阿拉丁SCI论文搜索工具

Textiles, by virtue of their porous structure, furnish a propitious environment for the proliferation of microorganisms, potentially jeopardizing human daily life. Consequently, textile materials endowed with rapid and long - lasting antibacterial capabilities are extensively required in diverse scenarios. Copper sulfide (CuS) possesses favorable photothermal and catalytic properties and can be employed in the preparation of antibacterial textiles. Herein, we prepared a series of novel CuS nanoflower decorated amine-grafted polyacrylonitrile (APAN) textiles through two steps aqueous method where Cu ion was first been chelate on fiber surface and introduce sodium sulfide to form CuS through an in-situ replacement. The morphology, structure, and corresponding antimicrobial ability for the obtained CuSNP-APAN were examined. The optimal APAN/CuS fiber (i.e. APAN/CuS 100 ) achieved 99.99 % antibacterial efficiency against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) within 30 min and 45 min respectively under simulated sunlight irradiation. Even for the drug-resistant Methicillin-resistant Staphylococcus aureus (MRSA), modified fiber showed an extremely high antibacterial rate (84.73 %) after 2 h contact, much higher than the original APAN fibers and the as-prepared APAN/CuSO 4 and APAN/CuS 50 . Even after 100-cycles washes, the antibacterial rate of APAN/CuS 100 still kept high and the leaching of Cu 2 + was 0.24 mg L −1 . This study provides a reliable approach for photothermal catalytic bacterial deactivation, and expand the application for amine-grafted polyacrylonitrile fibers. 相关产品

The indiscriminate use of organic dyes without adequate wastewater treatment can result in severe water pollution and pose significant threats to biological health. This underscores the urgent need for the development of advanced materials capable of selectively removing contaminant organic dyes from water systems. In this study, highly crystalline covalent organic framework (COF) materials with pyridine structures were synthesized via a molten polymerization method, employing a Knoevenagel condensation reaction between 2,4,6-trimethylpyridine and 1,4-phthalaldehyde. Following modification with hydrochloric acid, cationic COF materials (S-iCOF) were obtained. These positively charged COF exhibited excellent crystallinity and a high specific surface area of up to 354.1 m2 g−1. They demonstrated exceptional efficiency in adsorbing anionic dyes, with maximum adsorption capacities of 481.7 mg g−1 for methyl orange (MO) and 460.4 mg g−1 for orange II (O II). The adsorption behavior adhered to a pseudo-second-order kinetic model. Furthermore, due to the difference in charge, S-iCOF exhibited significantly lower adsorption capacities for cationic dyes such as methylene blue (MB) and crystal violet (CV), enabling its use as a selective adsorbent for separating dyes with different ionic properties. By changing the 1,4-phthalaldehyde to 4,4′-biphenyldicarbaldehyde, the pore size of the COFs could be precisely expanded. It was demonstrated that large-pore cationic COFs (L-iCOF) are more advantageous for the removal of medium- to large-sized dyes. The molten polymerization method used for the synthesis of iCOF is both cost-effective and efficient. This study highlights the immense potential of cationic COFs for removing and separating organic dye pollutants from wastewater, offering promising applications in the remediation of organic contamination. 相关产品

