title: Novel approach to enhance photosensitized degradation of rhodamine B under visible light irradiation by the ZnxCd1-xS/TiO2 nanocomposites.
abstract: In order to exploit efficient photosensitizers with appropriate electronic states to enhance the transfer of electrons, ZnxCd1-xS/TiO2 nanocomposites were first synthesized by a simple hydrothermal method. The samples were characterized by X-ray diffraction, transmission electron microscopy, diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, electron spin resonance, and photoluminescence techniques. The results showed that the composite of the two inorganic semiconductors largely enhanced the photosensitized degradation of rhodamine B (RhB) under visible light irradiation (420 nm<λ<800 nm). These photocatalytic reactions were driven mainly by the light absorption of RhB molecules and to a lesser extent by the excitation of ZnxCd1-xS. They were supposed to arise mainly from the electron transferred from the adsorbed dye in its singlet excited state to the conduction band of ZnxCd1-xS and TiO2. Such a heterogeneous photocatalytic reaction has much significance in the degradation of organic pollutants in ordinary photocatalysis.
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, PR China.
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Li
authors.forename: Danzhen
authors.initials: D
authors.lastname: Li
authors.forename: Sugang
authors.initials: S
authors.lastname: Meng
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Xianzhi
authors.initials: X
authors.lastname: Fu
authors.forename: Yu
authors.initials: Y
authors.lastname: Shao
mesh_terms: D002104:Cadmium / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007202:Indicators and Reagents / Q000737:chemistry*; D008027:Light; D053761:Nanocomposites / Q000737:chemistry*; D055668:Photochemical Processes; D012235:Rhodamines / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D007202:Indicators and Reagents; D012235:Rhodamines; D002104:Cadmium; C009495:titanium dioxide; D014025:Titanium; D015032:Zinc; C029773:rhodamine B