GEOSTANDARDS AND GEOANALYTICAL RESEARCH
·
2025
·
IF 3.4
Tao He,Hui Cao,Wang Lang,Zhaochu Hu,Zaicong Wang,Zongqi Zou,Wen Zhang,Haihong Chen,Yongsheng Liu
Silver is a powerful geochemical tracer in various geological processes (e.g., hydrothermal deposit formation and evolution of the terrestrial and Martian mantles). The measurement of the ultra-trace Ag (< 0.1 μg g -1 ) in geological samples by ICP-MS is often hindered due to serious polyatomic interferences arising from Zr, Nb and Y elements presented in samples. In this study, a simple and rapid ammonia coprecipitation method was developed to remove interference elements (Zr, Nb and Y) in NH 4 HF 2 digests for the determination of Ag mass fractions in geological materials by isotope dilution ICP-MS (ID-ICP-MS). The removal of interference elements (Zr, Nb and Y) in digestion solutions of geological materials was achieved using ammonia coprecipitation, effectively eliminating their polyatomic interferences. To compensate for the incomplete recovery of Ag during ammonia coprecipitation, isotope dilution calibration was chosen over internal standard calibration to achieve final accurate results. The limit of quantitation for Ag using the proposed method was 1.83 ng g -1 . The results obtained for Ag mass fractionation in nine international geological reference materials were in good agreement with the published values obtained by ID-ICP-MS and ICP-MS/MS. The proposed simple, rapid and practical analytical method for the determination of Ag mass fractions improves our understanding of the behaviour of silver in cosmochemistry and geochemistry studies.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Xiaoyan Yang,Huihui Chai,Lingli Guo,Ying Jiang,Liqun Xu,Wei Huang,Yijun Shen,Ling Yu,Yingshuai Liu,Jing Liu
Poly-ether-ether-ketone (PEEK) is a promising material in oral repair and orthopedic implantation field due to its stability and proper elastic modulus. However, the lack of simple but effective strategy to functionalize PEEK and improve its antibacterial function hinders its further biomedical application. In this study, a sulfonated 3D porous PEEK is fabricated via sulfonation treatment, and then decorated with the in situ synthesized zeolitic imidazolate framework-8 (ZIF-8), in which Ag + ions were loaded with high loading capacity. Surface morphology, roughness, chemical composition and hydrophilicity of all the substrates were evaluated in details, suggesting Ag + ions loaded ZIF-8 on sulfonated PEEK (SPZA) was successfully prepared. The antibacterial activity of pristine and functionalized PEEK was evaluated by inhibition zone test, spread plate assay, growth curve, and morphology of bacteria. Experimental results demonstrate that the SPZA has effectively bacteriostatic performance against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). The excellent antimicrobial activity is attributed to the synergistic effect of Ag + and Zn 2+ ions released continuously from SPZA. This work provides a promising route for surface modification of PEEK and offer a potential candidate for biomedical implants.
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OPTICS EXPRESS
·
2021
·Vol. 30
·期 1
·588-602
·
IF 3.894
Anxin Jiao,Qingqiang Cui,Shuang Li,Yue Tian,Hui Ma,Chang Wang,Mengya Zhang,Ming Chen,Guihua Li,Guihua Li,Xiangdong Liu,Xiangdong Liu
Recently, hybrid plasmonic metal/semiconductor-based surface-enhanced Raman scattering (SERS) has attracted ever-increasing attention due to its combined characteristics of electromagnetic (EM) enhancement and chemical (CM) enhancement, holding great potential for trace molecular detection. Herein, we demonstrate an interesting heterostructure by linking Cu2O nano-octahedrons with intertwined Ag nanovines (NVs). The obtained Ag NVs/Cu2O heterostructures exhibit excellent SERS activity, which is about 2.7 and 7.0 times higher than that of monodispersed Ag or Au nanoparticles (NPs) modified Cu2O. The intertwined Ag NVs among adjacent Cu2O octahedrons serve as efficient electron transport channels, which can obviously promote the separation of electrons and holes, reduce the recombination of photogenerated carriers, and then improve the CM enhancement effect. Meanwhile, the accumulated electrons on plasmonic NVs can effectively optimize the collective oscillation of electrons and further improve the EM enhancement. The optimal SERS substrate possesses fascinating multifunctional SERS properties, including ultra-low detection limit (CV, 10−14 M), excellent anti-interference capability and selectivity. Finally, the established nanosensor can be effectively applied for the quantitative detection of pesticide thiram molecules in soil and biological samples, with low detection limits of 0.48 ng g−1 and 10−7 M, respectively. The proposed work demonstrates a high-performance SERS heterostructure with both improved CM enhancement and enhanced EM effect by linking adjacent Cu2O nano-octahedrons with Ag NVs, which is particularly suitable for ultrasensitive residual pesticide detection in real-world environment.
