Journal of Porous Materials最新文献

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.

Activating low concentration persulfate (PS) to realize high-efficiency oxidation of NO is the key to reduce the cost of denitration by PS. In this paper, cobalt ferrite anchored reduced graphene oxide (CoFe₂O₄@rGO) was prepared by hydrothermal synthesis, and coupled with ultraviolet light (UV) was used to activate low concentration PS to oxidize and absorb NO in flue gas. The study found that UV irradiation significantly improved the catalytic performance of CoFe₂O₄@rGO, and the greater UV power, the higher the denitration efficiency. It can not only activate PS, but also reduce the recombination probability of photoelectrons and holes of CoFe₂O₄. With the aid of the oxidation ability of surface holes and the super electron transfer ability of rGO, the high-efficiency denitration of low-concentration PS is realized. When the UV was 18 W, PS concentration was 0.02 mol/L, the dosage of CoFe₂O₄@rGO was 0.2 g/L, the initial pH of solution was 6, 90% and 96.1% NO were oxidized to nitric acid under 45℃ and 70℃ respectively. Finally, CoFe₂O₄@rGO was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET specific surface area, hysteresis cycle etc., and the denitrification mechanism of photo-assisted CoFe₂O₄@rGO activated PS was speculated.

The utilization of biomass as a feedstock for aviation kerosene production serves to alleviate demand pressure on petroleum resources. In this work, commercial hydroxyapatite (HAP) was used as a support to fabricate a series of mono- and bimetallic Pt-Ni catalysts via impregnation. These catalysts were then evaluated for the decarboxylation of oleic acid under a non-hydrogen atmosphere. The XRD and TEM analyses revealed that the Pt metal particles were highly dispersed, whereas the Ni particles exhibited a tendency toward aggregation with increasing loading. Furthermore, Pt-Ni bimetallic particles exhibited aggregation with elevated Ni content. Combined NH₃-TPD and Py-IR characterization indicated that the 1.5Pt2Ni/HAP bimetallic catalyst possessed appropriate acidity(5.18 cm³/g STP) and abundant Lewis acid sites, as evidenced by a Brønsted-to-Lewis ratio of 0.32. Catalytic results demonstrated that under CO₂ atmosphere at 340 °C and 18 bar for 6 h, the 1.5Pt2Ni/HAP catalyst achieved complete conversion of oleic acid and the yield of C₈-C₁₇ alkanes reached as high as 85.0%.

Herein, green synthesis approach for boehmite-derived Ni-W/Al₂O₃ catalysts, employing biopolymer-based pore-making agents to enhance kerosene hydrodesulfurization (HDS) is reported. This study aims to investigate how the type and loading of biopolymer pore-making agents affect the porosity, surface area, metal dispersion, and catalytic performance of Ni–W/Al₂O₃ catalysts for HDS of kerosene. The boehmite precursor was converted to γ-Al₂O₃ under controlled conditions, and Ni-W metals were subsequently deposited onto the porous support via incipient wetness impregnation method. Various biopolymers including starch (ST), cellulose (CE), chitosan (CH), and biochar (BC) were tested as pore-making agents, resulting in different pore structures and surface properties. BET, FE-SEM, EDS-Mapping, TEM, TGA, XRD, and side crushing strength (SCS) analyses were performed to evaluate the properties of the synthesized samples. Among the evaluated agents, the 15 wt% CH demonstrated the highest pore volume, measuring 1.05 cm³.g^-1 and kerosene HDS efficiency of 98.03%. Additionally, the Al₂O₃ synthesized using CE, showed a superior SCS of 41 N.mm^-1 and achieved a sulfur removal efficiency of 96.78%. Additionally, gas chromatographic (GC) analysis of the gaseous product revealed minimal cracking reactions.

Alendronate Sodium (ALD) is a class III drug according to the Biopharmaceutical Classification (BSC). It is characterized by low bioavailability and limited oral absorption. This limitation can be overcome by developing a controlled drug delivery system using SBA-15 and SBA-16. The synthesized materials were characterized by various physicochemical techniques like FT-IR, TGA, BET, XRD, SEM, and HRTEM. An in vitro release study was carried out in simulated body fluid (pH 7.4) under stirring conditions with two different carriers for their drug delivery potential and compared with the release profile of the marketed formulation, which was further supported by an in vitro dissolution study. To study reaction kinetics and mechanism, different models like zero order, first order, and Higuchi model were used. Taking into account the anti-cancer potential of ALD, cytotoxicity studies were carried out using an osteosarcoma cell line for the synthesized materials.

