title: Efficient gaseous toluene photoconversion on graphene-titanium dioxide nanocomposites with dominate exposed {001} facets.
abstract: A series of GnTiO2 {001} nanocomposites (GTN) with dominate exposed {001} facets has been synthesized by various dosage of graphite oxide (GO) and hydrofluoric acid (HF) during a facile solvothermal process successfully. The photocatalytic degradation efficiency (PDE) of the optimal sample reached up to 98.7% for liquids methyl orange and up to 78.6% for gaseous toluene under the UV-light irradiation for 30 min, which is much higher than P25. The effects mechanism of HF and GO on the percentage of {001} facets exposed and the crystal morphology are investigated by XRD, SEM, TEM, UV-Vis, XPS and BET measurement, particularly. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) were used to explore the electron transfer mechanisms of GnTiO2 {001} nanocomposites. These results reveal the enhanced photocatalytic properties attribute to the excellent electron transport of Gn and highly reactive {001} facets can facilitate the separation of photo-generated charge carriers. Moreover, Gn can extend the absorption range of light and improve the adsorptivity of pollutant molecules.
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Shang
authors.affiliation: School of Science Tibet University, Tibet 850000, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Tan
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China. Electronic address: yutao@tju.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Yu
authors.affiliation: School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
authors.forename: Zhiyang
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; College of Science, Civil Aviation University of China, Tianjin 300300, China.
authors.forename: Yunling
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Chinese Research Academy of Environmental Sciences, Beijing 100000, China.
authors.forename: Siyu
authors.initials: S
authors.lastname: Wang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D004579:Electron Transport; D004785:Environmental Pollutants / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006858:Hydrofluoric Acid / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D001391:Azo Compounds; D004785:Environmental Pollutants; D005740:Gases; D010087:Oxides; C009495:titanium dioxide; D014050:Toluene; C100258:methyl orange; D006108:Graphite; D014025:Titanium; D006858:Hydrofluoric Acid
keywords: Gaseous toluene; GnTiO(2) {001} nanocomposites; Graphite oxide; Hydrofluoric acid; Liquids methyl orange; Photoelectrochemistry properties