The TiO2-mediated photodegradation of chloroethanoic acid, trichloroethene and tetrachloroethene, chosen as model molecules of aliphatic chloro-organics was studied at 303 +/- 2 K by employing polymeric membranes photografted on cellulose to immobilize the TiO2 (3.0-5.6 mg cm-2). The radiant flux in the absorption range and the volume-surface ratio in the photoreactor cell were kept constant at 2.5 +/- 0.2 mW cm-2 and 1.1 +/- 0.1 mL cm-2 respectively. The initial rate of photodegradation was studied as a function of the initial concentration of reactants by the linearized form of the Langmuir-Hinshelwood equation, by which rate constants k and equilibrium adsorption constants K were evaluated. Values of k (5.7 +/- 0.5-mu-mol h-1) are independent of the chemical nature of the three reactants investigated, in agreement with other literature findings. Values of K are compared with those measured in aqueous suspensions of TiO2 with the same chloro-organics and with the values predicted by a mechanism involving hydroxyl radicals as the primary oxidant adsorbed on the photocatalyst surface. Satisfactory performance and potential technological advantages of photocatalytic membranes are discussed.

PHOTOSYNTHETIC MEMBRANES .23. DEGRADATION OF SOME CHLOROALIPHATIC WATER CONTAMINANTS BY PHOTOCATALYTIC MEMBRANES IMMOBILIZING TITANIUM-DIOXIDE / I. BELLOBONO, M. BONARDI, L. CASTELLANO, E. SELLI, L. RIGHETTO. - In: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. A, CHEMISTRY. - ISSN 1010-6030. - 67:1(1992), pp. 109-115.

PHOTOSYNTHETIC MEMBRANES .23. DEGRADATION OF SOME CHLOROALIPHATIC WATER CONTAMINANTS BY PHOTOCATALYTIC MEMBRANES IMMOBILIZING TITANIUM-DIOXIDE

I. BELLOBONO
Primo
;
M. BONARDI
Secondo
;
E. SELLI
Penultimo
;
1992

Abstract

The TiO2-mediated photodegradation of chloroethanoic acid, trichloroethene and tetrachloroethene, chosen as model molecules of aliphatic chloro-organics was studied at 303 +/- 2 K by employing polymeric membranes photografted on cellulose to immobilize the TiO2 (3.0-5.6 mg cm-2). The radiant flux in the absorption range and the volume-surface ratio in the photoreactor cell were kept constant at 2.5 +/- 0.2 mW cm-2 and 1.1 +/- 0.1 mL cm-2 respectively. The initial rate of photodegradation was studied as a function of the initial concentration of reactants by the linearized form of the Langmuir-Hinshelwood equation, by which rate constants k and equilibrium adsorption constants K were evaluated. Values of k (5.7 +/- 0.5-mu-mol h-1) are independent of the chemical nature of the three reactants investigated, in agreement with other literature findings. Values of K are compared with those measured in aqueous suspensions of TiO2 with the same chloro-organics and with the values predicted by a mechanism involving hydroxyl radicals as the primary oxidant adsorbed on the photocatalyst surface. Satisfactory performance and potential technological advantages of photocatalytic membranes are discussed.
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/191032
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