient carbon atoms in O-1(2) generation from PMS oxidation and furnishes theoretical support for further relevant studies.
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页码:1232 / 1241
页数:10
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