title: Enhanced UV-visible response of bismuth subcarbonate nanowires for degradation of xanthate and photocatalytic reaction mechanism.
abstract: (BiO)2CO3 nanowires were prepared by simple hydrothermal treatment of commercial Bi2O3 powders and characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of (BiO)2CO3 nanowires was studied through degradation of sodium isopropyl xanthate. Photocatalytic experimental results indicated that the as-prepared (BiO)2CO3 nanowires show high photocatalytic efficiency. Photocatalytic activity increased after two cycles. Time-dependent UV-vis spectra demonstrated that the final degradation products included isopropyl alcohol and carbon disulfide. UV-vis diffuse reflection spectra showed that the band gap of the as-prepared (BiO)2CO3 nanowires and recycled (BiO)2CO3 nanowires were 2.75 eV and 1.15 eV, respectively. XPS results indicated that formation of Bi2S3@(BiO)2CO3 core-shell nanowires occurred after recycled photodegradation of isopropyl xanthate owing to existence of two types of Bi configurations in the recycled (BiO)2CO3 nanowires. A probable degradation mechanism of isopropyl xanthate was also proposed.
authors: Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
authors: Kuixin
authors: K
authors: Cui
authors: Powder Metallurgy Research Institute, Central South University, Changsha 410083, China.
authors: Yuehui
authors: Y
authors: He
authors: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Key Laboratory for Mineral Materials and Application of Hunan Province, Central South University, Changsha 410083, China. Electronic address: shmjin@csu.edu.cn.
authors: Shengming
authors: S
authors: Jin
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D002254:Carbonates; D002384:Catalysis; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053770:Nanowires; D056951:Photoelectron Spectroscopy; D010782:Photolysis
chemical_list: D002254:Carbonates; C028508:bismuth subcarbonate; D001729:Bismuth
keywords: Bismuth carbonate nanowires; Core–shell nanowires; Photocatalytic degradation; Xanthate pollutant