Pan Xiangping, Meng Ying, Liu Qingwang, Xu Mai
Anhui Engineering Research Center for Photoelectrocatalytic Electrode Materials, School of Chemistry and Material Engineering, Huainan Normal University, Huainan 232038, China.
Molecules. 2024 Aug 9;29(16):3774. doi: 10.3390/molecules29163774.
AgPO/g-CN photocatalytic composites were synthesized via calcination and hydrothermal synthesis for the degradation of rhodamine B (RhB) in wastewater, and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The degradation of RhB by AgPO/g-CN composites was investigated to evaluate their photocatalytic performance and cyclic degradation stability. The experimental results showed that the composites demonstrated notable photocatalytic activity and stability during degradation. Their high degradation efficiency is attributed to the Z-scheme transfer mechanism, in which the electrons in the AgPO conduction band and the holes in the g-CN valence band are annihilated by heterojunction recombination, which greatly limits the recombination of photogenerated electrons and holes in the catalyst and enhances the activity of the composite photocatalyst. In addition, measurements of photocurrent (PC) and electrochemical impedance spectroscopy (EIS) confirmed that the efficient charge separation of photo-generated charges stemmed from strong interactions at the close contact interface. Finally, the mechanism for catalytic enhancement in the composite photocatalysts was proposed based on hole and radical trapping experiments, electron paramagnetic resonance (EPR) analysis, and work function evaluation.
通过煅烧和水热合成法制备了AgPO/g-CN光催化复合材料，用于降解废水中的罗丹明B（RhB），并采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和漫反射光谱（DRS）对其进行了表征。研究了AgPO/g-CN复合材料对RhB的降解情况，以评估其光催化性能和循环降解稳定性。实验结果表明，该复合材料在降解过程中表现出显著的光催化活性和稳定性。其高降解效率归因于Z型转移机制，即AgPO导带中的电子与g-CN价带中的空穴通过异质结复合而湮灭，这极大地限制了催化剂中光生电子和空穴的复合，提高了复合光催化剂的活性。此外，光电流（PC）测量和电化学阻抗谱（EIS）证实，光生电荷的有效分离源于紧密接触界面处的强相互作用。最后，基于空穴和自由基捕获实验、电子顺磁共振（EPR）分析和功函数评估，提出了复合光催化剂中催化增强的机制。
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