Document Type
Article
Publication Date
3-15-2015
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.
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
Divisions
fac_eng
Funders
Basic Science Research Program through a National Research Foundation of Korea (NRF) -Ministry of Education, Science and Technology KRF-2009-0092799 ,NRF 2013R1A1A2006586
Publication Title
Chemical Engineering Journal
Volume
264
Publisher
Elsevier
Additional Information
Cc2rh Times Cited:0 Cited References Count:43