title: Controlled synthesis of olive-shaped Bi2S3/BiVO4 microspheres through a limited chemical conversion route and enhanced visible-light-responding photocatalytic activity.
abstract: Well-defined olive-shaped Bi(2)S(3)/BiVO(4) microspheres were synthesized through a limited chemical conversion route (LCCR), where olive-shaped BiVO(4) microspheres and thioacetamide (TAA) were used as precursors and sulfur source, respectively. The as-synthesized products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission microscope (HRTEM), X-ray photoelectron spectra (XPS), UV-visible diffuse-reflectance spectroscopy (UV-vis DRS), and photoluminescence (PL) spectra in detail. Compared with pure BiVO(4) microspheres and Bi(2)S(3) nanorods, the Bi(2)S(3)/BiVO(4) products showed obviously enhanced photocatalytic activity for the degradation of rhodamine B (Rh B) in aqueous solution under visible-light irradiation (λ > 400 nm). In addition, the Bi(2)S(3)/BiVO(4) composite microspheres showed good visible-light-driven photocatalytic activity for the degradation of refractory oxytetracycline (OTC) as well. On the basis of UV-vis DRS, the calculated energy band positions, and PL spectra, the mechanism of enhanced photocatalytic activity of Bi(2)S(3)/BiVO(4) was proposed. The present study provides a new strategy to design composite materials with enhanced photocatalytic performance.
authors.affiliation: Nanomaterials and Chemistry Key Laboratory, Wenzhou University, Wenzhou, Zhejiang, P R China. dkma@wzu.edu.cn
authors.forename: De-Kun
authors.initials: DK
authors.lastname: Ma
authors.forename: Mei-Li
authors.initials: ML
authors.lastname: Guan
authors.forename: Sen-Sen
authors.initials: SS
authors.lastname: Liu
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Zhang
authors.forename: Chang-Wei
authors.initials: CW
authors.lastname: Zhang
authors.forename: Yu-Xiang
authors.initials: YX
authors.lastname: He
authors.forename: Shao-Ming
authors.initials: SM
authors.lastname: Huang