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Detecting trace levels of volatile organic compounds (VOCs) at ambient conditions with high accuracy remains a major hurdle for gas sensors based on metal oxide semiconductors (MOS). In this study, we developed a hybrid material by integrating Poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT: PSS) with tungsten oxide (WO₃) via a combination of solvothermal synthesis and in situ polymerization. The structural and morphological features of WO₃ and the PEDOT: PSS@WO₃ hybrid were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and elemental mapping. Gas-sensing performance tests were conducted for PEDOT: PSS, WO₃, and PEDOT: PSS@WO₃ towards several hazardous gases, including methanol (CH₃OH), ammonia (NH₃), hydrogen sulfide (H₂S), nitrogen dioxide (NO₂), and carbon dioxide (CO₂). Parameters such as sensitivity, response and recovery times, and repeatability were systematically evaluated. Among the tested gases, the PEDOT: PSS@WO₃ sensor exhibited superior response and heightened sensitivity toward methanol. Specifically, the sensor’s response to CH₃OH concentrations of 1, 50, and 100 ppb were approximately 14 ± 2%, 355 ± 5%, and 798 ± 10%, respectively. Furthermore, the device demonstrated fast response and recovery times of 30 ± 0.05 s and 35 ± 0.03 s for 100 ppb methanol at room temperature. The capability to operate efficiently at ambient conditions underscores the potential of this hybrid material for environmental monitoring. These findings highlight that the well-aligned PEDOT: PSS@WO₃ composite is a highly promising platform for rapid and selective methanol detection.

This study explores the development of carbon aerogels (CA) derived from oil palm fronds (OPF) with chitosan (CS) reinforcement and silver nanowires (AgNWs) incorporation for oil absorption and antimicrobial applications. Cellulose nanofibrils (CNF) were extracted from OPF and mixed with CS in varying mass ratios (2:1, 1:1, 1:2, and 1:3) before undergoing freeze-drying and carbonization at temperatures of 300 °C. The resulting carbon aerogels (CAn) were further functionalized with AgNWs (CAn-x) using a dip-coating technique. The CAn-x samples were observed low density (< 0.0318 g/cm3), high porosity (> 92%), specific surface areas (> 43 m²/g), selectivity for oils and superhydrophobicity (WCA > 176^◦). In addition, the CAn-x exhibited absorption capacity for marine fuel oil (MFO), palm oil (PO), and high-speed diesel oil (HSD) ranged from 20 to 76 g/g with reusable until 26 times, influenced by the aerogel’s pore structure. The CS improved the aerogel’s structural integrity, enhancing reusability over multiple absorption-desorption cycles. AgNWs loading imparted strong antimicrobial activity, particularly against Gram-negative bacteria (E. coli and S. typhi), as demonstrated by the agar diffusion method. The results suggest that CA-AgNWs composites exhibit excellent oil absorption performance, selectivity, and reusability, along with broad-spectrum antimicrobial properties. These findings highlight the potential of OPF-derived carbon aerogels as multifunctional materials for environmental and medical applications. This research demonstrates a sustainable approach to utilizing biomass waste for creating high-performance absorbents with tailored properties. Future work may focus on optimizing the composition and processing conditions for enhanced application efficiency.

Mesoporous hierarchical Y zeolites were synthesized through a sequential process involving dealumination with ethylenediaminetetraacetic acid (EDTA) or oxalic acid (OX), followed by desilication using sodium hydroxide (NaOH). Characterization of the materials, employing X-ray diffraction (XRD), nitrogen adsorption–desorption, and scanning electron microscopy (SEM), confirmed significant structural modifications, an increase in mesoporosity, and an enhancement in external surface area. The OX–NaOH route demonstrated superior efficiency, achieving stable mesopores with surface areas exceeding 110 m²/g in shorter treatment times compared to the EDTA pathway. Catalytic testing in vacuum gas oil cracking at 420 °C revealed that the modified zeolite (DSY-OX3) yielded 41.1 vol% gasoline, a substantial improvement over the 18.4 vol% obtained with the parent Y zeolite. These findings suggest that the OX–NaOH method is a time- and energy-efficient approach for producing thermally stable mesoporous zeolites, making it a promising strategy for fluidized catalytic cracking (FCC) applications.