An efficient CuO/rGO/TiO₂photocatalyst for the synthesis of benzopyranopyrimidine compounds under visible light irradiation

Abstract

In this study, we report on the preparation of copper oxide/reduced graphene oxide/titanium dioxide (CuO/rGO/TiO2) photocatalyst and its application in coupling reaction for carbon-nitrogen bond formation under visible light irradiation....

Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO2/Graphene Oxide Nanocomposites

“…An increase in the peak currents and a decrease in the separation between the peak potentials (ΔEp) at 100 mV·s −1 were observed for these two modified electrodes in comparison to the bare CPE, indicating that the electron transfer reaction was kinetically and thermodynamically favored at the copper oxides-decorated TiO 2 -modified electrode surface. Enhanced electron transfer capacity was also found by CV by Mirza-Aghayan et al for the CuO/rGO/TiO2 system [ 12 ]. In the case of the electrode modified with copper oxide-decorated TiO 2 /graphene oxide, peak currents and potentials decreased.…”

“…The spin-trapping method was employed in order to investigate whether the TC3 and TC3-GO samples generate ROS. Since HO • and O 2 •– are the radical species most commonly reported in TiO 2 systems [ 11 , 12 , 23 , 24 ], two spin traps were used: 5,5-dimethyl-1-pyrroline N-oxide (DMPO), sensitive to the HO • radical, and 1-hydroxy-3-carboxy-2,2,5,5-tetramethylpyrrolidine (CPH), having high affinity for the O 2 •– radical.…”

“…The optical absorption performance in the visible region could be enhanced by adding copper oxides and graphene oxide (GO) to TiO 2 nanoparticles [ 6 , 7 ]. Various methods of obtaining TiO 2 and GO based nanocomposites and their optical and photocatalytic properties extensive characterization are reported [ 8 , 9 , 10 , 11 , 12 ].…”

Photocatalytic degradation of methylene blue by efficient TiO2‐partially reduced graphene oxide composites

“…TiO 2 -PRGO and TiO 2 -PRGO(4h) have similar characteristic peaks around 1040 cm À1 that pure TiO 2 does not contain, which is the stretching vibration of C OH. 45 The change in the intensity of the characteristic peak at 1040-1200 cm À1 (C OH stretching vibration) also reflects a gradual increase in the degree of reduction.…”

Photocatalytic C–N bond construction toward high-value nitrogenous chemicals

“…32 As a more promising alternative way to homogeneous catalysis, heterogeneous photocatalytic C-H activation using a solid semiconductor (e.g., TiO 2 , CdS, g-C 3 N 4 , borocarbonitride, and WO 3Àx ) has gained increasing attention to directly produce amines. [49][50][51][52] The heterogeneous photocatalyst's structure is easy to adjust by building heterojunctions, oxygen vacancies, and doping methods, which could enhance visible light utilization. Concurrently, the catalyst can be easily separated from the reaction mixture for consecutive recycles.…”