TRANSITION METAL CHEMISTRY
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2024
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IF 1.6
Han Tianhang,Yao Kaisheng,Wang Zixu,Li Han,Zhao Haili
Nitroaromatic compounds are common toxic matters discharged as wastewater in varied industries. Reducing them into corresponding aromatic amines can not only decrease their contamination but also obtain value-added products, in which the preparation of catalysts with superior properties is the key. Herein, the spherical Cu-Ag architectures (ATs) are constructed via a two-step wet chemical method. First, the Cu microspheres are fabricated with the assistance of polyvinylpyrrolidone (PVP) in the mixed solution of ethylene glycol (EG) and water. Then, using them as templates, the spherical Cu-Ag ATs can be grown and constructed. The as-obtained Cu-Ag ATs have the spherical outlines assembled by many nanoparticles. The sliced Cu-Ag ATs show hollow structures and many nanothorns grow from the center to the around, combining the roughly spherical shell to build up the Cu-Ag ATs. In the reduction reaction of p -nitrophenol and p -nitroaniline, the spherical Cu-Ag ATs all exhibit excellent catalytic activities. Within 85 s and 80 s, the p -nitrophenol and p -nitroaniline can be converted completely. The prepared Cu-Ag ATs are expected to have potentials in other fields, such as electronics, sensors and so on. Graphical abstract The hierarchical Cu-Ag architectures are constructed successfully through a two-step wet chemical method, in which the rough Cu microspheres are first fabricated in aqueous EG solution, and are used as templates to direct the growth of Cu-Ag architectures. In both reduction of p -nitrophenol and p -nitroaniline, the Cu-Ag architectures exhibit high catalytic activities.
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JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Xiaohui Ju,Hong Gao,Chen Wang,Runtian Li,Wenqi Zhang,Hongjun Ji,Xiao Xiao,Weixing Li,Yujia Tong
A novel nanofiltration (NF) membrane is developed for efficiently separating monosaccharide from disaccharide. A hydrophilic catechol (CT)-Ag interlayer is proposed and co-deposited on a polyacrylonitrile (PAN) substrate, and then interfacial polymerization (IP) of polyethyleneimine (PEI) and trimethyl chloride (TMC) is carried out. The silver nanoparticles obtained through the reduction reaction are used to precisely regulate the unique selective structure with quinone aggregates and polyamides. The composite NF membrane achieved a pure water flux of 31.2 L m −2 h −1 at 0.5 MPa with 81.2 % sucrose rejection and 17.5 % glucose rejection. Performance evaluation in dyes, proteins, and bacteria systems also showcased the great performance of the membrane. Following the filtration of methyl orange and BSA, the flux recovery rates of the PAN/CT-Ag interlayer/PEI + TMC membrane reached 98.7 % and 98.1 %, respectively. The designed structure of silver nanoparticles in membrane enhances the anti-fouling properties through interactions with bacterial proteins. The developed membrane shows promising potential for glucose purification.
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ACS Sensors
·
2024
·
IF 8.2
Huimin Yang,Zhenming Du,Yazhou Yang,Qirui Wu,Chaofan Ma,Huiyu Su,Xiaoxia Wang,Dawen Zeng
Developing gas sensors capable of efficiently detecting harmful gases is urgent to protect the human environment. Here, an active Ce–Ag bimetallic pair was innovatively introduced into SnS2, which successfully exhibited excellent NO2 gas sensing performance. 0.8% Ce–SnS2–Ag showed a gas sensing response of 5.18 to 1 ppm of NO2 at a low temperature of 80 °C, with a lower limit of detection as low as 100 ppb. DFT calculations revealed that Ce atoms are substituted into the main lattice of SnS2, which opens up the interlayer spacing and serves as an anchor point to fix the Ag atoms in the interlayer. The Ce–Ag bimetallic pairs successfully modulate the electronic structure of SnS2, which promotes the adsorption and charge transfer between NO2 and Ce–SnS2–Ag and thus achieves such an outstanding gas sensing performance. This work opens an avenue for the rational functional modification of SnS2 with an optimized electronic structure and enhanced gas sensing.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jinrong He,Wei Qu,Yun Feng,Jinrui Jiang,Jiaming Luo,Yuzhang Wu,Limin Peng
