Highly efficient magnetically separable TiO2-graphene oxide supported SrFe12O19 for direct sunlight-driven photoactivity

Aziz, A. and Yau, Y.H. and Puma, G.L. and Fischer, C. and Ibrahim, S. and Pichiah, S. (2014) Highly efficient magnetically separable TiO2-graphene oxide supported SrFe12O19 for direct sunlight-driven photoactivity. Chemical Engineering Journal, 235. pp. 264-274. ISSN 1385-8947, DOI https://doi.org/10.1016/j.cej.2013.09.043.

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Abstract

A highly solar photoactive, magnetically separable, TiO2-graphene oxide supported SrFe12O19 (TiO2/GO/SrFe12O19) photocatalyst was synthesised via the solid reaction of silica (SiO2)-coated SrFe12O19 with TiO2 and GO, which were produced by a hydrothermal reaction and Hummer's method, respectively. Several aspects of the material chemistry of the prepared photocatalyst were explored: its crystallite phase, particle size, surface morphology, inorganic elemental composition, adsorption-desorption hysteresis, BET surface area, organic functional group, chemical state of surface, magnetic hysteresis, coercivity (Hci), saturation magnetisation (Ms), remanence (Mr), thermal property and visible light absorption analysis. The synthesised TiO2/GO/SrFe12O19 exhibited greater ferromagnetic properties (Hci: 2103 Oe; Ms: 3.406E-3emug-1; Mr: 1.642E-3emug-1), which further enhanced its re-usability. The incorporation of GO and SrFe12O19 resulted in a drastic reduction in the bandgap energy (1.80eV). Moreover, this incorporation contributed for the higher visible light absorption. The photoactivity of TiO2/GO/SrFe12O19 was evaluated under direct sunlight for the degradation of 2,4-dichlorophenol (2,4-DCP). The degradation over a period of 5h suggested excellent photoactivity. © 2013 Elsevier B.V.

Item Type:	Article
Funders:	UNSPECIFIED
Additional Information:	Export Date: 13 February 2014 Source: Scopus CODEN: CMEJA Language of Original Document: English Correspondence Address: Pichiah, S.; Environmental Engineering Laboratory, Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: saravananpichiah@um.edu.my References: Lee, J.S., You, K.H., Park, C.B., Highly photoactive, low bandgap TiO2 nanoparticles wrapped by graphene (2012) Adv. Mater., 24, pp. 1084-1088; Zhang, D., Yang, X., Zhu, J., Zhang, Y., Zhang, P., Li, G., Graphite-like carbon deposited anatase TiO2 single crystals as efficient visible-light photocatalysts (2011) J. Sol-Gel. Sci. Technol., 58, pp. 594-601; Zhao, L., Chen, X., Wang, X., Zhang, Y., Wei, W., Sun, Y., Antonietti, M., Titirici, M.-M., One-step solvothermal synthesis of a carbon@TiO2 dyade structure effectively promoting visible-light photocatalysis (2010) Adv. 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Uncontrolled Keywords:	2,4-DCP degradation, Magnetic separation, Sunlight, TiO2, TiO2/GO/SrFe12O19, 2 ,4 dichlorophenol(2 ,4 dcp), 2 ,4-DCP, Ferromagnetic properties, Magnetically separable, Organic functional groups, TiO, Visible light absorption, Chemical analysis, Functional groups, Graphene, Titanium dioxide.
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering
Depositing User:	Mr Jenal S
Date Deposited:	19 Mar 2014 00:56
Last Modified:	03 Jul 2017 08:13
URI:	http://eprints.um.edu.my/id/eprint/9425

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