Bi2S3和Ag/Bi2S3的制备及其光催化还原六价铬性质研究

PREPARATION AND PHOTOCATALYTIC PROPERTIES OF Bi2S3 AND Ag/Bi2S3 COMPOSITES FOR REDUCTION OF Cr(VI)

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。

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 AgNO 3 in 60℃water bath using the cruciform bismuth sulfide sample with larger specific surface area as the substrate.Compared with the pure Bi2S 3,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.