TY - JOUR
T1 - Significant diethyl phthalate (DEP) degradation by combined advanced oxidation process in aqueous solution
AU - Na, Seungmin
AU - Ahn, Yun Gyong
AU - Cui, Mingcan
AU - Khim, Jeehyeong
N1 - Funding Information:
This work was supported by the Mid-career Researcher Program ( KRF-2009-0092799 ) and Basic Science Research Program ( KRF-2010-0025765 ) through a National Research Foundation grant funded by the Ministry of Education, Science, and Technology .
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012/6/30
Y1 - 2012/6/30
N2 - 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.
AB - 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.
KW - Advanced oxidation processes (AOPs)
KW - Diethyl phthalate (DEP)
KW - Sonophotocatalysis
KW - Synergistic effect
KW - Ultrasound
KW - Ultraviolet
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U2 - 10.1016/j.jenvman.2012.01.028
DO - 10.1016/j.jenvman.2012.01.028
M3 - Article
C2 - 22406850
AN - SCOPUS:84857759776
VL - 101
SP - 104
EP - 110
JO - Journal of Environmental Management
JF - Journal of Environmental Management
SN - 0301-4797
ER -