Preparation And Photocatalytic Performance Of Bismuth-based Oxysalts/New Carbon Material Composite Photocatalyst

In the past decade,visible photocatalysis have drawn great attention owing to their outstanding performance in degradation of organic pollutants,hydrogen production from water and energy conversion.Many metal oxide compounds containing bismuth as photocatalysts were extensively investigated because of their unique band structures,including BiVO₄,Bi₂WO₆,Bi₂MoO₆,etc.The valence band?VB?is hybridized by Bi 6s and O 2p level,it would greatly contribute to the band gap narrowing and visible-light absorption of Bi-based oxides.g-C₃N₄ has received significant attention and well studied because of its robust surface chemistry,significant recyclability,nontoxicity and low cost.However,the photocatalytic activity of single photocatalyst is restricted due to the higher recombination rate of the photogenerated carriers.Therefore,it is meaningful to design composite photocatalyst with higher photocatalytic activity.A series of g-C₃N₄/BiNbO₄ and g-C₃N₄/Bi₂WO₆ composite photocatalysts with various compositions were synthesized through and the photocatalytic activities under visible light were also investigated.The prepared composites were characterized by XRD,FT-IR,XPS,FE-SEM,EDS,B.E.T.surface area analysis,UV-vis-DRS and PL.The photocatalytic ability of the novel photocatalyst was investigated through the degradation of rhodamine B?RhB?under visible light irradiation.Experimental results showed that g-C₃N₄/BiNbO₄ displayed excellent photocatalytic activity.Enhanced photocatalytic activity of composite material was attributed to the formation of the heterojunction between g-C₃N₄ and BiNbO₄,which greatly reduces the recombination rate of photogenerated charge carriers.Compared with pure Bi₂WO₆ and g-C₃N₄,the g-C₃N₄/Bi₂WO₆ displayed a significant enhanced photocatalytic activity.And after the four recycling run,the photocatalytic activity of g-C₃N₄/Bi₂WO₆ is still remained prossess good photocatalytic performance.The experimental results indicating that the g-C₃N₄/Bi₂WO₆photocatalyst prossess excellent photocatalytic activity and great stability.