Mesoporous silica-based carbon dot/TiO 2 photocatalyst for efficient organic pollutant degradation

Preparation of Cuprous Oxide Nanoparticles Coated with Aminated Cellulose for the Photocatalytic Reduction of Carbon Dioxide to Methanol

“…Fluorescence spectroscopy is commonly employed to study a photocatalyst's separation efficiency of photoelectron–hole pairs. An increase of the catalyst's fluorescence intensity causes the likelihood for a photon‐induced charge carrier to undergo recombination to increase, which in turn prevents the effective separation of the catalyst's photoelectron–hole pairs, leading to a compromised catalytic efficiency . In order to study the photoelectron–hole separation behavior associated with the recombination product of Cu 2 O and NCC‐EDA, the study here compares the fluorescence spectra associated with the aqueous dispersions of Cu 2 O and the composite product Cu 2 O/NCC‐EDA, with the results shown in Figure C. Upon excitation at 340 nm, Cu 2 O and Cu 2 O/NCC‐EDA exhibit their maximum emission peaks at 470 and 494 nm, respectively.…”

“…Fluorescence spectroscopy is commonly employed to study ap hotocatalystss eparatione fficiencyo fp hotoelectron-hole pairs.A ni ncreaseo ft he catalystsf luorescence intensity causes the likelihood for ap hoton-induced charge carrier to undergo recombination to increase,w hich in turn prevents the effective separation of the catalystsp hotoelectron-hole pairs,l eading to ac ompromised catalytic efficiency. [43] In order to study the photoelectron-hole separation behavior associated with the recombination product of Cu 2 Oa nd NCC-EDA,t he study here comparest he fluorescence spectra associated with the aqueous dispersions of Cu 2 Oa nd the composite product Cu 2 O/NCC-EDA, with the resultss hown in Figure 5C.U pon excitation at 340 nm, Cu 2 Oa nd Cu 2 O/ NCC-EDA exhibit their maximumemission peaks at 470 and 494 nm, respectively.A lso,t he luminous intensity of Cu 2 O/ NCC-EDA is markedly lower than that of Cu 2 O. Thecomposite productse mission peak experiences ar edshift, indicating that the range of its visible light absorption is widened; meanwhile,t he attenuation of fluorescence intensity indicates that the recombination likelihood of the productsp hotoelectron-hole pairs is indeed lower than that of the pure Cu 2 O.…”

Synthesis of Metal/Silica/Titania Composites for the Photocatalytic Removal of Methylene Blue Dye

“…e spectrum indicates that the prepared composite is free from contaminations and no unburnt carbon is present in it. Typical peaks conforming to TiO 2 and SiO 2 were attained as expected [16].…”

Preparation of porous TiO2 photocatalyts with different crystal phases and high catalytic activity by simple calcination of titanate nanofibers

“…According to BDDT (Brunauer-Deming-Deming-Teller) classication criteria, the isotherms of the samples are typical IV curves, and H3 hysteresis loops can be observed for the samples under different calcination temperature; these are typical isotherms of mesoporous materials. [22][23][24] With the increasing of calcination temperature, adsorption-desorption isotherm hysteresis loop of the products shis to the area with relatively higher pressure, and the area of hysteresis loop is gradually reduced. When the calcination temperature is higher than 750 C, the hysteresis loop almost disappeared, indicating that mesoporous structure was destroyed at a higher temperature.…”