Synergistic photocatalytic properties and mechanism of g-C3N4 coupled with zinc phthalocyanine catalyst under visible light irradiation
Synergistic photocatalytic properties and mechanism of g-C3N4 coupled with zinc phthalocyanine catalyst under visible light irradiation
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可见光照射下g-C3N4与锌酞菁催化剂的协同光催化性能及机理
DOI：
10.1016/j.apcatb.2015.06.009
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发表时间：
2016-01-01
影响因子：
22.1
通讯作者：
Chen, Wenxing
中科院分区：
文献类型：
--
作者：
Lu, Wangyang;Xu, Tiefeng;Chen, Wenxing
作为一种环境友好的方法，可见光响应光催化在污水处理方面显示出巨大的潜力。通过将四羧基酞菁锌（ZnTcPc）共价固定在g-C3N4上，制备了石墨氮化碳(g-C3N4) -酞菁锌（g-C3N4/ZnTcPc）光催化剂。ZnTcPc敏化了g-C3N4的光谱响应区域，从450 nm扩展到800 nm以上，具有红/近红外（Q波段）光吸收。与纯g-C3N4和ZnTcPc相比，g-C3N4/ZnTcPc在可见光下对罗丹明B （RhB）和4-氯酚（4-CP）的光催化降解活性显著增强。通过与ZnTcPc的耦合作用，g-C3N4在较宽的pH范围内提高了光催化活性。此外，在g-C3N4/ZnTcPc的可见光响应催化体系中，除了光生空穴外，还存在单线态氧（O-1(2)）、超氧自由基（中心点O-2(-)）和羟基自由基（中心点OH），特别是在碱性条件下。根据超高效液相色谱和高清晰度质谱分析（UPLC Synapt G2-S HDMS）的结果，提出了RhB可能的光催化降解途径。这一协同光催化过程将为充分利用太阳能消除顽固性有机污染物提供有益的见解。(C) 2015 Elsevier B.V.版权所有
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.