

Highly active mesoporous SiO2-TiO2 based nanocomposites for photocatalytic degradation of textile dyes and phenol
Asima Siddiqa (1,*)




(1) National Centre for Physics, Quaid-i-Azam University Complex, Islamabad, 44000, Pakistan
(2) Chemistry Department, Hazara University, Mansehra, 21120, Pakistan
(3) National Centre for Physics, Quaid-i-Azam University Complex, Islamabad, 44000, Pakistan
(4) Chemistry Department, Hazara University, Mansehra, 21120, Pakistan
(*) Corresponding Author
Received: 10 May 2013 | Accepted: 03 Jun 2013 | Published: 31 Dec 2013 | Issue Date: December 2013
Abstract
Titania-silica nanocomposites (20% SiO2-TiO2, 30% SiO2-TiO2, 40% SiO2-TiO2 and 50 % SiO2-TiO2) with tailored morphology and tunable band energy have been synthesized successfully via micro emulsion method. The morphology, chemical composition, band gap energy and stability of prepared nanocomposites were investigated by XRD, SEM/EDX, FT-IR, DRS and TGA. While textural parameters such as surface area, pore volume, and pore diameter were evaluated by nitrogen adsorption-desorption isotherms. The prepared nanocomposites were employed for photocatalytic degradation of phenol and dyes (methyl yellow, auramine O, turquoise blue G) under visible light irradiations. The results of photocatalytic degradation and kinetic parameter (Kapp) strongly suggest that 20% SiO2-TiO2 showed remarkable photocatalytic efficiency in comparison to SiO2-TiO2 nanocomposites with high silica contents. These findings proved significantly that 20% SiO2-TiO2 have marked impact on the photocatalytic efficiency due to its high pore volume, more diameter, high availability of anatase TiO2 in nanocomposite and reduced bandgap energy.

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DOI: 10.5155/eurjchem.4.4.388-395.826
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National Centre for Physics, Pakistan
Citations
[1]. Morteza Montazerozohori, Masoud Nasr-Esfahani, Zohreh Moradi-shammi, Ameneh Malekhoseini
Photocatalytic decolorization of auramine and its kinetics study in the presence of two different sizes titanium dioxide nanoparticles at various buffer and non-buffer media
Journal of Industrial and Engineering Chemistry 21, 1044, 2015
DOI: 10.1016/j.jiec.2014.05.014

[2]. Zhenzhao Pei, Pei Wang, Zhiguo Li
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[3]. Christian Brice Dantio Nguela, Ngomo Horace Manga, Clément Marchal, Aimé Victoire Abega, Ndi Julius Nsami, Didier Robert
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