title: Efficient visible-light photocatalytic degradation of sulfadiazine sodium with hierarchical Bi₇O₉I₃under solar irradiation.
abstract: Bi₇O₉I₃, a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi₇O₉I₃. The result of SEM observation shows that the as-synthesized Bi₇O₉I₃ consists of a large number of micro-sheets with parallel rectangle structure. The optical test exhibited strong photoabsorption in visible light irradiation, with 617 nm of absorption edges. Moreover, the difference in the photocatalytic efficiency of as-prepared Bi₇O₉I₃ at different seasons of a whole year was investigated in this study. The chemical oxygen demand removal efficiency and concentration of NO(3)(-) and SO(4)(2-) of solution after reaction were also researched to confirm whether degradation of the pollutant was complete; the results indicated a high mineralization capacity of Bi₇O₉I₃. The as-synthesized Bi₇O₉I₃exhibits an excellent oxidizing capacity of sulfadiazine sodium and favorable stability during the photocatalytic reaction.
authors.affiliation: Institution of Chemistry and Molecular Engineering, Zhengzhou University, China E-mail: xumengmeng951@163.com.
authors.forename: MengMeng
authors.initials: M
authors.lastname: Xu
authors.affiliation: Institution of Chemistry and Molecular Engineering, Zhengzhou University, China E-mail: xumengmeng951@163.com.
authors.forename: YaLei
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Institution of Chemistry and Molecular Engineering, Zhengzhou University, China E-mail: xumengmeng951@163.com.
authors.forename: QiShe
authors.initials: Q
authors.lastname: Yan
mesh_terms: D000327:Adsorption; D001729:Bismuth / Q000737:chemistry / Q000378:metabolism*; D002384:Catalysis; D003460:Crystallization; D007454:Iodides / Q000737:chemistry / Q000378:metabolism*; D017613:Iodine Compounds / Q000378:metabolism*; D008027:Light; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D056951:Photoelectron Spectroscopy; D012993:Solar Energy; D013056:Spectrophotometry, Ultraviolet; D013411:Sulfadiazine / Q000737:chemistry / Q000378:metabolism* / Q000528:radiation effects; D014961:X-Ray Diffraction
chemical_list: D001729:Bismuth; D007454:Iodides; D017613:Iodine Compounds; D010087:Oxides; D010100:Oxygen; D013411:Sulfadiazine; C000605741:Bi₇O₉I₃