Journal of Porous Materials最新文献

Catalytic conversion of glycerol to dihydroxyacetone (DHA) has significant advantages, including abundant raw material sources (as glycerol is a by-product of biodiesel) and high added value of the product. Although CuO-based catalysts are currently the most widely used materials in this field, existing catalyst modification strategies are insufficient, and their activity still needs to be improved. In this work, for the first time, a template-induced Au/CuO catalyst with zeolite molecular sieve SBA-15 as the template was prepared via the mechanochemical method, achieving a new breakthrough in the performance of CuO catalysts. The obtained catalyst is characterized by the fact that the introduction of SBA-15 alters the morphology and physical properties of CuO, resulting in smaller gold nanoparticles (Au NPs) and a stronger interaction between the active centers and the support. Under the preparation conditions of a ball-to-powder ratio of 1:15, a milling time of 0.5 h, addition of 0.4 g SBA-15, and an Au loading of 1%, and under the reaction conditions of 100 ℃, a glycerol-to-Au ratio of 100:1, and a reaction time of 2 h, the catalyst achieves a glycerol conversion of 97.65% and a DHA selectivity of 90.47%, outperforming most catalysts reported so far. This work provides new insights for the efficient modification of CuO-based catalysts and the development of high-performance catalytic materials.

In this research, a fungicide, namely quintozene (QZ) fungicide, was successfully intercalated into zinc hydroxide nitrates (ZHN) with sodium dodecyl sulphate (SDS) surfactant by using a co-precipitate and direct reaction method to form new nanomaterials, ZHN-SDS-QZ. PXRD analysis indicated the successful intercalation with the basal spacing of 33.6 Å. The presence of QZ fungicides in the interlayer space of zinc layered hydroxide is also supported by FTIR and elemental analysis. The thermal analysis confirmed that ZHN-SDS-QZ nanomaterials had good thermal stability compared to the pure QZ. The intercalation of QZ leads to important changes in the morphology, porosity and surface area. Nitrogen adsorption-desorption isotherms reveal that the adsorption isotherm types according to BET analysis for ZHN–SDS are Type IV, while for ZHN-SDS-QZ are Type III. The release into aqueous solution of Na₃PO₄ and Na₂CO₃ was governed by pseudo-second order, while for the aqueous solution of NaCl was the Fickian diffusion model. Overall, this nanomaterial is a promising material to develop pest control solutions in the agriculture sector that are effective, yet promote minimal risk to human health and the environment, ensuring food security, safety and ecological sustainability. This study demonstrates that ZHN-SDS-QZ exhibits enhanced stability and controlled release behaviour, making it a promising nanocarrier for sustainable agrochemical delivery.

A new magnetic nanocomposite, GO/Fe₃O₄/ZIF-67 was constructed and analyzed using various methods such as FT-IR, XRD, FE-SEM, EDS, STA, and BET. The integration of GO/Fe₃O₄ and ZIF-67 has been developed through a straightforward procedure to indicate the benefits of both materials and to demonstrate their synergistic effects. The fabricated nanocomposite is utilized as a novel reusable magnetical nanocatalyst for the production of polyhydroquinoline derivatives. The corresponding products were fabricated in short times (5–20 min.) without the use of solvent with outstanding yields (87–97%). The experiments presented multiple advantages, including exceptional yields, quick reaction time, and straightforward separation. The present method was clean and convenient, requiring just 10 mg of GO/Fe₃O₄/ZIF-67 to carry out the reaction. The findings indicate the development of a promising nanocatalyst with outstanding performance. Additionally, because of the nanocomposite’s magnetic separability and excellent stability, GO/Fe₃O₄/ZIF-67 can be retrieved and reused multiple times with minimal decrease in effectiveness.

A novel mesoporous magnesium tungstate (MgWO₄) catalyst with a yarn ball-like morphology using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent was pioneered the design and successfully prepared via a solvothermal method in this work, and the catalytic performance was subsequently investigated in the Baeyer-Villiger (B-V) oxidation of cyclohexanone to ε-caprolactone within an O₂/benzaldehyde co-oxidation system. The physicochemical and structural properties of MgWO₄ were thoroughly characterized using a suite of analytical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Nitrogen adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), Inductively coupled plasma (ICP) and Hammett indicator methods. The engineered pore structure can enhance oxygen adsorption capacity to promote the oxidation of cyclohexanone and alleviate mass transfer constraints. The Y-MgWO₄(22%) catalyst, exhibiting a 1.9-fold increase in specific surface area, a 3.1-fold larger pore volume, and moderate basicity, achieved catalytic activity approximately 179% higher than the CTAB-free MgWO₄ substrate. The catalyst maintained stable performance over more than eight reuse cycles, indicating its viability for industrial application.

