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Synthesis of Carbon Nanotube-Supported Mn-TiO2 as a Photocatalyst under Visible Light

[ Vol. 11 , Issue. 1 ]

Author(s):

Mai Zhang, Jianping Gao, Tianlu Chen, K.P. Annamalai and Yousheng Tao*   Pages 45 - 49 ( 5 )

Abstract:


Background: TiO2 photocatalyst is promising for wastewater treatment, but it is still restricted under visible light.

Objective: To prepare TiO2 based-photocatalyst of good performance under visible light.

Methods: By doping manganese (Mn) and using multi-walled carbon nanotubes (MWCNTs) as a substrate, we prepared carbon nanotube-supported Mn-TiO2 (Mn-TiO2/MWCNTs) nano-composites with a solvothermal-annealing method. The samples were characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The photocatalytic activity of Mn-TiO2/MWCNTs was investigated by the degradation of methylene blue (MB) under visible light.

Results: It was found that Mn-TiO2 nanoparticles were loaded uniformly on the MWCNTs. Mn-TiO2/MWCNTs showed higher photocatalytic efficiency than pure TiO2 and Mn-TiO2. Only 47.0% of MB was degraded by TiO2 and 67.2% of MB was degraded by Mn-TiO2, while 80.0% of MB was degraded by Mn-TiO2/MWCNTs in 80 minutes.

Conclusion: Because the Mn doping reduced the energy gap of TiO2 and inhibited the recombination of photogenerated electron-hole pairs and because the large suface area and good electro-conductivity of MWCNTs enhanced the photocatalytic efficiency of TiO2, Mn- TiO2/MWCNTs showed an enhanced catalytic performance under visible light.

Keywords:

Carbon nanotubes, Mn-TiO2, nanocomposite, photocatalyst, synthesis, TiO2, treatment, visible light, wastewater.

Affiliation:

CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, College of Science and Technology, Agricultural University of Hebei, Huanghua 061100, CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002

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