JOURNAL OF SOLID STATE CHEMISTRY
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2020
·
IF 2.726
Xiao-Cun Liu,Yan-Min Wang,Mei-Li Qi,Ming-Yan Pan
In this paper, we report remarkably improved thermoelectric properties of p-type Ag-rich AgSbSe 2 . Polycrystalline bulk samples of Ag 1+ x Sb 1- x Se 2 (x = 0, 0.01, 0.02, 0.03) were prepared from high purity elements and densified by spark plasma sintering. The X-ray diffraction analysis indicates the formation of solid solution and Ag 2 Se second phase in Ag-rich samples. The existence of Ag 2 Se precipitates is further confirmed by differential scanning calorimetric measurements and scanning electron microscopy images. The increased carrier concentrations combined with the modified band structures lead to the enhanced power factor in Ag 1+ x Sb 1- x Se 2 . Ag 2 Se particles act as phonon scattering centres and reduce the lattice thermal conductivity. This, together with the increased power factor, further enhances the thermoelectric figure of merit ZT . The maximum ZT value at 673 K increases from 0.44 for pristine AgSbSe 2 to 1.02 for Ag 1.02 Sb 0.98 Se 2 , which is more than two times enhancement.
研究领域:
材料科学
·
热电学
·
固体物理
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chaoyang Wang,Shengli Zhu,Yanqin Liang,Chunling Qin,Fang Wang,Hao Wang,Chuntao Chang,Akihisa Inoue
The biomedical field has the potential to significantly benefit from the use of flexible free-standing Ag nanostructures due to their outstanding mechanical and antibacterial properties. However, the intricate process of synthesizing these nanostructures, as well as the potential toxicity of nanostructured Ag, pose significant challenges. This study used a facile etching method to synthesize the free-standing nanoporous Ag (NP-Ag) ribbons with a homogeneous and bicontinuous three-dimensional ligament structure. The free-standing NP-Ag ribbons demonstrated stable mechanical performance and excellent flexibility when subjected to various deformation states on artificial fingers. Additionally, the NP-Ag ribbons exhibited remarkable antibacterial capacity with rates of 99.81 ± 0.14% against Escherichia coli , 96.11 ± 1.49% against Staphylococcus aureus , and 95.37 ± 1.24% against methicillin-resistant Staphylococcus aureus . The antibacterial mechanism of NP-Ag is attributed to the rapid release of Ag ions (Ag + ) in 24 h, causing damage to the bacterial membrane. Moreover, the in vivo results demonstrate that the NP-Ag ribbons provide rapid antibacterial efficacy and are biosafe due to the long-term stable Ag + release of NP-Ag. The development of these free-standing flexible NP-Ag ribbons offers a new avenue for wearable antibacterial applications.
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Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 40
·6931-6938
·
IF 0
Chunlei Zhang,Kan Wang,Chao Li,Yanlei Liu,Hualin Fu,Fei Pan,Daxiang Cui
We studied the cytotoxicity of Ag nanoclusters (Ag NCs) capped by the enantiomers L-glutathione (L-GSH) and D-glutathione (D-GSH) synthesized using the mild reduction agent tetrabutylammonium borohydride. The as-synthesized Ag NCs were characterized by HRTEM and UV-visible, photoluminescence and circular dichroism spectroscopy. The circular dichroism spectra of Ag NCs capped with L-GSH and D-GSH showed multiple bands that were identically mirror-imaged, demonstrating that both the metal core and the ligand contributed to the chirality of the GSH-capped NCs. The properties and potential applications