Multiwalled carbon nanotube/TiO2 nanocomposite as a highly active photocatalyst for photodegradation of Reactive Black 5 dye

doi:10.1016/S1872-2067(14)60210-2

Abstract

Abstract:

A nanocomposite UV-visible light-responsive multiwalled carbon nanotube (MWCNT)/titanium dioxide (TiO₂) nanophotocatalyst was successfully synthesized by a modified sol-gel method using titanium isopropoxide and functionalized MWCNTs as the starting precursors. The photocatalytic activity of the TiO₂ and the nanohybrid material was investigated through the photodegradation of Reactive Black 5 dye under ultraviolet light irradiation. X-ray diffraction analysis indicated that anatase phase was obtained for both the pure TiO₂ and the MWCNT/TiO₂ composite, while Raman spectroscopy confirmed the presence of MWCNTs in the composite. Field emission scanning electron microscopy revealed that TiO₂ nanoparticles with an individual diameter of about 10-20 nm were coated on the surface of the MWCNTs. The specific surface areas of the samples were found to be 80 and 181 m²/g for the pure TiO₂ and MWCNT/TiO₂, respectively. As a result, MWCNT/TiO₂showed better photocatalytic performance than pure TiO₂ because the high surface area of MWCNTs enabled them to function as good electron acceptors for the retardation of electron-hole pair recombination.

Key words: Multiwalled carbon nanotube, Titanium dioxide, Photocatalyst, Modified sol-gel, Reactive Black 5, Dye

Sharifah Bee Abd Hamid, Tong Ling Tan, Chin Wei Lai, Emy Marlina Samsudin. Multiwalled carbon nanotube/TiO₂ nanocomposite as a highly active photocatalyst for photodegradation of Reactive Black 5 dye[J]. Chinese Journal of Catalysis, 2014, 35(12): 2014-2019.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60210-2

https://www.cjcatal.com/EN/Y2014/V35/I12/2014

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Multiwalled carbon nanotube/TiO₂ nanocomposite as a highly active photocatalyst for photodegradation of Reactive Black 5 dye

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