Catalysis Communications最新文献

This study investigates the treatment of dyes AY36 and AB80 using photo-Fenton (PF) and Electro-Fenton (EF) systems, powered by an off-grid photovoltaic system. Employing PF (400 mg∙L-1 H2O2) with EF, degradation reached 71.47% and 85.64% at 436 and 624 nm. The introduced off-grid photovoltaic system ensured energy supply. Notably, a reduction of 53.56% in BOD and 9.90% in COD was observed in the analyzed effluent. The integrated of PF and EF, energized by a photovoltaic panel, not only demonstrated energy efficiency but also emphasized the sustainability of the treatment, aligning with environmentally friendly and renewable energy principles in wastewater treatment.

The grafting of Ga(iBu)₃ on a series of meso-H-ZSM5, prepared by desilication-dealumination (Si/Al = 25, 50, 100, 200, ∞), has been studied. Materials were characterized by IR, solid-state NMR, BET, ICP and EXAFS. Ga(iBu)₃ reacts selectively with silanol groups, yielding a monopodal surface species in the mesopores. Importantly, the Brønsted acidic sites remain intact in the micropores, as revealed by IR and ¹H MAS-NMR. These materials can be regarded as bifunctional catalysts, containing isolated Ga sites and Brønsted sites in proximity, suitable for propane aromatization. Catalytic investigations show high activity and selectivity toward aromatics, particularly for low Si/Al ratios.

Carbon supported Ru-Sn bimetallic catalyst shows excellent performance in room-temperature hydrogenation of acetone, 100% acetone conversion with 100% product selectivity to isopropyl alcohol can be achieved within a short reaction time. Catalyst structure-function relationship reveals a synergetic behavior between Ru and Sn sites, demonstrating the essential correlation between Sn/Ru atomic ratio and the resultant variation in catalytic performance. Room temperature hydrogenation of 4-heptanone was also studied, verifying the consistency of the established structure-function relationship in ketones hydrogenation reactions.

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.

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.

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%.

Ni/CeO₂ catalysts was prepared using different Ni precursors and examined for nitrogen oxide to ammonia reaction. The catalyst prepared from nickel acetate showed higher activity than that of other Ni precursors. The physiochemical properties and catalytic activity of these catalysts revealed that nickel acetate precursor was highly dispersed on the surface of CeO₂ and showed strong metal-support interactions which may be responsible for high catalytic activity.

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.

A rapid mechanical ball milling method at room temperature has been proposed for Mn²⁺ doping. The mechanical force generated by the ball milling process was able to hammer Mn atom into the Bi₃O₄Br lattice in an efficient and stable manner. Doping with Mn²⁺ produces a doping level in the forbidden band. Also, Mn²⁺ promptly scavenged the photogenerated holes, reducing the recombination of photogenerated carriers and promoting the production of numerous active species. As a result, Mn²⁺ doped Bi₃O₄Br exhibited enhanced photodegradation performance towards antibiotic tetracycline, in which the optimal efficiency arrives 81.74%, 1.22 times higher than Bi₃O₄Br.

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.