Journal
CHEMICAL ENGINEERING JOURNAL
Volume 218, Issue -, Pages 183-190Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.12.033
Keywords
C3N4; Photocatalysis; 2,4,6-TCP; Superoxide radical; VB holes
Categories
Funding
- National Natural Science Foundation of China [41076040, 20807036]
- Yantai Science & Technology Bureau [2010160]
- Training Program for Young Teachers in Shanghai Colleges and Universities [egd11008]
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Graphitic carbon nitride (g-C3N4) was synthesized by directly thermal condensation of dicyandiamide and characterized by XRD, XPS, SEM, TEM and FT-IR. Then the as-prepared catalyst was employed to degrade priority pollutant 2,4,6-trichlorophenol (2,4,6-TCP) under visible light irradiation (lambda > 420 nm). The 2,4,6-TCP could be completely mineralized over g-C3N4, and the pseudo-first-order rate constant for 10(-4) M 2,4,6-TCP degradation was 0.70 h(-1) in the presence of 1 g/L catalyst. O-center dot(2)-/(OOH)-O-center dot was identified as the most important reactive species contributing to 2,4,6-TCP degradation in air. Meanwhile, valence band holes (VB holes) of g-C3N4 was observed to play important roles for the degradation of 2,4,6-TCP at N-2 gas ambient when metal ions were added as electron acceptors. The possible degradation pathway of 2,4,6-TCP was proposed. (C) 2012 Elsevier B.V. All rights reserved.
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