A new CeCO 3 OH@(hexagonal/cubic phases–CdS) (CeCO 3 OH@(H/C–CdS)) composite catalyst was facilely synthesized by a simple microinjection titration–stirring method, in which CdS nanoparticles were dispersed on the surface of CeCO 3 OH nanolines. The optimal conditions for the preparation of composite catalysts with high photocatalytic performance were determined by single-factor experiments and response surface experiments. Under these conditions, the degradation rate of 30 mL 2.000 g/L rhodamine B (Rh B) by CeCO 3 OH@(H/C-CdS) in a photocatalytic reaction for 1 h at 25 °C was up to 86.81 % and its degradation rate in a photocatalytic reaction for 150 min was up to 99.62 %. The degradation rate could be maintained above 80 % even after six times recycling. Especially, the photocatalytic degradation efficiency of 2.000 g/L Rh B on the composite catalyst under sunlight and at room temperature for 30 min reached 97.66 %. Meanwhile, the large size of CeCO 3 OH considerably alleviated the agglomeration of CdS, providing more adsorption and active sites for visible light-mediated degradation of Rh B. Importantly, the Z-scheme charge transfer realized by CdS and CeCO 3 OH enhanced the efficient separation of photogenerated electrons and holes, and successfully inhibited the recombination of photogenerated electrons with holes. At the same time, owing to the low energy band difference between the two phases of CdS, charge was transferred between the hexagonal and cubic phases, leaving more effective photogenerated charge to participate in the degradation of Rh B. The synergism of the heterophase junction and heterojunction and the presence of oxygen and sulfur vacancies considerably enhanced the degradation performance of the catalyst. Thus, this study provides a new strategy for the modification and enhanced visible-light catalysis performance of CdS-based catalysts. 相关产品

Electrochemical nitrite (NO2–) is a promising technology for NO2– removal and a sustainable method for generating valuable ammonia (NH3), but this process is intricate and generates other byproducts. In this work, we propose a facile and low-cost method for the preparation of a Cu3Mo2O9 nanosheet array, which can serve as an efficient electrocatalyst for the reduction of NO2– to NH3. The morphology of Cu3Mo2O9 can be adjusted by controlling the synthesis conditions. In neutral solution, Cu3Mo2O9 achieves a high NH3 yield of 30.46 mg h–1 cm–2 and an outstanding faradaic efficiency of 98.6% with excellent long-term electrochemical stability for NO2– reduction. Density functional theory calculations further reveal the key role of the Cu3Mo2O9 (202) surface and its possible reaction pathways in the electrocatalytic reduction of nitrite. 相关产品

Surface-enhanced Raman scattering (SERS) is an emerging swift and nondestructive detecting method, offering a unique structural signature of analytes down to ultrasensitive levels. Herein, we present a novel SERS-based core-shell nanostructure with optimized silver shell thicknesses, capped with 2-mercaptoethylamine (2-MCE), to simultaneously detect multiple agrochemical residues in fruit samples. Compared to unmodified Au@AgNPs, the modified Au@Ag@2-MCENPs integrated with SERS exhibited improved sensitivity and stability, exhibiting a strong relationship between the SERS intensities and pesticide concentrations in the fruit samples, with LODs of 0.006 and 0.008 ppm for thiacloprid and 0.007 and 0.009 ppm for oxamyl in pear and apple fruit samples, respectively. Moreover, the method showed satisfactory recoveries ranging from 80 % to 106.5 % for thiacloprid and 81.8 % to 110.2 % for oxamyl in both fruit samples. Furthermore, this method presented rapid and simultaneous detection capabilities, significantly reducing analysis time compared to traditional methods, making it suitable for detecting other toxic chemical residues in agricultural products. 相关产品

Developing hierarchical zeolites is highly important for catalytic applications. In this study, micro- and submicron-sized hierarchical ZSM-5 zeolites, composed of aggregated nanosized ZSM-5 crystals, were facilely synthesized without any mesoporogen. The effects of the gel composition in a mesoporogen-free system on the formation of ZSM-5 aggregates were studied. The results revealed that the Na 2 O/SiO 2 molar ratio and the aluminum source exerted significant impacts. Furthermore, we demonstrated that the morphology and size of the ZSM-5 aggregate could be easily adjusted by varying the gel composition. Mechanistic insights indicated that the formation of hierarchical ZSM-5 aggregates in the mesoporogen-free system likely followed a space-confined growth mechanism. 相关产品