of chiral Ag NCs in enantioselective catalysis and chiral recognition and sensing suggest that a comprehensive evaluation should be made of their potential toxicity. We found that Ag NCs capped with D-GSH (AgNCs@D-GSH) were more toxic to both human gastric cancer MGC-803 cells and human gastric mucous epithelial GES-1 cells than Ag NCs capped with L-GSH (AgNCs@L-GSH). Apoptosis also correlated well with the production of reactive oxygen species, mitochondrial membrane depolarization and G2/M cell phase arrest in a dose- and chirality-dependent manner. The in vivo injection of AgNCs@L-GSH and AgNCs@D-GSH into mice bearing human gastric cancer xenografts led to a significant reduction in tumor size and increased apoptosis. This knowledge is important from the perspective of understanding the interactions between chiral nanoclusters and cells.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Shaopan Bao,Jiaolong Huang,Xiawei Liu,Wei Tang,Tao Fang
Silver nanoparticles (AgNPs) are among the most widely used engineered nanomaterials and may eventually accumulate in sediments. Limited information is currently available regarding the toxicity, bioaccumulation and distribution of sediment-associated AgNPs in aquatic organisms. In the present study, a freshwater snail Bellamya aeruginosa was exposed via sediment to commercial Ag particles of four nominal sizes: 20 nm (AgNPs-20), 40 nm (AgNPs-40), 80 nm (AgNPs-80), and < 10 μm (bulk Ag), and to silver nitrate at sub-lethal concentrations (1, 10 and 100 μg Ag/g sediment). Ag burden and biomarkers of oxidative stress were assessed in different tissues of B . aeruginosa : hepatopancreas, gonad, foot and digestive tracts. All five Ag types were available for uptake by B . aeruginosa when spiked into sediment, and Ag accumulation in different tissues presented the following pattern: hepatopancreas > gonad ≈ digestive tracts > foot. Snails accumulated higher levels of Ag from aqueous Ag than from particulate Ag. In contrast, AgNPs-40 and AgNPs-80 treatments occasionally induced higher oxidative stress than aqueous Ag, indicating the significant role of nanoparticle itself in exerting toxicity. Size-dependent toxicity of AgNPs in sediment was also found, with AgNPs-20 showing lower toxicity than other Ag particles. Overall, this study demonstrated that the toxicity of sediment-associated AgNPs to B . aeruginosa varies with size and differs from aqueous Ag.
研究领域:
环境科学
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毒理学
·
水生生态学
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Journal of Materials Research and Technology-JMR&T
·
2020
·
IF 5.289
Yaya Song,Wenyu Xie,Chao Yang,Dandi Wei,Xintai Su,Li Li,Lu Wang,Jide Wang
Herein, Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 have been prepared via a humic acid-assisted precipitation-calcination process and used as catalysts for the hydrogenation reduction of nitro- and azo-aromatic compounds. The Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) and Raman spectroscopies, UV–vis-NIR diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption analyses. Metallic Ag nanoparticles were in situ generated during the annealing process and spatially confined in the Ag 2 MoO 4 or Ag 2 WO 4 matrix, which effectively inhabited the particle agglomeration of silver. The Ag/Ag 2 MoO 4 and Ag/Ag 2 WO 4 catalysts displayed good performance toward the hydrogenation reduction of 4-nitrophenol, 2-nitroaniline, and rhodamine B in terms of rapid conversion and long term durability.
