NEW JOURNAL OF CHEMISTRY
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2025
·
IF 2.5
Yang Yang,Mengyao Tan,Xiaoman Li,Min Luo
The photocatalytic nitrogen reduction reaction provides an alternative process for nitrogen cycling and ammonia (NH3) production under mild conditions. Herein, we have synthesized Ag-loaded In2O3 (Ag@In2O3-X) by solvothermal and photoreduction methods. The introduction of Ag significantly alters the band structure of In2O3, resulting in a slight reduction in the band gap and a more negative conduction band position, thereby facilitating the generation of reductive electrons in In2O3. Moreover, the synergistic interaction between loaded Ag nanoparticles and In2O3 forms a Schottky barrier, which widens the light absorption range and promotes charge separation. Under simulated sunlight, the photocatalytic nitrogen fixation performance of Ag@In2O3-5 reaches 35.56 μmol h−1 gcat−1, which is higher than other composites and 3.58 times that of pure In2O3. At the same time, the catalyst has good structural stability and cycle life. Density functional theory (DFT) calculations demonstrate that Ag exhibits a stronger interaction with N2 and lowers the potential barrier of the N2 hydrogenation reaction. The synergistic effect between precious metals and semiconductors offers novel insights and presents challenges for the photocatalytic N2 fixation process. This work provides new insights and challenges for designing and synthesizing nanomaterials for photocatalytic nitrogen fixation.
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Polymers
·
2024
·Vol. 16
·期 8
·1173
·
IF 4.7
Yunkai Wang,Danlei Jing,Zikai Xiong,Yongqing Hu,Wei Li,Haotian Wu,Chuan Zuo
With the development of microelectronics products with high density and high power, it is urgent to improve the electrical and thermal conductivity of electronic paste to achieve the new requirements of packaging materials. In this work, a new synthesis method of Ag-MWCNTs was designed: Firstly, carboxylated MWCNTs and stannous chloride were used as raw materials to prepare high-loading-rate Sn-MWCNT composite material to ensure the high loading rate of metal on the MWCNT surface. Then, Ag-MWCNT composite material was prepared by the chemical displacement method to solve the problem of the low loading rate of silver nanoparticles on the MWCNT surface. On the basis of this innovation, we analyzed and compared the electrical, thermal, and mechanical properties of Ag-MWCNT composite electronic paste. Compared with the electronic paste without adding Ag-MWCNTs, the resistivity was reduced by 77%, the thermal conductivity was increased by 66%, and the shear strength was increased by 15%. Therefore, the addition of Ag-MWCNTs effectively improves the electrical, thermal, and mechanical properties of the paste, making it a promising and competitive choice for new packaging materials in the future.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huanliang Liu,Wenqing Lai,Yue Shi,Lei Tian,Kang Li,Liping Bian,Zhuge Xi,Bencheng Lin
Bacteria in air harm the human body. Therefore, developing novel materials capable of simultaneously filtering and terminating bacteria is highly desirable. However, the filtration and inhibition performance of existing filters remain far from optimal. In this study, we combine the electrospinning technique with an in situ reduction approach to fabricate electrospun composite fibrous membranes for simultaneous bacterial filtration and termination. The results show that composite membranes with a homogenously fibrous morphology are successfully prepared. Furthermore, the dual antibacterial agents silver nanoparticles (Ag) and graphene oxide nanosheets (GO) are uniformly encapsulated within the fibers. The tensile strength and elastic modulus of the electrospun composite membranes reach 1.04 and 10.23 MPa, respectively. In addition, the results show that the composite membranes exhibit excellent interception efficiency of over 99.9 % against the gram-positive bacteria S. aureus . The electrospun composite membranes also exhibit high antibacterial activity against E. coli , S. aureus , K. pneumoniae , C. albicans , and B. subtilis, achieving antibacterial efficiency of over 99.99 %. Electrospun composite membranes with bacterial filtration and termination properties may have great potential for use in personal protective equipment and indoor and outdoor air purification.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Lin Fan,Lijun Kong,Hao Liu,Jiawei Zhang,Mengdi Hu,Li Fan,Hongliang Zhu,Shancheng Yan
Ag and Cu based nanostructures serve as advanced functional materials for biomedical applications , due to their unique properties. Here, we proposed a novel neurotransmitter biosensing method based on Ag–Cu composite nanozyme , synthesized through the soft film plate method. Supported by the soft film template , the Ag–Cu nanozymes were stably kept to an ultrafine 2D structure with high monodispersity, which provided a large specific surface area and sufficient binding sites , leading to controllable and improved dual-nanozyme activities over similar-sized mono-Ag and mono-Cu, and up to 4.95 times of natural enzyme-level. The multi-path enzymatic reaction processes catalyzed by Ag–Cu composite nanozymes were firstly theoretically discussed in detail, according to the theoretical redox potential of redox couples in the reaction systems. On this basis, the Ag–Cu filled nanonets based neurotransmitter biosensing is successfully applied in rapid detection for glutathione and dopamine, possessing a linear range of 10∼100 μM and 1–10 μM, and a detection limit of 3.01 μM and 0.29 μM, respectively, which exhibited superior performance for biomedical purposes over most commercially available products in speed and precision.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·848
