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2 Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

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Influence of adsorption and physicochemical properties of aerogels on photocatalytic processes.

Malinowska B., Walendziewski J., Robert D., Weber J.V., Stolarski M.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

2002

Vol. 10, nr 57

81-86

Titania aerogels were prepared. Their physicochemical properties and adsorption capability were determined. Commercial TiO2 Degussa was examined for comparison. The activities of the catalysts in the photocatalytic processes were tested. Two para derivatives of phenol were chosen as model compounds (p-chlorophenol and 4-hydroxybenzoic acid). There was no dependence of surface area and acidity on photoactivity of catalysts. It depends on pollutant type and adsorption ability of photocatalysts.

Influence of the adsorption on the photocatalytic reactions.

Robert D., Weber J.V.

Prace Naukowe Instytutu Chemii i Technologii Nafty i Węgla Politechniki Wrocławskiej. Konferencje

1999

Vol. 9, nr 56

129-134

The photodegradation processes using semi-conductor like TiO2 as a catalyst, provide new methods for waste water treatment. In this method the step of adsorption of organic compounds on the semi-conductor surface could have a prominent influence. We describe the adsorption phenomen for two classes of organic molecules (phenolic compounds and dicarboxylic acids) studied by diffuse reflectance infrared spectroscopy (IRFT-DRIFT mode). The relations between adsorption and degradation mechanisms has been approached. In particular, we presente the results of the dicarboxylic acids and phenolic compounds adsorption on TiO2 (P25) in aqueous phase. The Langmuir model gives a good representation of the adsorption of the boths studies organic compound families. In the case of the diacid, the DRIFT spectroscopy of loaded TiO2 enables to demonstrate the formation of a dicarboxylate film on the TiO2. The adsorption of phenol molecules with the plane of the aromatic ring parallel to the TiO2 surface is observed and confirmed by skeletal pattern simplification and the disappearance of the bending O-H absorption vibration shown phenolate ions formation and bonding with TiO2.