title: Electrochemical anodization of graphite oxide-TiO2nanotube composite for enhanced visible light photocatalytic activity.
abstract: The electrochemical anodization method was used to dope graphite oxide (GO) onto TiO2nanotubes (TNTs). This study focused on enhancement of the photocatalytic activity of TNTs in the visible light region. In this study, we have checked the effect of different GO concentrations and effect of GO doping time on photocatalytic efficiency of composite. The photocatalytic activity of the GO-TNT composite was tested by degradation of an organic compound. The organic compound was most severely degraded (95%) when the GO-TNT catalyst was doped at an anodization of 60 V for 13 min and GO concentration of 0.25 g L-1. This degradation was 5.6 times higher than that of bare TiO2. The as-prepared catalyst was characterized using FE-SEM, XRD, AES, PL, UV-Vis DRS, and Raman analysis. Recycling of the GO-TNT composite was also performed in order to examine the stability of the visible light catalyst. We observed that the doping of GO on the TNT surface can enhance the photocatalytic efficiency under visible light. Graphene acts as an electron transport; therefore, GO-TNTs were favorable for the separation of e-and h+charges. This promoted the formation of OH radicals, h+, and superoxides, all of which degrade organics.
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
authors.forename: Imran
authors.initials: I
authors.lastname: Ali
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
authors.forename: Kyungmin
authors.initials: K
authors.lastname: Park
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
authors.forename: Seu-Run
authors.initials: SR
authors.lastname: Kim
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea. jk120@hanyang.ac.kr.
authors.forename: Jong-Oh
authors.initials: JO
authors.lastname: Kim
mesh_terms: D002384:Catalysis; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry; D008027:Light; D008751:Methylene Blue / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman; D013481:Superoxides / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D014874:Water Pollutants, Chemical; D013481:Superoxides; C009495:titanium dioxide; D006108:Graphite; D014025:Titanium; D008751:Methylene Blue
keywords: Anodization; Graphite oxide; Organic degradation; Photocatalyst; TiO2 nanotubes; Visible light