Construction of P-C3N4/C3N5 isotypic heterojunction for effective degradation of organic pollutants

罗丹明B 异质结 材料科学 光致发光 光催化 X射线光电子能谱 载流子 石墨氮化碳 光电流 光电子学 化学 化学工程 催化作用 生物化学 工程类
作者
Yaodan Cao,Yina Guan,Yanqiu Zhang,Tingting Zhao,Wenqi Ding,Wanting Hui,Jie Wu
出处
期刊:Journal of The Taiwan Institute of Chemical Engineers [Elsevier BV]
卷期号:150: 105019-105019 被引量:8
标识
DOI:10.1016/j.jtice.2023.105019
摘要

Photocatalysis was an effective method for organic pollutant degradation, and graphitic carbon nitride g-C3N4 and g-C3N5 were famous two-dimensional semiconductors. Compared to the allotypic heterojunction, the band alignment and compatibility of isotypic heterojunction were superior. In this work, an organic isotypic heterojunction was constructed via coupling phosphorus-doped C3N4 (P-C3N4) and g-C3N5. The characteristics were evaluated using transmission electron microscope, Fourier transform infrared, X-ray diffractometer, X-ray photoelectron spectrum, ultraviolet-visible (UV–vis) diffuse reflection spectrum, electronic spin resonance (ESR) analysis, photoluminescence spectrometer, electrochemical impedance spectroscopy, and photocurrent analysis. Isotypic heterojunction displayed high UV–vis light harvest, high separation efficiency of photo-induced charge carriers, and low surface resistance. Additionally, an internal-electric-field was established at the interface, which was beneficial for spatial separation of photo-induced charge carriers. As expected, the Rhodamine B (RhB) degradation efficiency was 7.3 and 12.3 times higher than that of the P-C3N4 and g-C3N5. Radical trapping experiment and ESR analysis indicated that •O2−, •OH, hole, 1O2, and electron played joint role in RhB degradation. In this work, a photocatalyst with excellent photocatalytic degradation properties was designed, and it provided a simple and novel strategy for environmental remediation.
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