Melamine-impregnated paper, a decorative material in furniture and interior design, could potentially impede the spread of indoor bacteria if it possesses antibacterial properties. Here, nano Ag-doped ZIF-8 (Ag@ZIF-8) was synthesized using ion exchange and in-situ chemical reduction strategies, followed by incorporating it into melamine-impregnated paper. The ion exchange mechanism of Zn 2+ and Ag + during ion exchange reactions was investigated. The structure of Ag@ZIF-8 was well-defined, with Ag nanoparticles evenly distributed on the surface of ZIF-8. Ag@ZIF-8 showed good thermal stability at 400 °C, meeting the requirements for the hot-pressing process of the melamine-impregnated paper. Ag@ZIF-8 exhibited enhanced ROS generation under visible light compare to ZIF-8, which was attributed to its reinforced light absorption and charge carrier separation facilitated by the localized surface plasmon resonance (LSPR) effect. The antibacterial activity of Ag@ZIF-8 was better than ZIF-8, owing to the multiple-synergistic antibacterial mechanisms of the ion release and ROS generation. Specifically, the 10-Ag@ZIF-8 exhibited MIC of 128 μg/mL and 64 μg/mL against E. coli and S. aureus , respectively. The signal intensity of •O 2 − induced by 10-Ag@ZIF-8 was 4.38 times higher than that of ZIF-8. As the addition of Ag@ZIF-8 increased, the antibacterial performance of melamine-impregnated paper improved. Considering the antibacterial property and economy of melamine-impregnated paper, 0.20 wt% was the optimal amount for 10-Ag@ZIF-8 decorated blockboard. This study proposes a novel approach for synthesizing MOF-based melamine-impregnated paper with antibacterial properties, aiming to reduce bacterial spread, minimize disease risks, and contribute to lowering overall healthcare costs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xue Zhang,Xueqiao Li,Huiling Zhang,Shasha Jiang,Mingze Sun,Tao He,Tao Zhang,Wenna Wu
Packaging materials with peculiar antibacterial properties can shield off and inhibit microorganism proliferation, thus achieving packaging goals such as fresh-keeping, good hygiene, and biosafety. Especially, antibacterial films made of biocompatible substances have received wide attentions, which could effectively extend the shelf life, enhance food security, and guarantee economic benefits. Herein, a self-supporting hybrid antibacterial film was prepared based on non-covalently linked choline hydroxide (ChOH) and alginic acid (HAlg). Then tannic acid (TA) and silver ions were added to improve the mechanical and antimicrobial properties of this hybrid film. The rich hydroxyl groups from TA not only form multiple hydrogen bonds with ChAlg, but can also in situ reduce silver ions to silver nanoparticles, which were confirmed with various characterizations. In addition, the quantitative antibacterial test also proved that the antibacterial rate was significantly improved after adding silver ions, reaching >60 %. In an actual storage test, we found that choline cation (Ch + ) captured in antibacterial film by electrostatic interaction could achieve sustained release, i.e. sustainable bacteriostasis, and keep strawberries fresh for 48 h at room temperature. This work offers a new strategy for preparing antibacterial films via non-covalent weak interactions, explored an alternative antibacterial film for food packaging applications.
