Sensitized P25 TiO2 was prepared by wet impregnation with a home-prepared perylene dye, i.e., N,N′-bis(2-(1-piperazino)ethyl)-3,4,9,10-perylene-tetracarboxylic acid diimide dichloride (PZPER). Energy levels of PZPER werefound to be compatible with those of TiO2 allowing fast electron transfer. The obtained catalyst has been characterized and used in the gas-phase partial oxidation of aliphatic primary and secondary alcohols, i.e., methanol, ethanol, and 2- propanol. The reaction was carried out under cut-off (λ>400 nm) simulated solar radiation in O2 atmosphere. The perylene derivative allowed a good absorbance of visible radiation thanks to its low optical energy gap (2.6 eV) whichwas evaluated by cyclic voltammetry. The optimal organic sensitizing amount was found to be 5.6 % w/w in terms ofyield in carbonyl derivatives. Moreover, no change in reactivity/selectivity was observed after 10-h irradiation thusconfirming the catalyst stability. Yields into formaldehyde, acetaldehyde, and acetone were 67, 70, and 96 %, respectively.No significant amounts of organic byproducts were detected but for methanol oxidation, whereas a minor amount of thesubstrate degraded to CO2.
|Numero di pagine||7|
|Rivista||ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL|
|Stato di pubblicazione||Published - 2014|
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Health, Toxicology and Mutagenesis