Synthesis and Photocatalytic Activity of Cr Doped TiO2 Nanowires/Reduced Graphene Oxide Composites†

doi:10.7503/cjcu20160323

Abstract

Abstract:

Cr-doped TiO₂ nanowires/reduced graphene oxide composites(Cr-TiO₂NWs/RGO) were synthesized via alkaline hydrothermal method, in which commercial TiO₂ nanoparticles(P25) and graphene oxide(GO) were used as the precursors while Cr(NO₃)₃·9H₂O was used as the Cr source. Other samples, such as TiO₂ nanowires(TiO₂NWs), were prepared via the similar method. The obtained samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The photocatalytic activities of the samples were evaluated by measuring the photodegradation of methylene blue(MB) under visible light irradiation. The results showed that the degradation rate of MB catalyzed by Cr-TiO₂NWs/RGO was 2.2 times that catalyzed by TiO₂NWs within 120 min, and the degradation speed of MB catalyzed by Cr-TiO₂NWs/RGO is 5.8 times that catalyzed by TiO₂NWs.

Key words: Cr doped TiO2, Graphene composite, Photocatalysis, Hydrothermal method

CLC Number:

O643.3

TrendMD:

ZHU Jielian, XIA Xiaofeng, ZHU Shanshan, LIU Xiang, LI Hexing. Synthesis and Photocatalytic Activity of Cr Doped TiO₂Nanowires/Reduced Graphene Oxide Composites^†[J]. Chem. J. Chinese Universities, 2016, 37(10): 1833.

Figures/Tables 8

Fig.1 XRD patterns of TiO2NWs(a), Cr-TiO2NWs(b),TiO2NWs/RGO(c), Cr-TiO2NWs/RGO(d) and GO(e)

Fig.2 FTIR spectra of GO(a) and Cr-TiO2NWs/RGO(b)

Fig.3 Raman spectra of TiO2NWs(a), Cr-TiO2NWs(b), TiO2NWs/RGO(c), Cr-TiO2NWs/RGO(d) and GO(e)

Fig.4 Full XPS spectra of GO(A) and Cr-TiO2NWs/RGO(B), Cr XPS spectra of Cr-TiO2NWs/RGO(C), C1sXPS spectra of GO(D) and Cr-TiO2NWs/RGO(E), O1sXPS spectra of GO and Cr-TiO2NWs/RGO(F)

Fig.5 SEM(A, B) and TEM(C, D) images of Cr-TiO2NWs/RGO

Fig.6 UV-Vis DRS(A) and corresponding Tauc’s plots(B) of different photocatalystsa. TiO2NWs; b. Cr-TiO2NWs; c. TiO2NWs/RGO; d. Cr-TiO2NWs/RGO.

Fig.7 Adsorbing capacity(A), photodecomposition curves(B) and relationship between irradiation time and ln(c0/c)(C) of different catalysts for MBa. No catalysts; b. TiO2NWs; c. Cr-TiO2NWs; d. TiO2NWs/RGO; e. Cr-TiO2NWs/RGO.

Fig.8 Schematic illustration of photocatalytic enhancement mechanism of Cr-TiO2NWs/RGO

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Synthesis and Photocatalytic Activity of Cr Doped TiO₂Nanowires/Reduced Graphene Oxide Composites^†

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