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FOOD CHEMISTRY
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2024
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IF 8.5
Xuan Fu,Limei Yin,Yang Zhang,Ruiyun Zhou,Hesham R. El-Seedi,Xiaobo Zou,Yunyun Gong,Zhiming Guo
Aflatoxin B1 (AFB1) is a prevalent contaminant in maize, posing significant threats to human health. This study designed Au Ag Janus NPs with intrinsic Raman signals as signal probes and SiO 2 @AgNPs as capture probes. The two were coupled through complementary base pairing to ensure the ordered, controlled distribution of noble metal nanoparticles. The Au Ag Janus NPs and the highly stable SiO 2 carrier is expected to avoid the adverse effects on stability caused by using signal molecules and the formation of random aggregates when using the noble metal nanoparticle gap effect to concentrate on the electromagnetic field. This study improved the negative impact of AgNPs' high surface energy on their uniformity, while enhancing the pH adaptability of Au Ag Janus NPs. In the presence of AFB1, the composite disintegrates, and the SERS intensity showed a negative correlation with AFB1 concentration, enabling highly sensitive and stable detection of AFB1.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·Vol. 51
·期 4
·2071-2088
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IF 3.5
Wu Yilin,Li Yiping,Zhang Kai,Hu Jinhai,Yan Hong
Photocatalytic CO 2 reduction technology can use sunlight to convert CO 2 into fuel or chemical raw materials, slowdown the greenhouse effect and achieve sustainable development. Therefore, we have developed a series of high-quality carbon quantum dots using alkaline lignin (AL) as the core raw material and using high efficiency hydrothermal method. Ag-BiVO 4 composite was prepared by hydrothermal method. Then, the Ag-BiVO 4 -CQDs photocatalytic composite was prepared by constant temperature water bath method. The structure and morphology of the composites were characterized by X-ray diffraction, transmission electron microscope and X-ray photoelectron spectroscopy. Through optical and electrochemical tests, it can be seen that the composite has better interfacial charge transfer and electron transport ability. In the visible light catalytic CO 2 reduction reaction, Ag-BiVO 4 can selectively reduce CO 2 to CH 4 , and the CH 4 yield is greatly improved after Ag-BiVO 4 combines with CQDs. The 3 h CH 4 yield increased from 17.64 μmol/g to 97.82 μmol/g after reduction by adding 40 mL CQDs to Ag-BiVO 4 composite, which is 5.54 times that of Ag-BiVO 4 . The results showed that the introduced CQDs were uniformly attached to Ag-BiVO 4 . As an electron transport medium, CQDs can efficiently facilitate the transfer of photogenerated carriers, suppress the recombination of electron–hole pairs, and enhance the photocatalytic performance of Ag-BiVO 4 -CQDs for CO 2 reduction.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Ye Xu,Qiyuan Gui,Xiaoling Peng,Jing Li,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
This study reports on the synthesis and electromagnetic wave-absorbing properties of Ag/Fe 3 O 4 /SiO 2 under various magnetic field intensities. The nanocomposites were prepared via a solvothermal method followed by a Stober proces, during which uniform magnetic fields were applied to induce the formation of one-dimensional nanochain structures. Results indicate that the Ag/Fe 3 O 4 /SiO 2 exhibit enhanced wave-absorbing capabilities under strong magnetic fields. Specifically, at a magnetic field of 600 mT, the composite achieves a minimum reflection loss value of −48.61 dB, accompanied by a broad effective absorption bandwidth. Furthermore, the microwave absorption performance of samples oriented horizontally along the circumference surface during preparation shows a significant improvement compared to non-oriented samples. It is attributed to the optimized electromagnetic wave transmission pathways and improved electrical conductivity and magnetic loss capabilities facilitated by the nanochain structures. Specifically, the nanochains effectively lengthen the wave propagation distance, promote charge migration, and intensify natural and exchange resonance effects. This research not only broadens the design paradigm for electromagnetic wave-absorbing materials but also offers novel strategies for their development.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Jinyang Wang,Yue Feng,Huiliang Zhang,Longhao Han,Jin Xia,Guangjian Wang
The surface-enhanced Raman scattering (SERS) technique provides a quick and reliable method for detecting pesticide residues. In this study, flexible substrates, composed of orderly arranged silver nanospheres (Ag NPs) films on graphene paper, were fabricated through a simple, low-cost Ag NP self-assembly process at a liquid–liquid interface, followed by transfer of the films onto the graphene paper. The SERS performance of the fabricated substrates was evaluated using a portable Raman spectrometer, with rhodamine 6G (R6G) serving as the probe molecule. The results indicate that the bilayer Ag NP films-covered graphene paper exhibits optimal overall performance, characterized by high sensitivity and high uniformity. The limit of detection (LOD) for the R6G molecule is as low as 8.73 × 10 −9 M, demonstrating the strong signal amplification capability of the SERS substrate. Moreover, the relative standard deviation (RSD) of the Raman intensity at 1508 cm −1 for different selected points on the substrate is 5.018 %, indicating high uniformity of the SERS substrate. Finally, the performance of the SERS substrate was further evaluated by detecting thiram in fresh orange juice, demonstrating the capability to detect concentrations as low as 10 −6 M. This result highlights the significant potential of the developed SERS substrate for practical applications in food safety and quality control.
