Significant diethyl phthalate (DEP) degradation by combined advanced oxidation process in aqueous solution

Seungmin Na, Yun Gyong Ahn, Mingcan Cui, Jeehyeong Khim

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)104-110
Number of pages7
JournalJournal of Environmental Management
Publication statusPublished - 2012 Jun 30

Bibliographical note

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 .


  • Advanced oxidation processes (AOPs)
  • Diethyl phthalate (DEP)
  • Sonophotocatalysis
  • Synergistic effect
  • Ultrasound
  • Ultraviolet

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law


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