研究领域:
材料科学
·
催化化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yuanyuan Wang,Yin Zhang,Yuxin Zhang,Xinchen Li,Yancheng Gong,Yingfei Hu,Hangmin Guan
This research details the synthesis of an Ag/Ag₂S/ZnIn₂S₄ composite photocatalyst via the in-situ reduction of Ag/Ag₂S onto a flower-like ZnIn₂S₄ structure. The optimized 2%Ag/Ag₂S/ZnIn₂S₄ material displays augmented visible-light absorption spanning 500–800 nm, a photocurrent density 3.9-fold higher than pristine ZnIn₂S₄, and a more negative flat-band potential of −1.04 V versus Ag/AgCl. This composite achieves over 99% degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) within 15 min (k = 0.2629 min −1 ) and 98.9% degradation of hexachlorobenzene (HCB) within 100 min (k = 0.0408 min −1 ), representing a degradation rate approximately 40 times faster than pure ZnIn₂S₄. To our knowledge, this is the fastest reported case to date of a visible-light-driven reductive dehalogenation reaction involving BDE-47 under similarly mild conditions, and its performance significantly outperforms that of ZnIn₂S₄ modified with Pd, Au, or Cu. Photogenerated electron-mediated mechanisms are confirmed through trapping experiments, and the catalyst exhibits robust stability across five reaction cycles. The accelerated degradation of BDE-47 is ascribed to its lower C Br bond energy (285 kJ/mol) compared to C Cl (327 kJ/mol) and enhanced hydrophobic adsorption. This study introduces a triple-synergy heterojunction approach for achieving ultrafast visible-light-driven reductive dehalogenation of halogenated persistent organic pollutants.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 7
·1-18
·
IF 5.3
Li Xinlou,Wang Ganghui,Wang Haoxiang,Wang Aijia,Guo Hongxu
AgCl/Ag@MOF(Ag) nanocomposites have been successfully fabricated through a simple and quick one-pot reflux approach for the first time, where AgCl/Ag nanoclusters are stabilized on the sheet-like MOF(Ag) surface. The as-prepared Ag-based MOFs fluorescent probe shows high fluorescence intensity and excellent fluorescence stability for sensing of tetracycline antibiotics (TCs) through mechanisms involving inner filter effect (IFE) and static quenching. The experimental results show that the detection concentration ranges for tetracycline (TET), chlortetracycline (CTC), and oxytetracycline (OTC) were 10–80 μM, 10–60 μM, and 10–30 μM, and with the detection limits of 2.59 nM, 1.36 nM, and 1.43 nM, respectively. The high sensitivity and selectivity of the fluorescent probe for TCs offers novel perspectives on utilizing supported MOFs as fluorescent probes for trace TCs detection in food by a fast, simple, and reliable method. Graphical abstract
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yiyao Luo,Huan Liu,Xuhui Xia,Huizhen Fu,Mingyi Guo,Changjun Hou,Danqun Huo
Baijiu plays an essential role in Chinese food culture, but there are still certain limitations in the identification of the aroma type and brand of Baijiu. In this study, based on the Tollen’s reagent, a colorimetric sensor array was constructed for aldehydes and Baijiu discrimination. In the presence of aldehydes or Baijiu, the silver ions (Ag + ) adsorbed by negatively charged nanoparticles can be reduced to elemental silver (Ag 0 ) in situ. Ag 0 deposited on the surface of gold or silver nanopaticle (Au NPs or Ag NPs) leading to the formation of Au@Ag or Ag@Ag core-shell structure which accompanied by a color change. We developed Tollen’s reagent-based sensor array shows the outstanding detection capability in discriminating and quantifying of aldehydes. On this basis, 16 kinds of Baijiu were also identified accurately, the visual results were verified by HCA and LDA models. The colorimetric sensor developed in this study is promising for aroma recognition and brand identification of Baijiu.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-13
·
IF 3.159
Liu Jun,Wu Zhaohui,He Quanguo,Tian Qingyong,Wu Wei,Xiao Xiangheng,Jiang Changzhong