The rapid development of industry and transportation has given rise to serious noise pollution, which posing serious threats to the social economy and human physical and mental health. However, commonly existing fiber sound-absorbing materials are difficult to dissipate noise at low frequencies due to their single-pore structure. Herein, a hierarchical pore-structured elastic ceramic fibrous aerogel with fire-resistance was successfully designed and constructed through directional freeze-casting technology. The self-assembled nano-network and hierarchical pore structure by ceramic nanofiber improved noise injection and acoustic contact area. The noise reduction coefficient of the obtained ceramic fibrous aerogel reaches 0.49, and the maximum value of the sound absorption coefficient can be close to 1. In addition, the hydrophobic groups of the binder endow the fiber aerogel with superhydrophobic properties and bond adjacent fibers together to prevent slipping during deformation, imparting it with excellent compression resilience. Moreover, this ceramic aerogel can resist temperatures up to 600 °C, exhibiting excellent compression resilience under the flame of an alcohol lamp, safe guarding building occupants. The successful construction of lightweight, hydrophobic, fire-resistant gradient structure aerogel will provide a new prospect for the upgrading of the next generation noise absorber.

This study successfully synthesized Graphene Oxide (GO) using a modified Hummers’ method and doped it with La₂O₃ at varied percentages. The synthesized materials were characterized using BET surface area, BJH pore volume, powder X-ray diffraction, Raman spectroscopy, temperature-programmed desorption of CO₂, field emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The synthesized La₂O₃/r-GO adsorbents were evaluated for CO₂ adsorption under different temperature settings at atmospheric pressure. At a temperature of 25 °C, the adsorbent 15La₂O₃/r-GO, with a pore volume of 1.85 cm³/g, demonstrated a superior adsorption capacity of 5.37 mmol/g under ambient circumstances compared to conventional materials, owing to its elevated BET surface area of 123 m²/g and basicity of 0.621 mmol/g. The high adsorption effectiveness can be attributed to the greater number of basic sites on the adsorbent and an increased surface area. This adsorbent demonstrated remarkable adsorption performance and high CO₂ adsorption efficacy after five cycles in recyclability studies, indicating its durability.

Petroleum coke (PC) is characterized by its high carbon content and low cost, but its elevated sulfur content and dense structural configuration constrain high-value utilization and electrochemical applications. To address these limitations, this study employed PC combined with three lignocellulosic model components (cellulose, hemicellulose/xylan, lignin) for synthesizing porous carbon materials through KOH-catalyzed co-pyrolysis. Systematic characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and electrochemical measurements demonstrated that KOH activation effectively removed sulfur impurities while significantly enhancing material porosity and surface area. Among the biomass components, hemicellulose (xylan) exhibited the most pronounced pore-forming effect. The optimized material achieved a specific capacitance of 463.9 F/g at 50 mV/s with over 82% capacitance retention after 5000 cycles, demonstrating exceptional electrochemical stability. This work establishes a novel strategy for transforming petroleum coke into high-performance supercapacitor electrode materials.

This research aimed to develop stable and efficient heterogeneous catalysts by designing and synthesizing UiO-68-Pd, a zirconium-based metal-organic framework that incorporates pre-fabricated palladium (Pd) nanoparticles within its highly porous structure. Using a solvothermal synthesis method, the resulting material achieved an exceptional specific surface area of 739.2 m²/g, with palladium content confirmed via ICP measurements at 0.75 × 10⁻³ mol/g. To thoroughly evaluate the material, an array of advanced analytical techniques was employed, including inductively coupled plasma (ICP) analysis, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) surface area analysis. A pivotal innovation of this work lies in the immobilization of active Pd nanoparticles within the chemical matrix of UiO-68, effectively mitigating issues such as agglomeration and metal leaching. The catalytic potential of UiO-68-Pd was assessed for the synthesis of diaryl sulfide derivatives under mild reaction conditions. Exhibiting outstanding catalytic performance, the material achieved a maximum yield of 98% while demonstrating remarkable stability across repeated use. Even after four consecutive cycles, the catalyst maintained impressive efficiency with a yield retention of 96%. These attributes, including high catalytic activity, reusability, and operational stability under mild conditions, highlight UiO-68-Pd as a compelling candidate for long-term applications in organic synthesis.