In recent years, electromagnetic pollution has become a growing concern, and electromagnetic wave absorption materials are increasingly used to mitigate its effects. This study presents a biomass cotton/nickel MOFs-derived Ni@ nanoporous carbon@ carbon fiber (Ni@ NPC@ CF) composite material, prepared using hydrothermal and thermal decomposition methods. Microscopic observations reveal a uniform distribution of Ni@ NPC@ CF on the carbon fiber matrix. The composite exhibits multiple electromagnetic wave loss mechanisms: magnetic loss from nano‑nickel particles and electrical loss from nanoporous carbon and carbon fibers. With only a 20 % filling ratio and a thickness of 2.75 mm, the material achieves an RL min of −67 dB and an effective absorption bandwidth (EAB) of 7.23 GHz (RL < -10 dB). This study offers a practical solution for utilizing biomass as a high-performance, cost-effective, eco-friendly, and renewable carbon-based absorbent material, providing valuable insights for developing electromagnetic wave absorbing composites. 相关产品

Ultrafine platinum nanowires have drawn considerable attention due to their promising applications in electrocatalytic fields. Despite the numerous reports on Pt nanostructures, the one-pot synthesis of ultrafine Pt nanowires on conductive substrate still remains challenge. Herein, we demonstrate the facile solvothermal synthesis of ultrafine Pt nanowires with an average diameter of 1.4 nm and an average length of 16.8 nm in-situ assembled on muti-walled carbon nanotubes. The surface properties of MWCNT, solvent composition, and reductants determine the final morphology of Pt NWs. The Pt NWs/CNT prepared under optimal synthesis conditions are demonstrated to be a potential electrocatalyst for acidic HER, exhibiting only 64 mV overpotential at 100 mA/cm 2 in 0.5 M H 2 SO 4 . The mass activity of 15.2 A/mg Pt at an overpotential of 70 mV and the exchange current density of 0.53 mA/cm 2 Pt are 2.2 and 1.3 times higher than that of commercial Pt/C, respectively. DFT calculations reveal the planar-sites on Pt nanowires exhibit appropriate H adsorption free energy, and the abundant edge-sites of ultrafine structure ensure optimal H adsorption behavior at high coverage, thus contributing to the excellent HER performance of Pt NWs. 相关产品

Organic dyes containing azo/anthropquinone groups pose severe ecological risks due to their toxicity and persistence. Therefore, in this study, covalently cross-linked agarose aerogel was used as the substrate, and the Cu-BTC metal-organic framework (Cu-MOF) was loaded via in-situ growth at room temperature to prepare a Cu-MOF @ agarose composite aerogel (Cu-MOF@AGA) adsorbent. The introduction of Cu-MOF endows Cu-MOF@AGA with more adsorption sites and a larger specific surface area (210.78 m²/g). The characteristic peaks at 2θ values of 6.6, 9.4, and 11.5 in the XRD pattern indicate the successful loading of Cu-MOF. Meanwhile, SEM images show that the 3D macroporous structure of Cu-MOF @AGA provides a rapid mass - transfer channel for pollutant molecules. FT-IR results reveal that Cu-MOF@AGA has more functional groups (such as -OH, -COOH) and active sites. The adsorption mechanism was analyzed using XPS and FT-IR, revealing that the adsorbent achieves adsorption of methylene blue (MB) and Congo red (CR) through hydrogen bonding, π-π interactions, and electrostatic interactions. Kinetic and isotherm fitting analyses demonstrated that the maximum adsorption capacities for methylene blue and Congo red reached 59.48 and 159.85 mg/g, respectively. Finally, after five cycles of adsorption experiments, the removal rates for MB and CR remained above 85 %, indicating that the adsorbent exhibits excellent reusability and promising application potential. 相关产品