·
IF 4.4
Jun Wu,Gaofeng Shao,Xiaodong Wu,Sheng Cui,Xiaodong Shen
A novel Cr-doped BaTiO3aerogel was successfully synthesized using a co-gelation technique that involves two metallic alkoxides and a supercritical drying method. This freshly prepared aerogel has a high specific surface area of over 100 m2/g and exhibits improved responsiveness to the simulated sunlight spectrum. Methyl orange (MO) was chosen as the simulated pollutant, and the results reveal that the Cr-doped BaTiO3aerogel, when modified with the noble metal silver (Ag), achieves a pollutant removal rate approximately 3.2 times higher than that of the commercially available P25, reaching up to 92% within 60 min. The excellent photocatalytic performance of the Ag-modified Cr-doped BaTiO3aerogel can be primarily attributed to its extensive specific surface area and three-dimensional porous architecture. Furthermore, the incorporation of Ag nanoparticles effectively suppresses the recombination of photo-generated electrons and holes. Stability and reusability tests have confirmed the reliability of the Ag-modified Cr-doped BaTiO3aerogel. Therefore, this material emerges as a highly promising candidate for the treatment of textile wastewater.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Wang Jingyun,Zhang Lei,Huang Youju,Dandapat Anirban,Dai Liwei,Zhang Ganggang,Lu Xuefei,Zhang Jiawei,Lai Weihua,Chen Tao
The probe materials play a significant role in improving the detection efficiency and sensitivity of lateral-flow immunochromatographic test strip (ICTS). Unlike conventional ICTS assay usually uses single-component, solid gold nanoparticles as labeled probes, in our present study, a bimetallic, hollow Au-Ag nanoparticles (NPs) labeled ICTS was successfully developed for the detection of clenbuterol (CLE). The hollow Au-Ag NPs with different Au/Ag mole ratio and tunable size were synthesized by varying the volume ratio of [HAuCl4]:[Ag NPs] via the galvanic replacement reaction. The surface of hollow Ag-Au NPs was functionalized with 11-mercaptoundecanoic acid (MUA) for further covalently bonded with anti-CLE monoclonal antibody. Overall size of the Au-Ag NPs, size of the holes within individual NPs and also Au/Ag mole ratio have been systematically optimized to amplify both the visual inspection signals and the quantitative data. The sensitivity of optimized hollow Au-Ag NPs probes has been achieved even as low as 2 ppb in a short time (within 15 min), which is superior over the detection performance of conventional test strip using Au NPs. The optimized hollow Au-Ag NPs labeled test strip can be used as an ideal candidate for the rapid screening of CLE in food samples.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xueyan Li,Di Wu,Qingzhi Luo,Rong Yin,Jing An,Sijie Liu,Desong Wang
The novel ternary cyclized polyacrylonitrile (CPAN)/Ag/AgCl composites were successfully synthesized by a facile precipitation and photo-assistant reduction method. The CPAN/Ag/AgCl particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photoluminescence spectroscopy (PL), electrochemical impedance spectra (EIS) and photocurrent time (EI) measurement. The photocatalytic activities of the samples were investigated through the decomposition of methyl orange (MO) and rhodamine B aqueous solution under visible-light irradiation. The results showed that the CPAN/Ag/AgCl photocatalysts displayed much higher visible-light photocatalytic activity than Ag/AgCl, and the reaction rate constant of the MO degradation catalyzed by CPAN/Ag/AgCl is about 3 times of that by Ag/AgCl. It is proposed that the photogenerated holes h + and O 2 − played important roles in the photocatalytic degradation of MO in the presence of CPAN/Ag/AgCl composites under visible light irradiation.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·Vol. 51
·期 4
·2071-2088
·
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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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Yumin Liang,Chenhui Liu,Zhiyu Ma,Jiyun Gao,Yanxin Wu
HKSUT-1 is often used as an adsorbent because of its excellent adsorption properties. In this study, Ag + was impregnated into the HKSUT-1 precursor solution using the impregnation method, with sodium borohydride (NaBH 4 ) serving as the reducing agent. This was done to examine the removal efficiency of NR dye. The Ag-HKSUT-1 composites were prepared by varying the additions of AgNO 3 and NaBH 4 . The morphology and structure of the Ag-HKSUT-1 composites were characterized by TG, FT-IR, BET and TEM. The adsorption performance of AH1 for neutral red dye in wastewater was investigated. The adsorption process was described by the Langmuir model and the pseudo-second-order kinetic model. The adsorption capacity of AH1 for NR dye at 298 K was calculated to be 64.59 mg/g, indicating that Ag-HKUST-1 effectively adsorbed NR dye. The adsorption process is driven by a chemisorption mechanism, where intermolecular forces between Ag-HKUST-1 and NR, electrostatic interactions, and π-π conjugation between benzene rings play key roles. The results enhance our understanding of the surface interactions between Ag-HKUST-1 and NR dyes and broaden the application of HKUST-1 as an adsorbent for pollutant removal in water.