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Energy Storage Materials
·
2025
·
IF 20.2
Siyu Fang,Tiansheng Bai,Jialin Liao,Shuai Zhang,Jiaxian Wang,Funian Mo,Wei Zhai,Zhenglin Hu,Jingyu Lu,Kwun Nam Hui,Lijie Ci,Deping Li
Lithium metal anodes hold the potential for high-energy-density batteries due to their substantial theoretical capacity, but their practical application is hindered by issues such as dendrite growth, poor cycling stability, and safety concerns. This study presents the development of a three-dimensional Li-Si composite alloy anode (Ag@Cu@Li-Si), combining a porous copper scaffold with a lithiophilic silver (Ag) layer and a lithium-silicon (Li-Si) alloy. The Ag@Cu@Li-Si composite demonstrates significant improvements in dendrite suppression, cycling stability, and electrochemical performance. The composite anode exhibits a critical current density of 15 mA cm −2 and over 900 hours of stable operation at 1.0 mA cm −2 in symmetric cells. When integrated into a full cell with a commercial LiFePO 4 cathode, it maintains excellent cycling stability, delivering over 600 cycles with a rate capability of 1.0 C. This study provides valuable insights into the design of lithium metal anodes, highlighting the importance of lithiophilic materials and 3D frameworks for high-performance lithium-metal batteries.
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ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Mengdi Li,Shiqiang Ouyang,Yichi Liu,Yiting Wu,Zihan Hu,Feijie Wang,Shufeng Ma,Liqiang Wang
In recent years, MXene has attracted significant attention for electromagnetic interference (EMI) shielding due to its unique layered structure and excellent conductivity. However, its mechanical limitations pose challenges for practical implementation. In this study, a lightweight, anisotropic MXene@Ag/wood aerogel composite is fabricated by integrating MXene with silver nanoparticles and loading it onto the cellulose framework of wood aerogels (WAs). The WAs are derived from natural wood through an eco-friendly delignification process. The composite leverages the 3D porous structure of natural wood and the high conductivity of MXene, while the incorporation of silver nanoparticles further enhances its EMI shielding performance, achieving a shielding effectiveness of up to 71.15 dB. It also exhibits a desirable low density of 0.065 g cm − 3 and high SSE/t value of 4904.75 dB cm 2 g −1 , demonstrating excellent lightweight properties. Its anisotropic structure results in direction-dependent shielding, which can be adjusted by material orientation, offering flexibility for diverse applications. Moreover, strong triboelectric nanogenerator output highlights its potential in flexible electronics. This composite holds promising applications in high-frequency circuits, communication systems, and aerospace, reducing EMI interference and enhancing system stability and safety. This study introduces a new strategy for developing lightweight, efficient EMI shielding materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yiming Zhang,Yunpeng Zhang,Hongzhi Liu,Zhenggang An,Jiakai Hu,Xiaogang Hou,Peisen Li,Xusheng Wang
Suppressing photoinduced charge recombination represents a critical challenge in photocatalytic ammonia (NH 3 ) decomposition for hydrogen (H 2 ) production. Herein, we propose a dual-cocatalyst system comprising plasmonic silver (Ag) and nickel oxide (NiO), which synergistically construct an Ag → titanium dioxide (TiO 2 ) → NiO directional electron cascade on TiO 2 surfaces through work-function-induced interfacial charge transfer. The optimized 3 %Ag-1 %NiO-TiO 2 reaches a significantly photocatalytic H 2 production rate of 2366.9 μmol/h/g from NH 3 splitting, which is 20.7, 2.1 and 1.5 folds higher than that of pristine TiO 2 (114.4 μmol/h/g), 1 %NiO-TiO 2 (1146.7 μmol/h/g) and 3 %Ag-TiO 2 (1534.1 μmol/h/g), respectively. Photoelectric characterizations confirm accelerated charge separation and transfer dynamics through synergistic interplay of NiO and Ag cocatalysts on TiO 2 . Density functional theory (DFT) calculations reveal that work function gradient among TiO 2 , NiO and Ag facilitates unidirectional electron flow from Ag to NiO through the TiO 2 bridge. The optimal nickel (Ni) d-band center position and the reduced potential-determining step energy barrier for NH 3 splitting on 3 %Ag-1 %NiO-TiO 2 are further identified as key factors governing its outstanding H 2 evolution performance. This work establishes a rational dual-cocatalyst design with unidirectional electron flow to enable efficient photocatalytic H 2 production from NH 3 splitting.
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