Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 52, Issue 4, Pages 275-280Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2004.04.013
Keywords
photocatalysis; molecular selectivity; endocrine disrupter; titanium oxide
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n-Octyl-grafted TiO2 (C8-TiO2) was prepared as a model of a photocatalyst with high molecular adsorption selectivity, and its photocatalytic activity for the decomposition of dilute 4-nonylphenol (an endocrine disrupter, ca. 2 ppm) in water was investigated. The catalyst was highly active in the presence of concentrated phenol (1000 ppm), and the 4-nonylphenol was decomposed in 180 min, while pristine TiO2 (P-25) under the same conditions showed much lower activity. The high C8-TiO2 activity was ascribed to the molecular selective adsorption of the organic molecules on the alkyl-grafted hydrophobic surface. Infrared spectra showed that the grafted alkyl groups were gradually decomposed under photoirradiation. The model catalyst demonstrated that molecular selective adsorption is important for removal of low-concentration contaminants in the presence of other, more concentrated compounds. (C) 2004 Elsevier B.V. All rights reserved.
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