title: Coupling with a narrow-band-gap semiconductor for the enhancement of visible-light photocatalytic activity: preparation of Bi2OxS3-x/Nb6O17 and application to the degradation of methyl orange.
abstract: A series of 2D sheet Bi2OxS3-x/Nb6O17 (Bi/Nb) heterostructure photocatalysts were synthesized through a facile hydrothermal vulcanization method between Bi(3+) exchanged K4Nb6O17 and thiourea (NH2CSNH2). XRD results confirm that the heterostructures were composed of Bi2OxS3-x and Nb6O17. HRTEM indicates that Bi2OxS3-x was successfully intercalated into layers of K4Nb6O17. Such large interfacial contacts can be beneficial to the transfer and separation of photogenerated charge carriers. Thus the composites exhibit good photocatalytic performance for the degradation of methyl orange (MO) under visible light irradiation (λ > 400 nm), which is superior to that of both precursors, pure Bi2S3 and K4Nb6O17. Radical capture tests reveal that photogenerated holes h(+) and ˙O2(-) play important roles in the photodegradation of MO. And based on the UV-visible diffuse reflectance spectra (DRS) and the band gap of the semiconductors, the mechanism of the enhanced visible light photocatalytic activity of these composites has been proposed.
authors.affiliation: Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Ren Min Street No. 5268, Changchun, Jilin 130024, People's Republic of China. tanhq870@126.com wangyh319@nenu.edu.cn liyg658@nenu.edu.cn.
authors.forename: Gang
authors.initials: G
authors.lastname: Yan
authors.forename: Hongfei
authors.initials: H
authors.lastname: Shi
authors.forename: Huaqiao
authors.initials: H
authors.lastname: Tan
authors.forename: Wanbin
authors.initials: W
authors.lastname: Zhu
authors.forename: Yonghui
authors.initials: Y
authors.lastname: Wang
authors.forename: Hongying
authors.initials: H
authors.lastname: Zang
authors.forename: Yangguang
authors.initials: Y
authors.lastname: Li