Simple tactic polycondensation synthesis of Z-scheme Quasi-Polymeric g-C3N4/CaFe2O4 composite for enhanced photocatalytic water depollution via p-n heterojunction
Simple tactic polycondensation synthesis of Z-scheme Quasi-Polymeric g-C3N4/CaFe2O4 composite for enhanced photocatalytic water depollution via p-n heterojunction
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DOI：
10.1016/j.cej.2022.139758
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发表时间：
2022-10
影响因子：
15.1
通讯作者：
Sulakshana Shenoy;Chitiphon Chuaicham;T. Okumura;S. Karthikeyan;K. Sasaki
中科院分区：
文献类型：
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作者：
Sulakshana Shenoy;Chitiphon Chuaicham;T. Okumura;S. Karthikeyan;K. Sasaki
铁氧体是有前途的光催化剂，因为它们吸收相当一部分可见光。在此，采用一种新颖的原位简单立构缩聚方法在 p 型 CaFe2O4 颗粒上生产型多孔石墨氮化碳纳米片，从而形成“准聚合物”异质结。创建了界面电子陷阱状态，如 g-C3N4/CaFe2O4 中电子陷阱图案的能量分辨分布所示，它捕获激发的电子并防止电荷载流子复合。当 g-C3N4/CaFe2O4 复合材料中 CaFe2O4 前体含量优化时，环丙沙星和苯酚的降解率分别是原始 g-C3N4 的 2.3 和 2.1 倍。 g-C3N4/CaFe2O4复合材料有效吸收可见光，并可以通过p-n异质结分离和传输电荷载流子。使用光致发光光谱和光电化学表征验证了复合材料中实现的有效界面电荷传输和分离。根据清除剂研究和电子自旋共振分析，上述污染物降解最活跃的自由基种类是空穴和超氧阴离子自由基。 Mott-Schottky 测量和 X 射线光电子能谱证实了光催化反应机理是基于 p-n 异质结的 Z 型载流子传输路径。因此，g-C3N4/CaFe2O4异质结为高效且长期的污染物降解提供了广阔的前景。
Ferrites are promising photocatalysts as they absorb a considerable fraction of visible light. Herein, a novelin-situsimple tactic polycondensation method was used to producen-type porous graphitic carbon nitride nanosheets over p-type CaFe2O4particles resulting in a “quasi-polymeric” heterojunction. An interfacial electron trap state was created, as represented by an energy-resolved distribution of electron trap patterns in the g-C3N4/CaFe2O4, which traps excited electrons and prevents charge carrier recombination. When the CaFe2O4precursor content in the g-C3N4/CaFe2O4composite was optimized, the degradation rates of ciprofloxacin and phenol are 2.3 and 2.1-fold higher in comparison to pristine g-C3N4, respectively. The g-C3N4/CaFe2O4composite efficiently absorbed visible light and could separate and transport charge carriers through the p-n heterojunction. The efficient interfacial charge transport and separation achieved in the composite were validated using photoluminescence spectra and photoelectrochemical characterizations. Based on scavenger studies and electron spin resonance analysis, the most active radical species for the aforementioned pollutant degradation are holes and superoxide anion radicals. Mott-Schottky measurements and X-ray photoelectron spectroscopy confirmed the photocatalytic reaction mechanism is a Z-scheme charge carrier transport route based on the p-n heterojunction. Therefore, the g-C3N4/CaFe2O4heterojunction offers a lot of promise for pollutant degradation that is both efficient and long-term.