Catalysis Communications最新文献

The Z-scheme LaCoO₃/ZnO (LCZ) heterojunction photocatalyst was designed and prepared using the hydrothermal method. In the photocatalytic degradation of tetracycline hydrochloride, LCZ exhibited the highest photocatalytic activity with a rate constant of 0.0179 ${min}^{-1}$,which is 3.2 and 2.3 times higher than those of pure ZnO and LaCoO₃, respectively. This study presents a promising approach with potential applications in the field of photocatalytic degradation. Further theoretical studies reveal that the existence of Z-scheme heterojunction can prevent the recombination of electron-hole pairs, leading to enhanced photocatalytic performance.

Amphiphilic SWCNH–In_0.2Cd_0.8S photocatalysts with various contents of amphiphilic SWCNHs have been prepared and characterized. The photocurrent density and H₂ production rate of the 0.38 wt% amphiphilic SWCNH–In_0.2Cd_0.8S photoelectrode (0.38 mA cm⁻² and 3.73 μmol h⁻¹ cm⁻², respectively) were 1.6 and 2.88 times higher, respectively, than those of the bare In_0.2Cd_0.8S photoelectrode. The improved photocatalytic hydrogen evolution efficiency of the 0.38 wt% amphiphilic SWCNH–In_0.2Cd_0.8S photoelectrode is attributed to a synergetic effect of the intrinsic properties of its components, including excellent charge transfer and separation at the interface between the amphiphilic SWCNHs and the In_0.2Cd_0.8S photocatalyst.

This work describes a simple method for the preparation of 5-hydroxymethylfurfural (HMF) by dehydrating fructose in DMSO, either with the use of an affordable catalyst or in a catalyst-free manner. This process can be accompanied, under harsh conditions, by the bromide-catalyzed Kornblum oxidation of the hydroxyl group by the solvent, resulting in the formation of 2,5-diformylfuran (DFF). The optimized techniques presented in this study can serve as a foundation for the production of valuable biobased furanic platform chemicals from renewable sources in any laboratory, stimulating the development of sustainable chemistry and research in related fields worldwide.

Advanced oxidation (AOPs) utilizing peroxymonosulfate (PMS) are efficient processes for the degradation of organic pollutants. This study aimed to synthesize and characterize cobalt ferrite (CoFe₂O₄), graphene oxide (GO), MIL-101(Fe), and their composite structures. The nanomaterials were applied as catalysts by PMS for triclosan (TCS) decomposition. The maximum removal rates of TCS were 49.29, 66.13, 84.04, 89.73, and 100% for PMS alone, CoFe₂O₄, GO, MIL-101(Fe), and CoFe₂O₄/MIL-101(Fe)/GO with PMS, respectively. Metal ions leaching declined in CoFe₂O₄/MIL-101(Fe)/GO/PMS compared with others. Hence, the composite nanomaterials appear to be effective catalysts for the degradation of organic pollutants by PMS activation.

The inadequate existence of practical techniques for water purification poses a prominent and widespread global environmental challenge. This study aims to clarify the efficacy of xanthan application in the photocatalytic removal of nadolol, pindolol, and cefoperazone from water reservoirs. Under the influence of a simulated solar light source, xanthan exhibited significant degradation rates for pindolol (77%) and cefoperazone (91%). In contrast, nadolol's degradation efficiency was notably lower (10%). These findings suggest that the molecular structure can substantially influence the efficiency of the purification process. Computational analyses were conducted to gain a more profound understanding of the implications of molecular structure.

5-6 nm hydrophilic Ni_xCo_(1-x) NPs was synthesized by a cost-effective and scalable method and was coated onto conductive substrates without any binders or additives thanks to its small particle effect and possiblely magnetic effects. Then, the Ni_xCo_(1-x) NPs can be transformed into Ni_xCo_(1-x)(OH)₂ by an OER-activating strategy. Optimized by the composition effect, the Ni_0.8Co_0.2/CF exhibits best activity for supercapacitors (2124F/g). Underling mechanism of the OER evolution process well studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrometry, X-ray absorption near-edge spectra (XANES). Density functional theory (DFT) calculations was performed and verify the synergistic effect of nickel and cobalt and the support effect.

The insertion of multicomponent photoactive guests into zeolite channels improves photoredox and photocatalytic efficiency. In this report, we present the synthesis of a variety of composites comprising Pd-doped TiO₂ and zeolite NaY (ZeoNa-Y@TiO₂/Pd) and investigate their photocatalytic efficacy. The zeolite NaY serves as a host for the active titanium dioxide phase, while the palladium nanoparticle acts as a co-catalyst. The zeolite NaY in the catalyst composition enhances the efficiency by hindering the electron-hole recombination. The most efficacious catalyst shows a hydrogen production rate of 3.5 mmol.g⁻¹.h⁻¹. The degradation of the methylene blue dye reaches discoloration and mineralization above 98%.

The low charge separation and transfer of g-C₃N₄ hinders its industrial application in photocatalytic hydrogen evolution. Here, we design a novel co-catalyst strategy to integrate Ag₂Se nanoparticles in situ on the surface of g-C₃N₄. The optimized photocatalyst, 15% Ag₂Se/g-C₃N₄, demonstrates remarkable photocatalytic efficiency in the hydrogen evolution rate, reaching to 1102.8 μmol·g⁻¹·h⁻¹, 7 times higher than g-C₃N₄. To further elucidate the photocatalytic activity of 15% Ag₂Se/g-C₃N₄, we present a possible mechanism based on various characterizations and density functional theory calculations. This research offers potential insights for the future development of silver chalcogenide composites in photocatalysis.

The Cu-doped mesoporous silica-based particles (Cu-BMS) were prepared using an evaporation-induced self-assembly sol-gel procedure as a heterogeneous catalyst for the activation of peroxydisulfate (PDS). The formation of well-organized mesoporous structures with amorphous nature and high surface area of 286 m²/g was demonstrated. The catalytic activity of Cu-BMS in the degradation of Methylene Blue (MB) and the effects of operating parameters, including Cu-BMS dosage, initial PDS amount, initial MB concentration, temperature and initial pH, were investigated in details. The Cu-BMS demonstrated a remarkable catalytic activity (93.5% degradation efficiency within 60 min) and good stability.