Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite

As a result of large band gap and high recombination of photo-generated electronsholes within nanoseconds, which limit the effectiveness of anatase-phase titanium dioxide (TiO2) semiconductor nanoparticle. Active MWCNTs/TiO2 nanocomposites were fabricated by dispersing TiO2 onto the surface of fun...

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Main Author:	Abdullahi, Nura
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Nanocomposites (Materials) Titanium dioxide Photocatalysis
Online Access:	http://psasir.upm.edu.my/id/eprint/64518/7/FS%202015%2020IR.pdf
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id	my-upm-ir.64518
record_format	uketd_dc
spelling	my-upm-ir.645182018-11-01T07:59:16Z Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite 2015-06 Abdullahi, Nura As a result of large band gap and high recombination of photo-generated electronsholes within nanoseconds, which limit the effectiveness of anatase-phase titanium dioxide (TiO2) semiconductor nanoparticle. Active MWCNTs/TiO2 nanocomposites were fabricated by dispersing TiO2 onto the surface of functionalized multiwalled carbon nanotubes (fMWCNTs) and used it as a hotocatalyst. The optical, structural,and morphological properties of the as-prepared MWCNTs/TiO2 nanocomposites were studied. The typical particle sizes between 30 and 36 nm were achieved by TEM. This was supported by the crystal sizes of 16, 14 and 13 nm for MWCNTs/TiO2 ratios of (1:3), (1:2), and (1:1) respectively, evaluated from Shearer equation of the XRD spectra, which show the present of anatase and rutile states. The optical properties were characterized using UV-Vis reflection spectroscopy and found the band gap of 2.93, 2.86, and 2.75eV for MWCNTs/TiO2 ratios of (1:1),(1:2), and (1:3) respectively, calculated from Kubelka-Munk function. The PL peak intensity of TiO2 was higher for MWCNTs/TiO2 (1:3) as loading of TiO2 increased. The effect of the initial concentration of the methylene blue dye and pH of the medium were investigated on photocatalytic activity of the MWCNTs/TiO2 nanocomposites of the lowest band gap at the optimum mass ratio (1:3). It was found that the photodegradation followed the first order kinetics. The photocatalytic activity was found to increase with increase in the initial dye concentration after which it falls as the concentration of methylene blue is increased above optimum. At 30 min, 92.56 and 75.95% degradation efficiency were recorded for 10.2 and 7.0 pH solutions respectively. While in 1.9 pH solution, approximately 45.23% methylene blue degradation was recorded. Nanocomposites (Materials) Titanium dioxide Photocatalysis 2015-06 Thesis http://psasir.upm.edu.my/id/eprint/64518/ http://psasir.upm.edu.my/id/eprint/64518/7/FS%202015%2020IR.pdf text en public masters Universiti Putra Malaysia Nanocomposites (Materials) Titanium dioxide Photocatalysis
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Nanocomposites (Materials) Titanium dioxide Photocatalysis
spellingShingle	Nanocomposites (Materials) Titanium dioxide Photocatalysis Abdullahi, Nura Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
description	As a result of large band gap and high recombination of photo-generated electronsholes within nanoseconds, which limit the effectiveness of anatase-phase titanium dioxide (TiO2) semiconductor nanoparticle. Active MWCNTs/TiO2 nanocomposites were fabricated by dispersing TiO2 onto the surface of functionalized multiwalled carbon nanotubes (fMWCNTs) and used it as a hotocatalyst. The optical, structural,and morphological properties of the as-prepared MWCNTs/TiO2 nanocomposites were studied. The typical particle sizes between 30 and 36 nm were achieved by TEM. This was supported by the crystal sizes of 16, 14 and 13 nm for MWCNTs/TiO2 ratios of (1:3), (1:2), and (1:1) respectively, evaluated from Shearer equation of the XRD spectra, which show the present of anatase and rutile states. The optical properties were characterized using UV-Vis reflection spectroscopy and found the band gap of 2.93, 2.86, and 2.75eV for MWCNTs/TiO2 ratios of (1:1),(1:2), and (1:3) respectively, calculated from Kubelka-Munk function. The PL peak intensity of TiO2 was higher for MWCNTs/TiO2 (1:3) as loading of TiO2 increased. The effect of the initial concentration of the methylene blue dye and pH of the medium were investigated on photocatalytic activity of the MWCNTs/TiO2 nanocomposites of the lowest band gap at the optimum mass ratio (1:3). It was found that the photodegradation followed the first order kinetics. The photocatalytic activity was found to increase with increase in the initial dye concentration after which it falls as the concentration of methylene blue is increased above optimum. At 30 min, 92.56 and 75.95% degradation efficiency were recorded for 10.2 and 7.0 pH solutions respectively. While in 1.9 pH solution, approximately 45.23% methylene blue degradation was recorded.
format	Thesis
qualification_level	Master's degree
author	Abdullahi, Nura
author_facet	Abdullahi, Nura
author_sort	Abdullahi, Nura
title	Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
title_short	Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
title_full	Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
title_fullStr	Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
title_full_unstemmed	Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
title_sort	synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite
granting_institution	Universiti Putra Malaysia
publishDate	2015
url	http://psasir.upm.edu.my/id/eprint/64518/7/FS%202015%2020IR.pdf
_version_	1747812297169960960

Synthesis, characterization and photocatalystic activity of multiwalled carbon nanotubes/titanium dioxide nanocomposite

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