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Effect of silanization of titanium dioxide on photocatalytic decomposition of 2,4‐dinitropheonol under irradiation with artificial UV light and sunlight
Author(s) -
Shiraishi Fumihide,
Ueno Mariko,
Chand Rumi,
Shibata Yuichiro,
Luitel Hom Nath
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4100
Subject(s) - photocatalysis , decomposition , aqueous solution , titanium dioxide , triethoxysilane , irradiation , mixing (physics) , silanization , materials science , toluene , chemistry , chemical engineering , diffusion , photochemistry , catalysis , organic chemistry , composite material , physics , quantum mechanics , nuclear physics , engineering , thermodynamics
Abstract BACKGROUND TiO 2 ‐based heterogeneous photocatalysis is an effective way to degrade harmful refractory organic compounds. However, the rate of photocatalytic reaction is significantly decreased by film diffusion resistance and several other factors. To overcome this problem, TiO 2 immobilized on a stainless steel screen is hydrophobically treated using a ( γ ‐aminopropyl) triethoxysilane–toluene solution and the performance of the silanized TiO 2 for the photocatalytic decomposition of 2,4‐dinitrophenol (2,4‐ DNP ) is investigated.RESULTS The reactant 2,4‐ DNP is slowly decomposed when its aqueous solution is treated using an unsilanized TiO 2 screen without mixing the solution, whereas the rate of decomposition is certainly increased by use of a silanized TiO 2 screen, and further increased by mixing the solution. The use of sunlight as a UV light source provides a higher rate of decomposition than does the use of an artificial UV lamp. The rate of decomposition in a well‐mixed solution is less affected up to 1.5 cm in solution depth.CONCLUSIONS The use of the TiO 2 screen silanized with a 2% silane–toluene solution under liquid mixing decreases film diffusion resistance and facilitates rapid decomposition of 2,4‐ DNP . The simultaneous use of sunlight as a UV light source and a wind‐powered propeller for liquid mixing is effective. © 2013 Society of Chemical Industry