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Coatings
·
2024
·Vol. 14
·期 2
·192
·
IF 2.9
Danye Zuo,Yuhong Yin,Liming Jiang,Zhi Xia,Chong Tan,Junsheng Li,Jinlong Zuo,Yuyang Wang
This study focuses on synthesizing a composite material of Ag/ZnO/BiOCl using Ag, ZnO, and BiOCl as raw materials. The material was prepared by loading Ag and BiOCl onto ZnO nanofilms, aiming to enhance the photocatalytic degradation of ciprofloxacin (CIP). Optimization of the photocatalytic degradation process through single-factor experiments revealed that under conditions of an initial CIP pH of 9, an Ag/ZnO/BiOCl dosage of 1 g/L, and an initial CIP concentration of 5 mg/L the conversion efficiency of CIP reached 98.79% after 150 min of exposure to a 250 W xenon lamp simulating sunlight. Furthermore, the composite material maintained a conversion efficiency of 86.17% for CIP even after five cycles of reuse, demonstrating its excellent stability. The optical properties, elemental composition, valence state, crystallinity, and morphology of the samples were analyzed using techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), UV–visible diffuse reflectance spectroscopy (UV-vis DRS), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results indicate that the introduction of Ag expanded the light response range of ZnO, while the addition of BiOCl improved the separation efficiency of electron–hole pairs in the composite nanomaterial. The photocatalytic mechanism was further elucidated through radical scavenging experiments, confirming that ·OH and h+are the main active species in the degradation process.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Keduo Yan,Lan Xu,Adnan Ahmed
Due to the rapid development of information technology and the trend toward miniaturization of electronic equipment, the research on electromagnetic interference (EMI) shielding materials is rapidly moving toward low-dimensional, core–shell, and lightweight directions, with a wide range of application prospects in various fields. In this study, using pDA as a binder, poly(vinylidene difluoride) (PVDF)/Fe3O4@pDA@Ag nanofiber membranes (NFMs) with a multicore–shell structure were prepared by in situ growth of Ag nanoparticle (NP) layers on the fiber surface of electrospun PVDF/Fe3O4 NFMs fabricated in batch. Compared to PVDF@pDA@Ag NFM, the average EMI shielding efficiency (SE) of PVDF/Fe3O4@pDA@Ag NFM reached 82.31 dB because of the increased hysteresis and multireflection losses inside the NFM caused by the moderate addition of Fe3O4 NPs. In addition, the synergistic effect of Fe3O4 and Ag NPs increased the microwave attenuation and impedance matching of composite NFM, further enhancing its EMI SE.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xiongyi Peng,Jianyu Li,Xujia Cao,Jiarui Zhang,Yongqiang Li,Yufeng Liu
Constructing semiconductor composites composed of multiphase heterojunctions has been considered as an effective strategy for designing promising photocatalyst systems. In this work, a novel ternary heterojunction photocatalyst was prepared by integrating MoS 2 semiconductor nanoflowers with silver doped covalent organic frameworks (COFs) and used for photocatalytic degradation of antibiotics. The regular pore structure and solid skeleton of COFs matrix optimize the distribution of constituent units, making Ag-MoS 2 nanoflower uniform and highly dispersed on the COFs material matrix. Moreover, the silver nanoparticles in the catalyst acted as an electron mediator, which inhibited the recombination of charge carriers, and effectively enhanced the photocatalytic activity of Ag-MoS 2 @COF. The as-prepared Ag-MoS 2 @COF ternary heterojunction photocatalyst exhibited high degradation efficiency for tetracycline (TC), reaching 90.1 % after 50 min of visible light irradiation, which was superior to most heterojunction photocatalysts. The Ag-MoS 2 @COF also demonstrated good reusability, almost maintaining the initial photocatalytic efficiency after 5 cycles. In addition, the plausible direct solid-state Z-scheme photocatalytic mechanism for TC degradation with Ag-MoS 2 @COF ternary catalyst under visible light irradiation was proposed according to LC-MS analysis, radicals trapping experiment and photoelectric chemical test. This work provides a new paradigm for the design and development of COF-based ternary heterojunction photocatalysts for environmental remediation.
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