Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide

Tawfik A. Saleh; Vinod K. Gupta

doi:10.1016/j.jcis.2011.12.038

Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide

Tawfik A. Saleh
, Vinod K. Gupta^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

977 Scopus citations

Abstract

The high rate of electron/hole pair recombination reduces the quantum yield of the processes with TiO ₂ and represents its major drawback. Adding a co-adsorbent increases the photocatalytic efficiency of TiO ₂. In order to hybridize the photocatalytic activity of TiO ₂ with the adsorptivity of carbon nanotube, a composite of multi-walled carbon nanotubes and titanium dioxide (MWCNT/TiO ₂) has been synthesized. The composite was characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared absorption spectroscopy (FTIR), and diffuse reflectance UV-vis spectroscopy. The catalytic activity of this composite material was investigated by application of the composite for the degradation of methyl orange. It was observed that the composite exhibits enhanced photocatalytic activity compared with TiO ₂. The enhancement in photocatalytic performance of the MWCNT/TiO ₂ composite is explained in terms of recombination of photogenerated electron-hole pairs. In addition, MWCNT acts as a dispersing agent preventing TiO ₂ from agglomerating activity during the catalytic process, providing a high catalytically active surface area. This work adds to the global discussion of how CNTs can enhance the efficiency of catalysts.

Original language	English
Pages (from-to)	101-106
Number of pages	6
Journal	Journal of Colloid and Interface Science
Volume	371
Issue number	1
DOIs	https://doi.org/10.1016/j.jcis.2011.12.038
State	Published - 1 Apr 2012

Bibliographical note

Funding Information:
The authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through project No. 10-WAT1400-04 as part of the National Science, Technology and Innovation Plan.

Keywords

Carbon nanotube
Methyl orange
Photo catalyst
Titanium oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

Access to Document

10.1016/j.jcis.2011.12.038

Highly Cited Paper Award 2022
Saleh, T. (Recipient) & Gupta, V. K. (Recipient), 2022
Prize
Highly Cited Paper Award 2023
Awadh, T. (Recipient), 2023
Prize

Cite this

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title = "Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide",

abstract = "The high rate of electron/hole pair recombination reduces the quantum yield of the processes with TiO 2 and represents its major drawback. Adding a co-adsorbent increases the photocatalytic efficiency of TiO 2. In order to hybridize the photocatalytic activity of TiO 2 with the adsorptivity of carbon nanotube, a composite of multi-walled carbon nanotubes and titanium dioxide (MWCNT/TiO 2) has been synthesized. The composite was characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared absorption spectroscopy (FTIR), and diffuse reflectance UV-vis spectroscopy. The catalytic activity of this composite material was investigated by application of the composite for the degradation of methyl orange. It was observed that the composite exhibits enhanced photocatalytic activity compared with TiO 2. The enhancement in photocatalytic performance of the MWCNT/TiO 2 composite is explained in terms of recombination of photogenerated electron-hole pairs. In addition, MWCNT acts as a dispersing agent preventing TiO 2 from agglomerating activity during the catalytic process, providing a high catalytically active surface area. This work adds to the global discussion of how CNTs can enhance the efficiency of catalysts.",

keywords = "Carbon nanotube, Methyl orange, Photo catalyst, Titanium oxide",

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note = "Funding Information: The authors would like to acknowledge the support provided by King Abdulaziz City for Science and Technology (KACST) through the Science \& Technology Unit at King Fahd University of Petroleum \& Minerals (KFUPM) for funding this work through project No. 10-WAT1400-04 as part of the National Science, Technology and Innovation Plan. ",

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N2 - The high rate of electron/hole pair recombination reduces the quantum yield of the processes with TiO 2 and represents its major drawback. Adding a co-adsorbent increases the photocatalytic efficiency of TiO 2. In order to hybridize the photocatalytic activity of TiO 2 with the adsorptivity of carbon nanotube, a composite of multi-walled carbon nanotubes and titanium dioxide (MWCNT/TiO 2) has been synthesized. The composite was characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared absorption spectroscopy (FTIR), and diffuse reflectance UV-vis spectroscopy. The catalytic activity of this composite material was investigated by application of the composite for the degradation of methyl orange. It was observed that the composite exhibits enhanced photocatalytic activity compared with TiO 2. The enhancement in photocatalytic performance of the MWCNT/TiO 2 composite is explained in terms of recombination of photogenerated electron-hole pairs. In addition, MWCNT acts as a dispersing agent preventing TiO 2 from agglomerating activity during the catalytic process, providing a high catalytically active surface area. This work adds to the global discussion of how CNTs can enhance the efficiency of catalysts.

AB - The high rate of electron/hole pair recombination reduces the quantum yield of the processes with TiO 2 and represents its major drawback. Adding a co-adsorbent increases the photocatalytic efficiency of TiO 2. In order to hybridize the photocatalytic activity of TiO 2 with the adsorptivity of carbon nanotube, a composite of multi-walled carbon nanotubes and titanium dioxide (MWCNT/TiO 2) has been synthesized. The composite was characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared absorption spectroscopy (FTIR), and diffuse reflectance UV-vis spectroscopy. The catalytic activity of this composite material was investigated by application of the composite for the degradation of methyl orange. It was observed that the composite exhibits enhanced photocatalytic activity compared with TiO 2. The enhancement in photocatalytic performance of the MWCNT/TiO 2 composite is explained in terms of recombination of photogenerated electron-hole pairs. In addition, MWCNT acts as a dispersing agent preventing TiO 2 from agglomerating activity during the catalytic process, providing a high catalytically active surface area. This work adds to the global discussion of how CNTs can enhance the efficiency of catalysts.

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KW - Photo catalyst

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Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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Prizes

Highly Cited Paper Award 2022

Highly Cited Paper Award 2023

Cite this