Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Xiaotong Mu,Lihua Chen,Nannan Qu,Min Yin,Shang Wu,Qimeige Hasi,Chaohu Xiao
Solar-powered interface evaporation is considered a promising technology to obtain freshwater from non-potable water by using sustainable solar energy. However, research on combining the photocatalytic effect with solar interfacial evaporation technology to go for photothermal conversion materials with full solar spectrum utilization for photothermal and photodegradation capabilities is still scarce. Due to the unique optical properties of MXene, a novel MXene/Ag 3 PO 4 -based membrane with synergistic photothermal and photocatalytic effects was developed from the perspective of practical applications such as water purification, photodegradation of organic dyes and antibacterial properties. In this paper, polyvinylidene fluoride (PVDF) and carbon black (CB) were used as the substrate, calcium carbonate (CaCO 3 ) and hydrochloric acid (HCl) were selected as the pore-forming agent for hydrophilic modification, and MXene/Ag 3 PO 4 serves as the photocatalyst. The prepared composite polyvinylidene fluoride membrane (PCC-MXene/Ag 3 PO 4 ) with Schottky junction, possesses a rich pore structure, abundant water molecule transport channels, high light absorption ability, and low thermal conductivity, which lead to a good performance in solar interface evaporation, photodegradation and antibacterial. The superhydrophobicity and floatability of the nanosponges in water enable them to continuously pump water, which greatly promotes the dissolution of salt accumulation. With the help of porous nanosponges, PCC-MXene/Ag 3 PO 4 exhibits excellent evaporation stability and salt resistance under 1 kW m −2 solar irradiation, as well as photodegradation of organic dyes. In addition, the PCC-MXene/Ag 3 PO 4 membrane has the properties of self-buoyancy, electrical conductivity, and superior flexibility. Therefore, considering the simple preparation method and fine performances, the PCC-MXene/Ag 3 PO 4 mixed membrane has great application potential in the study of interface evaporation, photodegradation of organic dyes, and antibacterial properties.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Xiangxian Li,Hengfeng Zhu,Xuanru Wei,Quanling Yang,Chuanxi Xiong,Zhuqun Shi
Activated carbon is extensively utilized in blood purification applications. However, its performance has been significantly limited by their poor blood compatibility. In this work, 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCN) and activated carbon (AC) were used to form composite beads by the drop curing method to improve hemocompatibility. The TOCN/AC composite beads had porous surface and exhibited extraordinary adsorption properties. The beads had a high adsorption capacity for creatinine with the optimal adsorption capacity of 83.33 mg g −1 . And the equilibrium adsorption of bilirubin, uric acid and Cu 2+ by TOCN/AC beads was as high as 159.80 mg g −1 , 114.61 mg g −1 and 154.0 mg g −1 , respectively, with a mass ratio of TOCN to AC of 1:4. It is also observed that the adsorption behavior of TOCN/AC beads on creatinine was consistent with the second-order kinetics and Langmuir isothermal model. The hemolysis rate of TOCN/AC was 1.21 %, indicating that TOCN/AC beads had good blood compatibility. The clearance of creatinine toxin in blood by TOCN/AC beads was as high as 87 % within 90 min. Overall, our produced composite beads had great potential for application in the field of blood purification.
