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Synergistic photocatalytic properties and mechanism of g-C3N4 coupled with zinc phthalocyanine catalyst under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45216 46407 2016 9 PDF Available
Title
Synergistic photocatalytic properties and mechanism of g-C3N4 coupled with zinc phthalocyanine catalyst under visible light irradiation
Abstract

•Synergistic photocatalytic mechanism to eliminate recalcitrant organic pollutants.•g-C3N4 coupled with ZnPc catalyst exhibits high photoactivity over a wide pH range.•ZnPc greatly promotes the visible light-driven photocatalytic activity of g-C3N4.•Effective method for broadening the spectral response region of photocatalysts.•Provide useful insights to improve the performance of traditional photocatalysts.

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 (1O2), superoxide radical (O2−) and hydroxyl radical (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.

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Keywords
G-C3N4; Zinc phthalocyanine; Visible light; Mechanism; Degradation pathway
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Synergistic photocatalytic properties and mechanism of g-C3N4 coupled with zinc phthalocyanine catalyst under visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 20–28
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us