| 초록 |
Porous hierarchical structured microspheres of bismuth sulphide (Bi2S3)/bismuth tungstate (Bi2WO6) have shown promising photocatalytic activity by reducing highly toxic and carcinogenic Cr (VI) and citric acid oxidation at the same time, in comparison to various heterostructured photocatalysts. Co-synthesis of the composites Bi2S3/Bi2WO6 were carried out in a ternary solvent medium (ethanol/acetic acid/water), ethyl acetate in water acted as soft template for microspheres. Composites were synthesized on basis of different Bi2S3 content and characterized using different spectroscopic, microscopic and surface area analysis techniques. Photoluminescence spectrometry was used to explain photoexcitation mechanism of composite materials. Oxidation of citric acid increases the reduction of Cr (VI) up till an optimum point, highlighting its role as a hole scavenger. Combined reduction of Cr (VI) and oxidation of citric acid makes this a promising photocatalyst material. |