Abstract For an economical use of solar energy, photocatalysts that are sufficiently efficient, stable, and capable of harvesting light are required. Composite heterostructures composed of noble metals and semiconductors exhibited the excellent in catalytic application. Here, 1D Ag/Au/AgCl hollow heterostructures are synthesized by galvanic replacement reaction (GRR) from Ag nanowires (NWs). The catalytic properties of these as-obtained Ag/Au/AgCl hollow heterostructures with different ratios are investigated by reducing 4-nitrophenol (Nip) into 4-aminophenol (Amp) in the presence of NaBH 4 , and the influence of AgCl semiconductor to the catalytic performances of Ag/Au bimetals is also investigated. These hollow heterostructures show the higher catalytic properties than pure Ag NWs, and the AgCl not only act as supporting materials, but the excess AgCl is also the obstacle for contact of Ag/Au bimetals with reactive species. Moreover, the photocatalytic performances of these hollow heterostructures are carried out by degradation of acid orange 7 (AO7) under UV and visible light. These Ag/Au/AgCl hollow heterostructures present the higher photocatalytic activities than pure Ag NWs and commercial TiO 2 (P25), and the Ag/Au bimetals enhance the photocatalytic activity of AgCl semiconductor via the localized surface plasmon resonance (LSPR) and plasmon resonance energy transfer (PRET) mechanisms. The as-synthesized 1D Ag/Au/AgCl hollow heterostructures with multifunction could apply in practical environmental remedy by catalytic manners. Graphical abstract
研究领域:
材料科学
·
催化化学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Bing Li,Fulin Deng,Zheyu Li,Hao Xiong,Shuqu Zhang,Weili Dai,Jie Zhang,Lixia Yang,Jianping Zou,Xubiao Luo
Perovskite oxide, as a promising candidate for volatile organic compounds combustion, is incapable in practical application at present due to its low intrinsic activity resulting from inadequate active oxygen species. However, balancing the concentration of active oxygen species and robust structure for perovskite oxide is still challenging. Herein, an efficient perovskite-based catalyst (denoted as TA-La 0.9 Ag 0.1 MnO 3 ) was constructed through Ag substitution and subsequently tartaric acid etching of LaMnO 3 , which exhibits robustly boosted catalytic performance for toluene combustion compared with pristine LaMnO 3 , causing a ∼100 °C lower T 90 . In this study, Ag substitution could weaken the La-O hybridization, which effectively facilitates La cations removal by subsequent acid etching, thus sufficiently exposing active Ag and Mn species and generating more surface lattice oxygen, but also constructs Ag-Mn-O bridges within the matrix of Ag substituted LaMnO 3 . Acid etching enables the activation of Ag-O-Mn bridges with strong electron transfer ability from O to Ag atom, promoting the mobility of lattice oxygen, and consequently the low-temperature oxidation ability. Additionally, the exposed Ag and Mn as Lewis acid sites can effectively improve the adsorption capacity toward toluene molecules, which synergistically facilitates the toluene abatement. Notably, TA-La 0.9 Ag 0.1 MnO 3 also exhibits superb long-term stability, water-resistance, and high thermal stability up to 650 °C.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 31
·12596-12610
·
IF 4.5
Liu Jun,Wang Hui,Chang Meng-Jie,Li Wen-Juan,Bai Ge,Xie Heng-Xue,Li Xin,Du Hui-Ling,Song Shi-Jie
MIL-100(Fe) has been demonstrated as a commonly used photocatalyst but is limited by the deficient charge separation efficiency and difficult recovery. In this work, by taking advantages of the strong plasmonic absorption and electron conductivity of Ag nanoparticles, as well as the fast magnetic response of the Fe 3 O 4 , core/shell Ag/Fe 3 O 4 @MIL-100(Fe) (AFM) was facilely prepared by a direct hydrothermal reaction between H 3 btc and Ag/Fe 3 O 4 (AF) for photo-Fenton degradation of RhB assisted by H 2 O 2 . Specifically, the Fe 3 O 4 in AF acted as both ion precursor and protector to inhibit Ag aggregation to obtain uniform and dispersed core/shell AFM. By adjusting the MIL-100(Fe) thickness and the Ag proportion, the optimum AFM exhibits superior photo-Fenton activity to decompose 88.5% RhB within 30 min under visible-light irradiation and H 2 O 2 addition, which is much higher than that of AFM in the presence of either light (58.5%) or H 2 O 2 (46.6%) due to the synergistic effects of visible-light absorption by MIL-100(Fe) and ·OH generation from H 2 O 2 . Moreover, the catalyst can be collected conveniently for its strong magnetic responsibility. This work may be beneficial to the development of effective photo-Fenton catalysts. Graphical abstract A novel magnetically recyclable Ag/Fe 3 O 4 @MIL-100(Fe) with special core/shell structure was facilely synthesized by hydrothermal method with superior photo-Fenton activity for dye degradation.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
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