Enhanced sonocatalytic treatment of ibuprofen by mechanical mixing and reusable magnetic core titanium dioxide

Kang, K. and Jang, M. and Cui, M. and Qiu, P. and Na, S. and Son, Y. and Khim, J. (2015) Enhanced sonocatalytic treatment of ibuprofen by mechanical mixing and reusable magnetic core titanium dioxide. Chemical Engineering Journal, 264. pp. 522-530. ISSN 1385-8947, DOI https://doi.org/10.1016/j.cej.2014.10.106.

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Abstract

As a reusable sonocatalyst, magnetically separable titanium dioxide (MST) was synthesized by a sol-gel method and was evaluated in the removal of ibuprofen (IBP). MST was carefully characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), N-2 gas isotherms, band-gap energy, magnetization, zeta potential, and particle size distribution. The kinetics of IBP removal by sonolysis or MST-assisted sonocatalysis was systematically evaluated with various operational parameters such as pH, temperature, ultrasound (US) frequency, and mechanical mixing intensity. For the first time, authors found that mechanical mixing had an opposite effect on the oxidation rate constants of IBP removal by sonolysis or sonocatalysis according to US frequency. Specifically, the magnitude orders of oxidation rate constants in sonolysis and sonocatalysis with mixing (350 rpm) were the same (35 > 1000 > 300 > 500 > 700 kHz), but sonolysis without mixing showed the following order: 500> 1000 >35 kHz. In addition, the removal rate constant of IBP by sonocatalysis at the lowest US frequency (35 kHz) increased exponentially as the mechanical mixing speed increased. MSM exhibited a high reusability because it has similar rate constants with an average value of 17 +/- 0.3 x 10(-3) min(-1) five repetitive kinetic tests. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Article
Funders:	Basic Science Research Program through a National Research Foundation of Korea (NRF) -Ministry of Education, Science and Technology KRF-2009-0092799 , NRF 2013R1A1A2006586
Additional Information:	Cc2rh Times Cited:0 Cited References Count:43
Uncontrolled Keywords:	Magnetically separable titanium dioxide, ibuprofen, sonolysis, sonocatalysis, mixing, methylene-blue, ultrasonic irradiation, aqueous suspensions, water-treatment, tio2 catalysts, rhodamine-b, degradation, nanoparticles, sonoluminescence, photocatalysts,
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 Aug 2015 02:46
Last Modified:	19 Aug 2015 02:46
URI:	http://eprints.um.edu.my/id/eprint/13961

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