AgCl/Bi25FeO40复合材料制备及光催化性能

采用水热-超声化学法制得负载不同质量分数AgCl的AgCl/Bi₂₅FeO₄₀复合材料，通过XRD，SEM-EDS，UV-Vis DRS和PL光谱等表征手段对复合材料的微观形貌、晶相组成、光吸收性能等进行了表征，并进行了光催化降解罗丹明B实验.结果表明，Bi₂₅FeO₄₀呈正立方体结构，直径0.8~10μm，AgCl直径90~130nm，均匀负载在Bi₂₅FeO₄₀上.二者的复合扩宽了光响应范围，提高了Bi₂₅FeO₄₀光催化活性.投加0.1 g AgCl /Bi₂₅FeO₄₀降解100mL质量浓度为15mg/L罗丹明B溶液，当负载的AgCl质量分数为51.48%时，降解效果最佳，75min降解率达到94.4%，90min可以完全降解罗丹明B.此外，对AgCl/Bi₂₅FeO₄₀的降解机理进行了分析，认为h⁺，e^-，H₂O₂，·O^-₂为该光催化体系主要的活性基团，起到降解罗丹明B的作用.

Preparation and Photocatalytic Properties of AgCl/Bi25 FeO40 Composites

AgCl/Bi₂₅FeO₄₀ composites loaded with different mass fractions of AgCl were prepared by the hydrothermal-sonochemical method. The microstructure， crystal phase composition and optical absorption properties of the composites were characterized by XRD， SEM-EDS， UV-Vis DRS and PL spectra. The photocatalytic degradation of Rhodamine B was also carried out. The results showed that Bi₂₅FeO₄₀was a cubic structure with a diameter of 0.8~10μm. AgCl was uniformly loaded on Bi₂₅FeO₄₀ with a diameter of 90~130nm. The combination of the two materials broadens the photo response range of the single material and improves the photocatalytic activity of Bi₂₅FeO₄₀. 0.1g AgCl/Bi₂₅FeO₄₀ was added to degrade 100mL 15mg/L Rhodamine B solution， when the mass fraction of loaded AgCl was 51.8 %， the degradation rate reached 94.4% in 75 min and Rhodamine B could be completely degraded in 90min. In addition， the degradation mechanism of AgCl /Bi₂₅FeO₄₀ was analyzed. It was considered that h⁺， e^-，H₂O₂ and ·O^-₂ are the main active groups of the photocatalysis system to degrade Rhodamine B.