Synthesis of Graphene/Ni/TiO2/CNTs Composites and Photocatalytic Activities

doi:10.15541/jim20130680

Abstract

Abstract:

TiO₂ nanoparticals doped with nickel were coated on graphene by solvo-thermal method. Then the CNTs were grown by in-situ chemical vapor deposition using nickel as catalyst. Finally, the graphene/Ni/TiO₂/CNTs nanocomposites was obtained. The prepared graphene/Ni/TiO₂/CNTsnanocomposite photocatalyst was characterized by X-ray diffraction, field emission scanning electron microscope, transmission electron microscope and Raman spectra. The photocatalytic activities of the samples were investigated by the photocatalytic degradation of methyl orange under UV and visible light. The results indicated that the photocatalytic activities increased from Ni/TiO₂, graphene/Ni/TiO₂, to graphene/Ni/TiO₂/CNTs by the addition of graphene and CNTs. And the photocatalytic activities of graphene/Ni/TiO₂/CNTs increased with the graphene amount increase. For the sample graphene/ Ni/TiO₂/CNTs with the highest graphene content, its photocatalytic degradation of MO under UV irradiation reached 98%, and its photocatalytic degradation of MO under visible light irradiation was 3.5 fold higher than that of sample Ni/TiO₂.

Key words: graphene, CNTs, TiO2, photocatalysis

CLC Number:

TB383

LV Hui, CHEN Ai-Ping, SUN Xiu-Li, TANG Jun, LI Chun-Zhong. Synthesis of Graphene/Ni/TiO₂/CNTs Composites and Photocatalytic Activities[J]. Journal of Inorganic Materials, 2014, 29(10): 1061-1066.

Figures/Tables 7

Fig. 1 XRD patterns of GO, graphene/Ni/TiO2, graphene/Ni/ TiO2/CNTs, Ni/TiO2 and Ni/TiO2/CNTs

Fig. 2 FESEM images of graphene lamella loaded with TiO2 (a) and TiO2 nanoparticles on the graphene (b)

Fig. 3 SEM images of the different graphene/Ni/TiO2/CNTs samples (a) Ni/TiO2/CNTs; (b) 2.2GTC; (c) 11GTC; (d) 55GTC

Fig. 4 TEM images of (a) graphene, (b) Ni/TiO2, (c) graphene/Ni/TiO2 and (d, e) graphene/Ni/TiO2/CNTs

Fig. 5 Raman spectra of the graphene/Ni/TiO2 samples before and after in-situ growing CNTs by CVD (1) 55-GT; (2) 55-GTC; (3) 11-GTC; (4) 2.2-GTC; (5) 11-GT; (6) 2.2-GT; (7) NT; (8) GO; (9) NTC

Fig. 6 UV-Vis absorption spectra of TiO2, graphene/Ni/TiO2, graphene/Ni/TiO2/CNTs, Ni/TiO2 and Ni/TiO2/CNTs

Fig. 7 Photocatalytic degradation of different samples on MO under UV (a) and visible light (b) irradiation

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Synthesis of Graphene/Ni/TiO₂/CNTs Composites and Photocatalytic Activities

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