Fabricaion of improved novel p–n junction BiOI/Bi2Sn2O7 nanocomposite for visible light driven photocatalysis. (December 2015)

• Record Type: Journal Article
• Authors: Xu, Weicheng; Fang, Jianzhang; Zhu, Ximiao; Fang, Zhanqiang; Cen, Chaoping
• Is Part Of: Materials research bulletin. Volume 72(2016)
• Page Start: 229
• Page End: 234
• Publication Date: 2015-12
• Subjects: Nanostructures -- Oxides -- Semiconductors -- Catalytic properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.07.033
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: A p–n heterojunction photocatalyst BiOI/Bi2 Sn2 O7 was prepared by hydrothermal method. 4% BiOI/Bi2 Sn2 O7 with maximal photocatalytic degradation efficiency (RhB) of 99.9%. A specific degradation routes of RhB was illustrated. The photocatalytic mechanism is discussed according to p–n junction principles. O2 − and h+ are the main reactive species for the degradation of RhB. Abstract: A series of novel p−n junction photocatalysts BiOI/Bi2 Sn2 O7 (BiOI/BSO) were successfully fabricated via a facile hydrothermal method. The phase structures, morphologies and optical properties of the as-prepared samples were studied by XRD, TEM, HRTEM, BET, XPS, UV–vis DRS and photoluminescence (PL) spectroscopy. The results showed that BiOI/BSO heteronanostructures displayed much higher photocatalytic activity than pure BSO and BiOI for the degradation of rhodamine B (RhB). The best photocatalytic activity of BiOI/BSO with almost 99.9% RhB degradation situated at molar percentage ratio of 4% after 6 h irradiation. The enhanced photocatalytic performance of BiOI/BSO could be mainly attributed to the formation of the heterojunction between p-BiOI and n-BSO, which effectively restrains the recombination of photoinduced electron–hole pairs. Moreover, the study of radical scavengers affirmed that h + and O2 − were the primary reactive species for the degradation of RhB.