The incorporation of decatungstate in polymeric membranes provides new heterogeneous photocatalysts for the oxidation of organic substrates performed in water under oxygen atmosphere at 25 °C. The photooxidation of water-soluble alcohols proceeds to completion, forming the carbonyl derivative as an intermediate, and leading to degradation products with a COD loss up to 70%. Solid state characterization techniques (SEM, IR) together with solution Uv-Vis analysis and kinetic studies allowed to identify, among diverse polymeric materials, the PDMS-based system as leaching free under irradiation and recyclable up to >300 turnovers (4 runs) with no major loss of activity. Membrane induced discrimination of the substrate results from the oxidations of a series of alcohols, through comparison with the homogeneous reactions.
Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate
Bonchio M;Carraro M;Fontananova E;Drioli E
2003
Abstract
The incorporation of decatungstate in polymeric membranes provides new heterogeneous photocatalysts for the oxidation of organic substrates performed in water under oxygen atmosphere at 25 °C. The photooxidation of water-soluble alcohols proceeds to completion, forming the carbonyl derivative as an intermediate, and leading to degradation products with a COD loss up to 70%. Solid state characterization techniques (SEM, IR) together with solution Uv-Vis analysis and kinetic studies allowed to identify, among diverse polymeric materials, the PDMS-based system as leaching free under irradiation and recyclable up to >300 turnovers (4 runs) with no major loss of activity. Membrane induced discrimination of the substrate results from the oxidations of a series of alcohols, through comparison with the homogeneous reactions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
