Here in, we have fabricated a composite of SiC and g-C 3 N 5 to form a noble -metal -free heterostructure as SiC/gC 3 N 5 for electrochemical HER activity. More than a few characterization techniques were investigated for their structural properties, such as the XRD, UV- DRS, FT-IR, FE-SEM, HR-TEM, and XPS measurements respectively. The HER reaction of SiC/g-C 3 N 5 heterostructure with an overpotential obtained from Tafel slope of 81 mV/dec vs RHE at 10 mA/cm 2 which is much better than that of the pristine SiC material. This work entitles that the effective approach for the rational design of g-C 3 N 5 -based electrocatalysts, for future developments in metal -free electrocatalysts.
The 2D transition metal WSe2, a strong photocatalyst, was combined with BiVO4 to create a p-n heterojunction photocatalyst using a hydrothermal process. The resulting 10% WSe2/BiVO4 (in the synthesized material, the mass ratio of WSe2 to BiVO4 is 1:10) composite showed impressive 94.5% efficiency in Methylene Blue (MB) degradation under visible light. Even after eight cycles, it maintained a 72% degradation rate, demonstrating robust photocatalytic stability. Experiments, including ·O2− and h+ capture and ESR analysis, revealed their vital roles in photocatalytic degradation. The exceptional performance of WSe2/BiVO4 is attributed to the internal electric field formed between WSe2 and BiVO4, enhancing carrier mobility.
In this study, Fe2O3/C3N4/NH2-MIL-125 ternary composite photocatalysts were synthesized. Their amino groups provided close bonding between these materials, facilitating the effective separation of electrons and holes. Besides, each component of Fe2O3/C3N4/NH2-MIL-125 plays a crucial role. NH2-MIL-125 provided a high surface area, C3N4 contributed to the primary photocatalytic activity, and Fe2O3 aided in enhancing light absorption, generating additional potential to produce hydroxyl radicals, thereby further enhancing photocatalytic activity. Moreover, the proportion of loaded Fe2O3 and C3N4 in the ternary material was investigated. It was found that Fe2O3/C3N4/NH2-MIL-125 with a 1:1 ratio of Fe2O3 and C3N4 (FeCN1:1/NM125) exhibited excellent photocatalytic performance, in which RhB degradation reached 100% under visible light irradiation, conforming to first-order kinetics analysis with a reaction rate constant k of 0.0164 min−1. Its efficiency was twice that of the binary catalyst C3N4/NH2-MIL-125 or Fe2O3/NH2-MIL-125, seven times that of the pristine catalyst C3N4, and ten times that of the pristine catalyst NH2-MIL-125. Scavenger experiments showed that the degradation efficiencies were 52.57%, 55.51%, and 63.41%, respectively, indicating that three active species, namely superoxide radicals, holes, and hydroxyl radicals, made significant contributions to photocatalysis.
A novel Deep Eutectic Solvent (ChCl/THFTCA-DES) was prepared by a mixture (2:1) of choline chloride [(CH3)(3)N+ CH2CH2OH]Cl- = (ChCl) and tetrahydrofuran-2,3,4,5-tetracarboxylic acid (THFTCA) as a cheap, simple, and non-toxic method, characterized by FT-IR, densito-meter, eutectic point, and H-1 NMR techniques and used as a capable and new catalyst for the synthesis of ten Henna-based benzopyranophenazine-carbonitriles.
Zeolite with nanoscale in some dimensions always display better catalytic performance because it contains more exposed catalytic active sites. Herein, a Cu2+ exchanged SSZ-39 zeolite with nanosheet morphology was chosen as a catalyst for the preparation of 2-vinyl heterocycle ethers through decarboxylative cross-coupling of cinnamic acids with ethers. The template reaction conditions were optimized, and the possible reaction mechanism was proposed. Then, a wide range of 2-vinyl heterocycle ethers were prepared. The recycling experiment demonstrated the good sustainability of the catalyst. The potential value of the catalytic product was demonstrated through the bifunctional addition and hydrogenation reduction.
