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Synthesis and structural features of mesoporous NiO/TiO2 nanocomposites prepared by sol–gel method for photodegradation of methylene blue dye

Paper ID Volume ID Publish Year Pages File Format Full-Text
28166 44062 2012 8 PDF Available
Title
Synthesis and structural features of mesoporous NiO/TiO2 nanocomposites prepared by sol–gel method for photodegradation of methylene blue dye
Abstract

A novel series of mesoporous NiO/TiO2 nanoparticles was successfully synthesized by sol–gel method using cetyltrimethylammonium bromide as controlling template in attempts to study the photodegradation of methylene blue dye. Structural and textural features of the composite samples were investigated by X-ray diffraction (XRD), nitrogen adsorption–desorption isotherm, Fourier transformer infra-red (FTIR) and transmission electron microscope (TEM). The band energy gap of the samples was estimated using UV–vis spectrometer. A remarkable reduction in particle size to 4 nm and increasing the surface area up to 220 m2/g is detected upon increasing nickel oxide contents revealing the successful role of dopants in controlling the crystal growth and pore structure of the catalyst. Nearly complete mineralization of methylene blue dye occur significantly at higher rate over doped samples compared with pure titanium oxide. The degradation of the dye follows a pseudo first-order kinetics and the apparent rate constant increases with increasing the nickel oxide content up to 5 mol%. The exceptional photocatalytic activity of the samples was attributed to reduction in particle size, increasing in surface area, photoelectron/hole separation efficiency and the extension of the wavelength range of photoexcitation.

Graphical abstractPhotocatalytic degradation of methylene blue dye was successfully carried over Ni/TiO2. Embedded 5 mol% NiO compared with pure titania.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mesoporous NiO/TiO2 nanocomposites were successfully synthesized by sol–gel method. ► Design of particle structure by micelle template approach. ►The nanocomposites exhibit mesoporous structure with large surface area and nanoparticle size. ► The existence of nickel oxide is a prime factor in controlling nature of phase and particle size. ► Complete photocatalytic degradation of methylene blue dye was successfully carried over the nanocomposite samples.

Keywords
Mesoporous nanocomposites; Sol–gel; Rietveld analysis; TEM; Energy band gap; Methylene blue degradation
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Synthesis and structural features of mesoporous NiO/TiO2 nanocomposites prepared by sol–gel method for photodegradation of methylene blue dye
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 238, 15 June 2012, Pages 63–70
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us