期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 394, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122578
关键词
Graphitic carbon nitride; Nonmetal dual doping; Electronic structure; Persulfate; Electron transfer
资金
- National Natural Science Foundation of China [51808142, 51838005, 51538013]
- National Key Research and Development Plan [2016YFA0203200]
- Pearl River Talent Recruitment Program of Guangdong Province
- Science Starting Foundation of Guangzhou University [69-18ZX10299]
Earth-abundant, environmental-benign and durable catalysts are of paramount importance for remediation of organic pollutants, and graphitic carbon nitride (g-C3N4) is a promising nonmetallic material for this application. However, the catalytic oxidation on g-C3N4 suffers from low efficiency because of its chemical inertness if not irradiated with light. Herein, we develop a facile copolymerization strategy for the synthesis of carbon and oxygen dual-doped g-C3N4 using urea as g-C3N4 precursor and ascorbic acid (AA) as carbon and oxygen sources, which induces electronic structure reconfiguration. By replacing AA with other organic precursors, a series of C and O dual-doped g-C3N4 are successfully prepared, demonstrating the generally of the developed methodology. As a demonstration, the C and O dual-doped g-C3N4 using AA as the organic precursor (CN-AA(0.3)) exhibits pronouncedly enhanced catalytic activity in peroxymonosulfate (PMS) activation for organic pollutant degradation without light irradiation compared with pristine g-C3N4 and single oxygen-doped g-C3N4. Experimental and theoretical results revealed the electron-poor C atoms and electron-rich O atoms as active sites for PMS activation in terms of simultaneous PMS oxidation and reduction. This work offers a universal approach to synthesize nonmetal dual-doped g-C3N4 with reconfigured electronic structure, stimulating the development of g-C3N4-based materials for diverse environmental applications.
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