Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 101, Issue -, Pages 104-110Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2012.01.028
Keywords
Advanced oxidation processes (AOPs); Diethyl phthalate (DEP); Ultrasound; Ultraviolet; Sonophotocatalysis; Synergistic effect
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Funding
- Mid-career Researcher Program [KRF-2009-0092799]
- National Research Foundation [KRF-2010-0025765]
- Ministry of Education, Science, and Technology
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Ultrasound (US) combined with ultraviolet (UV) irradiation and a titanium dioxide (TiO2) catalyst was used to effectively remove diethyl phthalate (DEP) from aqueous solutions. Single (sonolysis, photolysis, photocatalysis) and combined (sonophotolysis, sonophotocatalysis) processes were performed to confirm the synergistic effects and DEP degradation mechanism. Using only US, the optimum frequency for DEP degradation was 283 kHz. At this frequency a high rate of hydrogen peroxide (H2O2) formation was observed of approximately 0.32 mM min(-1). The pseudo-first order degradation rate constants were 10(-2)-10(-4) min(-1) depending on the process. Significant degradation and mineralization (TOC) of DEP were observed with the sonophotolytic and sonophotocatalytic processes. Moreover, synergistic effects of 1.29 and 1.95 were exhibited at the sonophotocatalytic and sonophotolytic DEP degradation, respectively. Furthermore, additional advantageous reactions may occur in the heterogeneous sonophotocatalytic process due to interactions between US, UV, and the photocatalyst. (c) 2012 Elsevier Ltd. All rights reserved.
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