0000000000039834
AUTHOR
G Marcì
Heterogeneous photo-assisted catalytic hydration/dehydration reactions based on Keggin and Wells-Dawson type heteropolytungstates
Polyoxometalates (POMs) are a wide class of metal-oxygen clusters that can be applied in acid and oxidation catalysis, medicine, electrochemistry, materials design, or models for self-assembling nanoscale systems as long as green and cheap photocatalysts. Heteropolyacids (HPAs) are a POM subclass extensively used as homogeneous photocatalysts for the oxidation of organic substrates. Dispersing HPAs onto solid supports with a high surface area increases their specific surface area and hence (photo)catalytic activity. This chapter reports the use of selected HPAs, heteropolytungstates, immobilized on different supports as heterogeneous photocatalysts.
Magnetic hybrid nanomaterials for the photodegradation of microcontaminats in aqueous environment
Bio-based substances (BBS) isolated from urban biowaste have been employed to prepare hybrid magnetic nanomaterials with iron oxides. Such materials have been tested, in the presence of hydrogen peroxide, for the light induced photodegradation of four microcontaminants (MCs) in aqueous environment: Carbamazepine (C, an anticonvulsant and analgesic drug), Flumequine (F, an antibiotic), Ibuprofen (I, a non-steroidal anti-inflammatory drug), and Sulfamethoxazole (S, an antibiotic). Preliminary photodegradation experiments were carried out at lab-scale in a solar simulator, whereas optimized experiments were carried out in a pilot plant under natural solar radiation. The MCs complete abatement …
Solar heterogeneous photocatalysis for high added value molecules production
Ossidazione fotocatalitica selettiva di idrossimetilfurfurale in sospensione acquosa di nitruro di carbonio (C3N4) puro e trattato con H2O2 in un impianto pilota solare
In questo lavoro, viene confrontata l'attività del C3N4 sia puro che trattato con H2O2 per la conversione selettiva di HMF a FDC in mezzo acquoso e utilizzando un reattore solare su scala pilota.
Foto-reattori a membrana per la valorizzazione del CO2
In questo lavoro è stata studiata la foto-riduzione del CO2 sotto irraggiamento con luce UV-Visibile, accoppiando per la prima volta la tecnologia del reattore continuo a membrana con l’utilizzo di catalizzatori a base di C3N4 puro o compositi C3N4-TiO2 dispersi in una matrice polimerica di Nafion.
Graphitic C3N4 for CO2 reduction: a photoactivity and stability study
C3N4 for CO2 photoreduction: catalyst performance and stability in batch and continuous reactor
In this study, various C3N4 samples were prepared and characterized. CO2 photoreduction was carried out by using C3N4 as powder and coated on glass support in a batch reactor or embedded in a Nafion membrane in a continuous reactor
Doped Lanthanum Ferrite Perovskites: Promising Materials for Photocatalytic Applications
LaFeO3 perovskites both bare and containing 5 to 40 mol% of Cu(II) substituting Fe(III) have been prepared by the citrate auto-combustion synthesis method and used as heterogeneous photocatalysts for the degradation of 2-propanol in gas-solid regime under simulated solar light irradiation. The bare LaFeO3 resulted inactive, however the Cu(II) containing perovskite oxidized 2-propanol to propanone and eventually to CO2 and H2O. The most acive material resuted to be those with a 20% of Cu. Cu doping decreases the unit cell volume, and increases the distortion of (Fe/Cu)O6 octahedra, thus moving towards a configuration with four longer and two shorter bond lengths.