Catalysis Communications最新文献

Here in, we have fabricated a composite of SiC and g-C₃N₅ to form a noble-metal-free heterostructure as SiC/g-C₃N₅ 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-C₃N₅ heterostructure with an overpotential obtained from Tafel slope of 81 mV/dec vs RHE at 10 mA/cm² which is much better than that of the pristine SiC material. This work entitles that the effective approach for the rational design of g-C₃N₅-based electrocatalysts, for future developments in metal-free electrocatalysts.

It is critical to enhance the photocatalytic performance of BiOBr through appropriate strategies. Two BiOBr samples with different water (W) and ethylene glycol (EG) solvents have been synthesized. BiOBr-EG presents a 3D nest-like morphology composed of nanoplates, prominently emphasizing (110) facets. In contrast, BiOBr-W displays 2D microplates with exposed (102) facets. Notably, BiOBr-EG exhibits a degradation rate 7.4 times faster and removal efficiency of Enrofloxacin (ENR) 2.2 times greater than that of BiOBr-W. Additional investigations reveal that ·O₂⁻ plays a dominant role in the degradation process. Finally, the degradation pathways are explored through DFT calculation and HPLC-MS methods.

Catalytic ozonation has become one of the most promising technologies for wastewater treatment due to its high efficiency in the removal of organic pollutants. Three carbon materials (carbon nanotubes, graphene oxide and activated carbon) and five pharmaceutical compounds were selected for this study. All tested parent pollutants were easily degraded by single ozonation. In terms of mineralization, the presence of catalyst revealed to be necessary to enhance organic matter removal, and activated carbon (GAC) showing superior performance. To evaluate the effect of the water matrix, experiments were performed with ground water and wastewater and significant degradation of pollutants was achieved.

1,4-cyclohexanedimethanol (CHDM) is used as a high-value polyester monomer. On the basis of the catalysts of RuSn and Pd, the compound catalysts of RuSn and PdCe are prepared by adding the additive Ce to the Pd-based catalyst. The results showed that the yield of CHDM increased by 13.4% after the addition of Ce, indicating that Ce is conducive to the activation of HH and CO thus promoting the hydrogenation of carboxyl groups. Furthermore, the addition of Ce effectively slows down the coverage of the compound on the active component Pd, prolonging the lifespan of the catalyst.

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.