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ACS Applied Nano Materials
·
2024
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IF 5.3
Shuang Gao,Xiuyan Deng,Xiaoming Qi,Hongbo Dai,Shao-Yun Fu,Yaqin Fu
High-performance microwave absorption materials with broad electromagnetic absorption bandwidths and scalable architectures have been increasingly demanded in modern electric and telecommunications industries. Herein, we propose a flexible three-dimensional (3D) woven fabric with superior washability and electromagnetic-wave absorption capability using the nanoengineered carbon black (CB)-Fe3O4/polyamide-66 (PA-66) composite fibers that possess a unique core–sheath structure. Notably, the impedance matching and microwave attenuation of the proposed 3D fabric absorbers are realized by the dielectric–magnetic coupling effect of nanometer-sized CB and Fe3O4 nanoparticles within the constituent PA-66 fibers. The produced 3D fabrics showed superior mechanical properties with a tensile strength of 35 MPa, good softness with flexibility of drape coefficient up to 88.8%, and great air permeability with an air permeability of over 109 mm/s. At a weft density of 250 picks/10 cm, the fabric realized the best electromagnetic-wave absorption performance with a minimum reflection loss of −34.5 dB, owing to the good impedance-matched 3D orthogonal structures and integrated dielectric–magnetic fibrous networks of the 3D fabric. In particular, this performance could be well-maintained even after rinsing five times or folding to two layers. This study can provide a promising route to developing next-generation flexible electromagnetic absorption materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Yingna Wang,Zilong Liu,Yuanpei Lan,Chaoyi Chen,Wei Zhang
The removal of small amounts of phenylacetylene from styrene is a crucial step in the production of high-quality styrene feedstocks. In the presence of a large amount of styrene and a small amount of phenylacetylene, achieving and maintaining high selectivity of styrene remains a significant challenge. In this work, a catalyst denoted as Pd 1.25 -Fe-N-C/VC was designed and synthesized with remarkably low Pd loading (the actual Pd content was 0.96 wt%). The catalyst exhibited a satisfactory selectivity for styrene (>95 %) and maintained high selectivity levels (>90 %) in the semi-hydrogenation of phenylacetylene even with prolonged reaction time. Pd nanoparticles (NPs) were well distributed and securely anchored onto the Fe-N-C/VC support with a hierarchical mesoporous structure, which obtained from the pyrolysis of a hexagonal star-like Fe-doped zeolitic imidazolate framework with vitamin C surfactant (Fe-doped ZIF/VC). The remarkable catalytic properties may be partly ascribed to the effective synergy effect of the uniformly well-dispersed Fe-N x (x represents the coordination number) with Pd active centers, which could modulate the adsorption kinetics of the reactant alkynes and alkenes and thus enhancing the selectivity towards styrene. Meanwhile, the hierarchical mesoporous structure is beneficial for the mass transfer, which can effectively promote the interactions between the reactants and active centers. Possible mechanism for the selective hydrogenation of phenylacetylene catalyzed by Pd 1.25 -Fe-N-C/VC was also illustrated. Moreover, the Pd 1.25 -Fe-N-C/VC catalyst exhibited sustained catalytic activity and selectivity even after four continuous cycle tests, showing notable reusability and stability. This work may offer a promising approach for creating highly efficient Pd-based catalysts with remarkably low Pd loading for phenylacetylene semi-hydrogenation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Xin Wu,Chunzhi Cui,Xingzhong Zhu,Caixia Kan
Hybrid noble-metal nanostructures , which integrate plasmonic characteristics and electrocatalytic performance, have garnered significant interest recently. In this study, Au@Pd nanostars were synthesized and employed as an advanced electrocatalyst for the ethanol oxidation reaction (EOR), which suffers from the kinetic limitations of the anodic half-reaction of direct ethanol fuel cells. Leveraging the superior surface plasmon resonance (SPR) property of Au nanostars, the synthesized Au@Pd nanostars exhibited superior plasmon-enhanced EOR activity of 4191.63 A g −1 under laser illumination , noting a 9.40-fold increase compared to dark conditions (445.99 A g −1 ). The influences of Pd loading and laser power on EOR activity were explored. The impact of Pd loading on EOR activity demonstrates a volcano-shaped correlation, where optimal Pd coverage enhances catalysis but excessive amounts dampen SPR performance, crucial for maximizing EOR activity. Within a specified range, EOR activity linearly increases with laser power due to its influence on SPR performance. Mechanistic investigation suggests the critical roles of photothermal effect and hot carriers’ separation in boosting EOR kinetics. The repeated experiments show little difference, ensuring the accuracy and reproducibility of the reported activity of Au@Pd nanostars for EOR. During the long-term stability estimation, the Au@Pd nanostars display the best durability over three electrocatalysts. Overall, our findings highlight the potential of plasmon-enhanced catalysis in advancing the performance of electrocatalysts for EOR and other conventional electrocatalytic reactions.
