The influence of Cr doped TiO² on the optical property and photocatalytic activity under sunlight irradiation / Siti Zulaikha Suhaili … [et al.]

Suhaili, Siti Zulaikha and Yaakob, Muhamad Kamil and Saaid, Siti Irma Yuana and Jais, Umi Sarah (2016) The influence of Cr doped TiO² on the optical property and photocatalytic activity under sunlight irradiation / Siti Zulaikha Suhaili … [et al.]. Scientific Research Journal, 13 (1). pp. 100-114. ISSN 1675-7009

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Abstract

Pure Ti0₂ and Cr doped Ti0₂ (0.1-1.0wt% Cr) nanoparticles were synthesized via sol gel method. This study focuses on narrowing the Ti0₂ band gap energies in order to enhance the photocatalytic efficiency under visible light. The synthesized samples were characterized by X-Ray diffraction method (XRD), field emmision (FESEM) and also UV-Vis diffuse reflectance spectroscopy (DRS).The photocatalytic activity under sunlight irradiation was demonstrated by photocatalytic decomposition of methylene blue in water using UV/Vis spectrophotometer. The XRD analysis of pure Ti0₂ and doped Ti0₂ calcined at 500°C showed a mixture of anatase and rutile phases with decreasing crystallites size from 13.3nm to 11.6nm as the concentration of Cr was increased. The anatase-rutile phase transformation increased from 28.8% to 57.4%. An indication shows that at 0.75wt%, Cr the anatase and rutile phases have equal composition percentage. This study demonstrated that band gap energy of Ti0₂ was reduced with Cr doping which could enhance the photocatalytic efficiency. Sample containing 1.0wt% exhibit the lowest optical band gap energy at 2.86 eV. The optimum chromium doping concentration was found to be at 0.1 wt% Cr corresponding to band gap energy of 2.87 eV and degradation rate of 84%.

Item Type: Article
Creators:
CreatorsEmail
Suhaili, Siti ZulaikhaUNSPECIFIED
Yaakob, Muhamad KamilUNSPECIFIED
Saaid, Siti Irma YuanaUNSPECIFIED
Jais, Umi SarahUNSPECIFIED
Subjects: T Technology > TD Environmental technology. Sanitary engineering > Environmental pollution
Divisions: Institute of Research Management and Innovation (IRMI)
Journal or Publication Title: Scientific Research Journal
ISSN: 1675-7009
Volume: 13
Number: 1
Page Range: pp. 100-114
Item ID: 16135
Uncontrolled Keywords: Sol-gel chemistry; Optical properties; Titanium dioxide; Chromium; Photocatalytic activity
Last Modified: 16 Feb 2017 07:02
Depositing User: Staf Pendigitalan 5
URI: http://ir.uitm.edu.my/id/eprint/16135

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