0000000000016862
AUTHOR
G. Marcì
EPR study of polymeric carbon nitride photocatalysts
EPR spectrometry servea as a unique tool by characterization of polymeric carbon nitride photocatalysts and evaluation of its photocatalytic performance in suspension.
Photocatalytic solar light H2 production by aqueous glucose reforming
A series of tungsten and nitrogen doped Pt-TiO2 samples were prepared with the aim to extend the TiO2 absorption to the visible light region and to enhance the separation efficiency of the photogenerated electron/hole pairs. The physicochemical features of the powders were characterized by Xray diffraction (XRD), UV/Vis reflectance spectra, specific surface area (SSA) determinations, and transmission electron microscopy (TEM) analyses. The influence of the presence of different doping agents was evaluated, under anaerobic conditions, in the aqueous photo-reforming of glucose to form H2 at ambient pressure and temperature under a halogen lamp or natural solar light irradiation. Arabinose, er…
Carbon nitride nanosheets for the selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural to 2,5-furandicarboxyaldehyde in water suspension
Carbon nitride nanosheets for the selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural to 2,5-furandicarboxyaldehyde in water suspension
Study of the photocatalytic activity of Keggin and Wells Dawson heteropolyacids: role of the acidity and of the pseudo-liquid phase regime
Study of the photocatalytic activity of Keggin and Wells Dawson heteropolyacids: role of the acidity and of the pseudo-liquid phase regime
Emerging photocatalytic applications of graphitic carbon nitride
Graphitic carbon nitride assisted partial photocatalytic oxidation of the biomass platform molecule 5-hydroxymethyl-2-furfural (HMF) in aqueous medium was investigated. Different carbon nitride precursors were considered, being melamine the one yielding the most efficient photocatalyst The thermal exfoliation procedure of g-C3N4 gave rise to exfoliated samples with higher specific surface areas that also showed both an enhanced photocatalytic activity in conversion of HMF, and selectivity (ca. 42-45 %) towards FDC. The utilization of radical scavengers revealed that superoxide radicals were the main reactive species responsible for HMF oxidation to FDC. The use of natural solar light result…
Application of thermally exfoliated g-C3N4 for a green selective photocatalytic oxidation of 5-hydroxymethyl-2-furfural
Graphitic carbon nitride assisted partial photocatalytic oxidation of 5-hydroxymethyl-2-furfural (HMF) in aqueous medium was investigated. Different carbon nitride precursors were considered, being melamine the one yielding the most efficient photocatalyst. The obtained 30% selectivity of HMF oxidation towards 2,5-furandicarboxaldehyde (FDC) is higher than those reported up to now. A further thermal exfoliation of the g-C3N4 samples showed under artificial light irradiation both an enhanced photocatalytic activity in conversion of HMF, and selectivity (ca. 42-45 %) towards FDC. The performance of the catalysts increased when the experiments were carried out under real outdoor illumination, …
Overview on photoreforming of biomass aqueous solutions to generate H2 in the presence of g-C3N4 based materials
Photoreforming (PR) of biomass can be considered a viable technology under mild experimental conditions to produce hydrogen with a high reaction rate using compounds from renewable resources and waste materials. The application of biomass PR gives rise to both hydrogen generation and biomass waste valorization. The process could be scaled up to obtain hydrogen under natural sunlight irradiation, and research on polymeric carbon nitride (g-C3N4)-based photocatalysts has been widely carried out in recent years. The non-metallic-based carbon nitride materials are economical and (photo)stable polymer semiconductors, and their physicochemical surface and electronic properties are optimal for obt…
Ossidazione fotocatalitica selettiva di 5-idrossimetil-2-furfurale a 2,5-furandicarbossilaldeide in sospensioni acquose di nitruro di carbonio
Ossidazione fotocatalitica selettiva di 5-idrossimetil-2-furfurale a 2,5-furandicarbossilaldeide in sospensioni acquose di nitruro di carbonio
TiO2 Photocatalytic glucose conversion to H2 and high value chemicals
In this work it is reported the conversion of glucose in aqueous dispersion of various TiO2 based photocatalysts. Aerobic and anaerobic conditions were used to study the distribution of the products both in the liquid (arabinose, gluconic acid, fructose and formic acid) and gas (H2 and CO2) phases. Commercial and home prepared bare and Pt-supported TiO2 samples were used as the photocatalysts.
Photocatalytic membrane reactor for CO2 conversion
Photocatalytic membrane reactor for CO2 conversion
Polymeric C3N4 and O-doped C3N4: Photoelectrochemical and EPR Features for Selective Photocatalytic Oxidation of Alcohols to Aldehydes
Polymeric C3N4 and O-doped C3N4: Photoelectrochemical and EPR Features for Selective Photocatalytic Oxidation of Alcohols to Aldehydes
ZrO2 based materials: preparation, characterization and photocatalytic activity for 2-propanol oxidation and CO2 reduction
ZrO2 based materials: preparation, characterization and photocatalytic activity for 2-propanol oxidation and CO2 reduction
C3N4/reduced graphene oxide photocatalysts loaded with Ag or Ag/Pt for H2 evolution from aqueous solution of triethanolamine
Composites of C3N4/reduced graphene oxide have been used as photocatalysts for triethanolamine photo- reforming with H2 generation in aqueous solution. The rate of H2 production over the Ag loaded best per- forming photocatalyst reached 525 μmol⋅h
Photocatalytic glucose conversion to produce hydrogen in the presence of TiO2 based materials.
In the present research commercial anatase (BDH) and anatase/rutile (P25) and home prepared anatase (HPA), rutile (HPR) and brookite (HPB) TiO2 polymorphs and have been used as supports for the deposition of metallic Pt. The Pt-TiO2 samples have been tested in the glucose conversion under anaerobic conditions. The presence of Pt resulted essential for the production of H2 and the home prepared samples resulted more active than the commercial ones.
CO2 conversion in continuous photocatalytic membrane reactor
CO2 conversion in continuous photocatalytic membrane reactor
Photocatalytic Gas-Solid Propene Hydration and Liquid-Solid Glycerol Dehydration by using Keggin Heteropolyacids Supported on TiO2
Photo)catalytic propylene hydration to 2-propanol and glycerol dehydration to acrolein reactions were carried out by using Keggin heteropolyacids (HPAs) supported on TiO2. Binary materials have been prepared by impregnation of H3PW12O40, H3PMo12O40 and H4SiW12O40, on TiO2 Evonik P25. Moreover, a binary material consisting of H4SiW12O40 and TiO2 was prepared via a hydrothermal treatment and tested for the same reactions. All the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy observations (SEM) coupled with energy dispersive X-rayand (EDX) measurements, diffuse reflectance spectroscopy (DRS), Raman spectroscopy and Fourier transform infrared spectroscopy…
HMF Selective Photo-oxidation in Aqueous Suspension of Both Bare and H2O2 Treated Carbon Nitride Carried out in a Solar Pilot Plant
HMF Selective Photo-oxidation in Aqueous Suspension of Both Bare and H2O2 Treated Carbon Nitride Carried out in a Solar Pilot Plant