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Photocatalytic Oxidation of PCE and Butyraldehyde over Titania Modified with Perovskite Optical Crystal BaTiO 3
Author(s) -
Vajifdar K. J.,
Chen D. H.,
Gossage J. L.,
Li K.,
Ye X.,
Gadiyar G.,
Ardoin B.
Publication year - 2007
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200600194
Subject(s) - photocatalysis , perovskite (structure) , absorbance , butyraldehyde , chemistry , visible spectrum , band gap , photochemistry , inorganic chemistry , analytical chemistry (journal) , materials science , catalysis , optoelectronics , organic chemistry , chromatography
Photocatalysis utilizes near‐UV or visible light to break down organic pollutants into innocuous compounds at room temperatures. This paper introduces the use of semiconducting optical crystals as an additive to a photocatalyst. The perovskite optical material BaTiO 3 (band gap of 3.7–3.8 eV) is found to increase VOC destruction when black light is used. The best composition found is 0.1 wt % BaTiO 3 with the balance being TiO 2 . This photocatalyst increases tetrachloroethylene (PCE) conversion by 12 % to 32 % for space times between 1.4 and 17.2 seconds and inlet concentrations of 40 to 130 ppm with a 4 W black light. The average enhancement is approximately 25 %. For butyraldehyde conversion the maximum enhancement is 20 % at 130 ppm in 3.6 seconds. The UV/VIS spectroscopy data indicate a lower absorbance with the additive. The reaction parameters studied are space velocity, inlet concentration and light source. Oxidation by‐products are identified using a GCMS.