Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 180, Issue -, Pages 20-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.06.009
Keywords
G-C3N4; Zinc phthalocyanine; Visible light; Mechanism; Degradation pathway
Funding
- National Natural Science Foundation of China [51133006, 51103133]
- Public Welfare Technology Application Research Project of Zhejiang Province [2015C33018]
- Zhejiang Provincial Natural Science Foundation of China [LY14E030013, LY14E030015]
- Textile Vision Science Education Fund
- 521 Talent Project of ZSTU
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Visible light-responsive photocatalysis has shown great potential for effluent treatment as an environmentally friendly method. Herein, the photocatalyst of graphitic carbon nitride (g-C3N4) coupled with zinc phthalocyanine (g-C3N4/ZnTcPc) was prepared by immobilizing zinc tetracarboxyphthalocyanine (ZnTcPc) onto g-C3N4 covalently. The spectral response region of g-C3N4 has been extended from 450 nm to more than 800 nm sensitized by ZnTcPc, which is well known for the red/near-IR (Q band) light absorption. Compared with pure g-C3N4 and ZnTcPc, g-C3N4/ZnTcPc presented a significantly enhanced photocatalytic activity for the degradation of rhodamine B (RhB) and 4-chlorophenol (4-CP) under visible irradiation. The photocatalytic activity of g-C3N4 has been improved by the coupled interaction with ZnTcPc over a wide pH range. Moreover, besides photogenerated hole, the presence of singlet oxygen (O-1(2)), superoxide radical (center dot O-2(-)) and hydroxyl radical (center dot OH) has been evidenced in the visible light-responsive catalytic system with g-C3N4/ZnTcPc, especially in alkaline condition. The possible photocatalytic degradation pathway of RhB has been proposed according to the results of ultra-performance liquid chromatography and high-definition mass spectrometry (UPLC Synapt G2-S HDMS). This synergistic photocatalytic process will provide useful insights to make full use of solar light for future application to eliminate recalcitrant organic pollutants. (C) 2015 Elsevier B.V. All rights reserved.
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