NDLI: Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO$

Content Provider	SpringerLink
Author	Ozaki, H. Giri, R. R. Taniguchi, S. Takanami, R.
Copyright Year	2008
Abstract	More effective techniques are required to mineralize the increasing number of recalcitrant organic contaminants at low concentrations in the water environment using advanced oxidation process. Though relatively new, photocatalytic ozonation (O$_{3}$/UV/TiO$_{2}$) is considered superior to ozonation (O$_{3}$) and photocatalysis (UV/TiO$_{2}$), due to synergistic effects and use of immobilized TiO$_{2}$ photocatalysts is a milestone in advance oxidation process. This article aimed to elucidate 2, 4-dichlorophenoxyacetic acid (2, 4-D) mineralization characteristics in low aqueous solutions by O$_{3}$/UV/TiO$_{2}$ using the world’s first high-strength TiO$_{2}$ fiber catalyst in laboratory experiments. 2, 4-D degradation and TOC removal in O$_{3}$, UV/TiO$_{2}$ and O$_{3}$/UV/TiO$_{2}$ followed pseudo-first order reaction kinetic. The removal rates for 2, 4-D and TOC in O$_{3}$/UV/TiO$_{2}$ were respectively about 1.5 and 2.4-fold larger than the summation of the corresponding values in O$_{3}$ and UV/TiO$_{2}$. The O$_{3}$/UV/TiO$_{2}$ process was characterized by short-lived few aromatic intermediates, faster degradations of aliphatic intermediates and dechlorination as a major step in 2, 4-D mineralization. The significantly enhanced 2, 4-D mineralization in the process was attributed to increased ozone decomposition and reduced electron-hole recombination on TiO$_{2}$ surface resulting to a large number of OH generation. The O$_{3}$/UV/TiO$_{2}$ process with the TiO$_{2}$ fiber catalyst was very promising with respect to the major challenges being faced in AOP involving TiO$_{2}$, namely separation of powder catalyst in suspension and reduced efficiency of immobilized catalysts (e.g. TiO$_{2}$ film/fiber).
Starting Page	17
Ending Page	26
Page Count	10
File Format	PDF
ISSN	17351472
Journal	International Journal of Environmental Science & Technology
Volume Number	5
Issue Number	1
e-ISSN	17352630
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-12-26
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Ecotoxicology Photocatalysis degradation intermediates Water Management Waste Water Technology hydroxyl radical Aquatic Pollution Environment Water Pollution Control rate constant total organic carbon Environmental Chemistry Environmental Science and Engineering Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Environmental Engineering Agricultural and Biological Sciences

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