Photocatalytic Properties Of Visible-light Response Heterojunction Nanocomposites Prepared By Electrospinning

With the increasing environmental problems and energy crisis,semiconductor photocatalytic technology has become more and more important.Among numerous semiconductor systems,heterojunction,consisting of two visible-ight response of semiconductor,can not only absorb large range of visible light,but also promote the electron-hole separation and inhibit recombination.The heterojunction shows higher photocatalytic activity than the single catalyst,and is considerd as an effective way to increase quantum efficiency.This paper aims to prepare hexagonal-YFeO₃/a-Fe₂O₃ nanowires and a-Fe₂O₃/Ag₃PO₄ composites by electrospinning,and the role of heterojunction in the separation of electron-hole is studied.In this paper,hexagonal?h?and orthorhombic?o?YFeO₃ were prapared by electrospinning and calcination.Compared with o-YFeO₃,h-YFeO₃ possesses smaller size and higher photocatalytic activity in degradation of RhB.a-Fe₂O₃ nanotubes and irregular a-Fe₂O₃ nanowires were prepared throug calcination at 550 ? and 700 ?,respectively.The photodegradation of RhB and watersplitting tests real that the sample calcinated at 550 ? exibits better photacatalytic activity.h-YFeO₃/a-Fe₂O₃ heterojunction nanowires were prepared by electrospinning and calcination.The molar ratios of h-YFeO₃ and a-Fe₂O₃ were controled by adjusting atom ratios of Fe and Y in precursor.Compared with pure h-YFe O3 and a-Fe₂O₃,h-YFeO₃/a-Fe₂O₃ heterojunction exibits enhanced photocurrent density and photocatalytic activity.When the molar ratio of h-YFeO₃ and a-Fe₂O₃ is 1:1,the heterojunction shows highest activity.a-Fe₂O₃/Ag₃PO₄ heterojunctions were fabricated using electrospinning and ion exchange method.The water splitting results show that the formation of the heterojunction can effectively promote electron-hole separation improve the photocatalytic activity.