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ADVANCED MATERIALS
·
2024
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IF 27.4
Xiaojun He,Ya Lv,Yanling Lin,Hong Yu,Yipiao Zhang,Yuhua Tong,Chunwu Zhang
Given the challenge of multidrug resistance in antibiotics, non-antibiotic-dependent antibacterial strategies show promise for anti-infective therapy. V 2 C MXene-based nanomaterials have demonstrated strong biocompatibility and photothermal conversion efficiency (PCE) for photothermal therapy (PTT). However, the limitation of V 2 C MXene's laser irradiation to the near-infrared region I (NIR-I) restricts tissue penetration, making it difficult to achieve complete bacterial eradication with single-effect therapeutic strategies. To address this, Pt nanoparticles (Pt NPs) were attached to V 2 C, forming artificial nanoplatforms (Pt@V 2 C). Pt@V 2 C exhibited enhanced PCE (59.6%) and a longer irradiation laser (NIR-II) due to the surface plasmon resonance effect of Pt NPs and V 2 C. Notably, Pt@V 2 C displayed dual enzyme-like activity with chemodynamic therapy (CDT) and NIR-II enhanced dual enzyme-like activity. The biocatalytic mechanism of Pt@V 2 C was elucidated using density functional theory. In an in vivo animal model, Pt@V 2 C effectively eliminated methicillin-resistant Staphylococcus aureus from deep-seated tissues in subcutaneous abscesses and bacterial keratitis environments, accelerating abscess resolution and promoting wound and cornea healing through the synergistic effects of PTT/CDT. Transcriptomic analysis revealed that Pt@V 2 C targeted inflammatory pathways, providing insight into its therapeutic mechanism. This study presents a promising therapeutic approach involving hyperthermia-amplified biocatalysis with Pt NPs and MXene nanocomposites. This article is protected by copyright. All rights reserved
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
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IF 6.2
Huan Guo,Bingzhu Wang,Ruifeng Li,Xiaohu Li,Jixiang Dai,Yongzhong Zhao,Jianjun Sha
Aiming at the high sintering temperature and densification difficulty in ultrahigh-temperature ceramics, the low-temperature facial and fast preparation of ultrahigh-temperature multi-phases (Hf, Ta)B 2 -(Hf, Ta)C-SiC solid solution ceramics was realized using in-situ reaction combined with hot pressing, where the HfSi 2 , TaSi 2 , B 4 C and C were used as raw materials. The effect of Hf/Ta molar ratio on the microstructural evolution and mechanical properties of ultrahigh-temperature multi-phases ceramics was investigated. The results found that the in-situ reaction and the formation of solid solution phase could promote the densification process. On the other hand, the addition of Ta element induced the formation of high aspect ratio grains with an interlock structure within the ceramic matrix and significantly improved the mechanical properties. When the Hf/Ta molar ratio was 7/3, the multi-phases ceramics exhibited the best mechanical properties, with a hardness of 25.59 GPa, a flexural strength of 556.61 MPa, and a fracture toughness of 5.13 MPa·m 1/2 . The enhanced mechanical properties were attributed to the synergistic effect of multiple strengthening and toughening mechanism, including grain bridging, crack bifurcation and grain pullout induced by high aspect ratio (Hf, Ta)B 2 grains.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Haiyong He,Mingchan Ma,Zhengfei Chen,George Z. Chen,Di Hu
Non-lignin-rich biomass has abundant reserves but remains underutilised as a sustainable carbon source for producing functional carbon materials in energy storage applications. The primary challenge is to develop an efficient and sustainable process to convert these resources into high-performance carbon as electrode active material for supercapacitors. To address this issue, a facile, low-cost molten base carbonisation and activation (MBCA) process is investigated to convert wet Radish (a non-lignin–rich biomass) into hierarchical porous carbon via a single thermal stage. This approach integrates carbonisation, in-situ activation, and heteroatom retention, yielding carbon with a specific surface area of 1172 m 2 g −1 , ultramicropores (0–0.7 nm), partial graphitic structure and nitrogen/oxygen-rich functional groups. The optimised carbon, obtained at 700 ˚C, as a supercapacitor electrode active material exhibited electrochemical performance, with a specific capacitance of 257F g −1 at 5 mV s −1 and 96F g −1 at 2 A g −1 , alongside remarkable cycle stability (92.6 % capacitance retention over 20,000 cycles) and low self voltage decay over 50 h. These results highlight the MBCA process as a viable solution for converting non-lignin-rich biomass into high-performance carbon materials, offering a practical and sustainable alternative for energy storage applications while mitigating environmental pollution from biomass decomposition.
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CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Shuaiqian Wang,Baoji Miao,Muhammad Shahid Nadeem,Huaizhi He,Yao Zhao,Muhammad Yasir,Qiuling Chen,Guoqin Liu,Jinbo Bai
This study successfully prepared a novel high-entropy MAX phase (Ti 1/4 V 1/4 Zr 1/4 Nb 1/4 ) 2 AlC and conducted a comprehensive investigation of its microwave absorption performance. The material was synthesized using a pressure less sintering method, and by optimizing the selection of raw materials and synthesis processes, high purity, and excellent microwave absorption performance were achieved. The composition, structure, morphology, and electromagnetic parameters of the material were analyzed in detail using characterization methods such as XRD, SEM, EDS, TEM, XPS, and vector network analyzer (VNA). Experimental results exhibit that (Ti 1/4 V 1/4 Zr 1/4 Nb 1/4 ) 2 AlC can achieve a lowest RL of -62.56 dB at a thickness of 2.25 mm with frequency of 13.26 GHz, demonstrating outstanding microwave absorption capabilities. The study also explored the microwave absorption mechanisms of grown material, including conductivity, dipole polarization relaxation processes, internal lattice defects, and magnetic loss. This research not only delivers new approaches and development of effective microwave absorption materials but also lays the foundation for subsequent studies on MXene and more multi-element high-entropy MAX phase materials.
