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Surface Prechlorination of Anatase TiO 2 for Enhanced Photocatalytic Oxidation of Toluene and Hexane
Author(s) -
d'Hennezel Olga,
Ollis David F.
Publication year - 2001
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/1522-2675(20011114)84:11<3511::aid-hlca3511>3.0.co;2-k
Subject(s) - chemistry , toluene , acetone , hexane , chlorine , dichloromethane , x ray photoelectron spectroscopy , anatase , inorganic chemistry , photocatalysis , catalysis , organic chemistry , chemical engineering , solvent , engineering
We report the influence of prechlorination of TiO 2 powder on the activity for the photocatalyzed oxidation of hydrocarbons (toluene, hexane) and oxygenates (acetone, butan‐1‐ol). Water‐ and HCl‐pretreated catalyst are prepared by impregnation of TiO 2 powder in H 2 O and in HCl solutions, respectively, followed by drying at room temperature. X‐Ray photoelectron spectroscopy (XPS) analysis demonstrates the surface prechlorination efficiency: 1 g of TiO 2 impregnated with 3 ml of 3 n HCl solution results in a chlorine surface concentration of 1.6%. Prechlorination results in a photo‐oxidation‐rate enhancement for toluene and hexane, no change for butan‐1‐ol, and inhibition for acetone. This pattern is the same as that demonstrated earlier by us when these reactants are co‐fed with the chlorine source trichloroethylene (TCE).