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

Author(s): Mai Zhang, Jianping Gao, Tianlu Chen, K.P. Annamalai, Yousheng Tao*.

Journal Name: Recent Innovations in Chemical Engineering
Formerly: Recent Patents on Chemical Engineering

Volume 11 , Issue 1 , 2018

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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.

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Article Details

VOLUME: 11
ISSUE: 1
Year: 2018
Page: [45 - 49]
Pages: 5
DOI: 10.2174/2405520411666180219150151

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