【摘要】 在150℃水热条件下制备了不同形貌的Bi₂S₃,测试了不同形貌Bi₂S₃的光催化还原六价铬性能,结果表明,纯Bi₂S₃对六价铬的还原效率不理想。由于金属银具有SPR效应、好的吸光性能和优良的电子存储性能,选用价格相对低廉的贵金属银对纯Bi₂S₃进行复合改性。选取比表面积较大的十字花形硫化铋样品作为底物,在60℃水浴条件下,通过还原AgNO₃制备了Ag/Bi₂S₃复合物。与纯Bi₂S₃相比,Ag/Bi₂S₃复合物还原六价铬的性能有了显著的提高,主要归因于复合物增强了光吸收,有效地提高了光生电子空穴对的分离率和电子的传输能力。此外,对于复合物高效还原Cr（Ⅵ）的可能机理进行了详细的阐述。更多还原

【Abstract】 Bi₂S₃ with different morphologies was prepared under the hydrothermal condition of 150 ℃,and their photocatalytic behavior of reduction hexavalent chromium was tested. The results show that the reduction efficiency of pure Bi₂S₃ to hexavalent chromium is not ideal under simulating sunlight. Because the metal silver has SPR effect,good light absorption and excellent electron reservoir,the pure Bi₂S₃ was modified by the metal silver. The Ag/Bi₂S₃ composite was prepared by reducing AgNO₃ in 60 ℃ water bath using the cruciform bismuth sulfide sample with larger specific surface area as the substrate. Compared with the pure Bi₂S₃,the photocatalytic performance of Ag/Bi₂S₃ composite in reducing hexavalent chromium has significantly improved,which may be related to strong visible light absorption,high separation rate of electron-hole pairs and fast electronic transmission. The possible mechanism of high efficient reduction Cr（Ⅵ） of the composite photocatalyst has been described in detail.更多还原