Graphene facilitated visible light photodegradation of methylene blue over titanium dioxide photocatalysts

Shizhen Liu, Hongqi Sun, Shaomin Liu, Shaobin Wang

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184 Citations (Scopus)

Abstract

Several graphene-titania composites (G-TiO2) were synthesized by a sol-gel method using titanium isopropoxide (or P25) as Ti-precursors and reduced graphene oxide (RGO). The structural, morphological, and physicochemical properties of the samples were thoroughly investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), UV-vis diffuse reflectance (UV-vis DRS), and thermogravimetric-differential thermal analysis (TG-DTA). A significant increase in light absorption to visible light was observed by G-TiO2 compared with that of naked TiO2. The photocatalytic activity of G-TiO2 in methylene blue bleaching under visible light (>430nm) is much enhanced. G-TiO2 synthesized from titanium isopropoxide hydrolysis presented higher activity than that of G-TiO2(P25). Contribution of graphene on the enhancement of visible-light photocatalytic activity of the composite was discussed.

Original languageEnglish
Pages (from-to)298-303
Number of pages6
JournalChemical Engineering Journal
Volume214
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

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