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MOLECULES
·
2024
·Vol. 29
·期 16
·3862
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IF 4.2
Guangyue Shi,Xiaolei Sun,Yao Liu
Percolating composites exhibiting negative permittivity have garnered considerable attention due to their promising applications in the realm of electromagnetic shielding, innovative capacitance devices, coil-less inductors, etc. Nano carbon powder/polyvinylidene fluoride (CP/PVDF) percolating composites were fabricated that exhibit Drude-type negative-permittivity behavior upon reaching the CP percolation threshold. This phenomenon is attributed to the formation of a plasmonic state within the interconnected CP network, enabling the delocalization of electrons under the alternating electric field. Furthermore, a significant (nearly two orders of magnitude) increase in the conductivity of sample is observed at a CP content of 12.5 wt%. This abrupt change coincides with the percolation phenomenon, suggesting a transition in the conduction mechanism. To elucidate this behavior, comprehensive analyses of the phase composition, microstructure, AC conductivity, and relative permittivity were performed. Additionally, the sample containing 5 wt% CP exhibits a remarkably high permittivity of 31.5, accompanied by a relatively low dielectric loss (tanδ < 0.2). The findings expand the potential applications of PVDF, while the fabricated percolating composites hold promise for electromagnetic shielding, antennas, and other electromagnetic devices.
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Surfaces and Interfaces
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2025
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IF 6.3
Junjing Li,Xu Liu,Zilin Tan,Liang Wang
In order to enhance the catalytic activity of Pd nanoparticles and reduce the amount of Pd, the present study was carried out to construct nanowire structures by surfactant-directed hydration method to further increase the active sites on the surface of Pd and improve the yield of atomic hydrogen (H ⁎ ). The introduction of cheap metal Ni effectively reduced the Pd dosage and increased the utilization of Pd. Nitrogen-doped ordered mesoporous carbon (NOMC) was incorporated to facilitate the dispersion of Pd particles and improve the stability of the catalyst while ensuring the catalytic activity. The prepared palladium-nickel nanowires/nitrogen-doped ordered mesoporous carbon/carbon (Pd-Ni NWs/NOMC/C) electrodes showed excellent efficiency for the removal of halogenated pharmaceuticals and personal care products (PPCPs). The combination of palladium-nickel nanowires (Pd-Ni NWs) with NOMC enhanced the electron transfer capability at the electrode surface and improved the H ⁎ yield. The results showed that the removal efficiency of this electrode for lornoxicam reached 97.2 % at 270 min. The electrode reduced the amount of Pd while stabilizing the electrocatalytic effect. The dechlorination mechanism of Pd-Ni NWs/NOMC/C electrode for lornoxicam was also proposed, and the reaction products and their toxicity were analyzed. This study provided a new idea for designing and synthesizing metal composite catalysts, reduced the cost of catalyst preparation, and had a good application prospect in the treatment of wastewater containing halogenated organic compounds.
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GREEN CHEMISTRY
·
2024
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IF 9.3
Hao Huang,Guangping Zhou,Min Zhuang,Xiaolan Cai,Shaoqu Xie
Bioenergy is a key strategy for sustainability, yet the potential for biofuel production from chitin is under-exploited. Here, we report the cleavage of the inherently inert σ-type C-C bonds in chitin under the condition of initially breaking the unstable C-O bonds. Mechanistic studies indicate that by regulating the valence state of Ru and the interaction between RuOx and AC-HNO3-melamine, the ability of Ru nanoparticles to cleave C-C and C-O bonds can be controlled. One-pot sequential hydrogenolysis of chitin with RuOx/AC-HNO3-melamine resulted in a mixed alcohol yield 1.66 times that of commercial Ru/C. A mixed alcohol yield of 16.8% was achieved using raw chitin and green process conditions. We expanded the substrate range to include chitosan, N-acetyl-D-glucosamine, and glucosamine. This work demonstrates the potential of marine biomass to produce affordable clean energy.
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