The persistent presence of antibiotic contaminants, such as fluoroquinolones (FQs), in aquatic environments poses significant environmental risks. In this study, a porous poly(glycidyl methacrylate) (PPGMA) microsphere adsorbent was designed for the efficient removal of FQs. Acrylate monomers were dispersed in water to prepare an oil-in-water high internal phase emulsion, which was subsequently subjected to ultraviolet (UV) irradiation for 3 min to prepare the microsphere with high yield. To template the porous structure, cyclohexane, a poor solvent for the polymer, was introduced into the initial monomer oil phase, and its influence on the evolution of porous morphology was systematically investigated. Thereafter, the porous microsphere was modified through grafting with polyethyleneimine to facilitate the in-situ growth of a metal-organic framework, UiO-66-NH 2 . The modification progress was monitored, and the final UiO@PPGMA microspheres were comprehensively characterized. Based on adsorption kinetics and thermodynamics, the microsphere containing only 2.78 % UiO-66-NH 2 exhibits significantly enhanced adsorption rate and capacity, which can be attributed to the in-situ grown UiO-66-NH 2 nanoparticles. Furthermore, the UiO@PPGMA microsphere can be easily regenerated, allowing it to be packed in a column for cyclic fixed-bed adsorption. Consequently, our results demonstrate a facile strategy for preparing porous microsphere adsorbents, which may have promising applications in the removal of antibiotic contaminants from water sources. 相关产品

Polymer dots (PT-PDs) were obtained through a “synthesis-modification integration” method by using polyethyleneimine (PEI) and tartaric acid (TA) as raw materials. The designed PT-PDs displayed a nanoscale structure with an average size of 1.6 nm, and bright blue fluorescence (FL) emission with a fluorescence quantum yield (QY) of 14.3%. Moreover, the PT-PDs were used as a sensing platform for the sensitive and quantitative detection of tetracyclines (TCs) and Al 3+ via fluorescence quenching and recovery. The LODs for tetracycline hydrochloride (TCH), doxycycline (DOX), and Al 3+ were 94.8 nM, 76.7 nM, and 177.8 nM, respectively. In addition, PT-PDs incorporated with polyacrylamide were used for the recognition of TCs and Al 3+ in a portable manner on the basis of the fluorescence “ON–OFF-ON” strategy, which revealed great application in the field of anti-counterfeiting and encryption. Graphical 相关产品

Wastewater treatment contributes to the sustainable utilization of water resources for alleviating water scarcity. The application of polymeric materials as adsorbents for eliminating hazardous substances in water has garnered extensive attention owing to their remarkable adsorption efficiency, stability, and selectivity. Herein, a facile strategy is provided to rapidly synthesize poly(acrylic acid- co -sodium 2-acrylamide-2-methylpropanesulfonate) (poly(AA- co -NaAMPS)) hydrogels with exceptional adsorptive capacity via frontal polymerization (FP). The FP processes are meticulously examined in terms of initiator dosage and monomer ratio. The as-prepared hydrogels demonstrate pH-responsive swelling ability and pH-dependent adsorption capacity for various dyes and heavy metal ions. Compared with traditional batch polymerization (BP), the hydrogels prepared by FP exhibit superior swelling and adsorption abilities. Additionally, research on the adsorption mechanism for both dyes and heavy metal ions is conducted by fitting the adsorption kinetic data both with Langmuir and Freundlich equations. The maximum adsorption capacity ( q m ) of hydrogels derived from Langmuir model for dyes of methylene blue (MB) and rhodamine B (RB) is, respectively, 595.3 and 3078.5 mg g −1 , while for heavy metal ions of Cr 3+ and Cd 2+ is, respectively, 1010.8 and 1191.3 mg g −1 . This research exploits an alternative approach for the rapid preparation of high-efficiency hydrogel adsorbents toward wastewater treatment. Graphical Poly(AA- co -NaAMPS) hydrogels are facile synthesized through frontal polymerization within 10 min. The as-prepared hydrogels display excellent adsorption ability for both dyes and heavy metal ions. The maximum adsorption capacity for dyes of methylene blue and rhodamine B is, respectively, 595.3 and 3078.5 mg g −1 , while for heavy metal ions of Cr 3+ and Cd 2+ is, respectively, 1010.8 and 1191.3 mg g −1 . 相关产品