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RSC Advances
·
2015
·Vol. 5
·期 118
·97648-97657
·
IF 3.84
Cong Wu,Guangmei Xia,Jing Sun,Rui Song
With dopamine as a reducing and sticking agent, triblock copolymer poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO), Pluronic F127, was employed to immobilize and stabilize silver nanoparticles (Ag NPs) by the chemical reduction of silver nitrate, AgNO3. Thus, a ternary system comprising Ag NPs, dopamine and F127, i.e. a Ag@DA@F127 system was constructed. In this ternary system, Ag NPs were anisotropically self-assembled and uniformly dispersed in network-like F127 micelles. As evidenced the dispersion stability of Ag NPs in this system was significantly enhanced compared to the Ag@DA and Ag@NaBH4@F127 system, which in turn resulted in a more sensitive and quantitative detection of H2O2. Further investigation demonstrated that the Ag@DA@F127 system exhibited a UV-vis absorption band at ∼405 nm and the intensity of this absorption band dramatically decreased linearly over the concentration range of 0.1–100 μM H2O2 (r2 = 0.99056), deriving a detection limit of 33 nM, which was superior to recent reports. Apart from its excellent performance in H2O2 detection, this Ag@DA@F127 system has other benefits including facile and simple, being environmentally friendly, and especially the formation of a specific network-like structure to fully disperse Ag NPs, which makes it practical in H2O2 detection.
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WATER RESEARCH
·
2024
·
IF 11.4
Yuyang Yao,Yueyue Lu,Jingwen Xu,Jiacheng Yu,Liang Guo,Heda Ding,Jian Li,Junbin Liao,Edison Huixiang Ang,Zhenlu Shen,Jiangnan Shen
Membrane-contamination during electrodialysis (ED) process is still a non-negligible challenge, while irreversible consumption and unsustainability have become the main bottlenecks limiting the improvement of anion exchange membranes (AEMs) anti-contamination activity. Here, we introduce a novel approach to design AEMs by chemically assembling 4-pyndinepropanol with bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) in an electrochromic-inspired process. Subsequently, the co-mingled TiO 2 @Ag nanosheet with the casting-solution were sprayed onto the surface of the substrate membrane to create a micrometer-thick interfacial layer. The addition of Ag nanoparticles (NPs) enhances the active sites of TiO 2 , resulting in stronger local surface plasmon resonance (LSPR) effects and reducing its energy band gap limitation (From 3.11 to 2.63 eV). Post-electrodialysis electrochromic AEMs incorporating TiO 2 @Ag exhibit synergistic enhancement of sunlight absorption, effectively suppressing photogenerated carrier binding and promoting migration. These resultant-membranes demonstrate significantly improved bacterial inhibition properties (42.0-fold increase for E. coli ) and degradation activity (7.59-fold increase for rhodamine B) compared to pure TiO 2 membranes. Importantly, they maintain photocatalytic activity without compromising salt-separation performance or stability, as the spraying process utilizes the same substrate materials. This approach to rational design and regulation of anti-contamination AEMs offers new insights into the collaborative synergy of color-changing and photocatalytic materials.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Tianna Wu,Shuo Yang,Wei Feng,Kaiyue Li,Yanru Li,Lili Wang,Rui Chen,Xiaodong Yang,Lulu Liu,Donglai Han
Equipped with surface-enhanced Raman scattering (SERS) effect and magnetic manipulation capacity, a new paradigm of recyclable SERS substrates based on Fe 3 O 4 nanoparticles (NPs) @SiO 2 @PEI-DTC adhesive layer @Au-Ag alloy quantum dots (QDs) were successfully prepared via engineering hydrothermal and seed deposition techniques. The SERS performance and uniformity of those substrates with different gold-silver (Au-Ag) weight ratios were evaluated by 4-aminothiophenol (4-ATP) molecules, revealing that the relative standard deviations (RSDs) of all substrates were less than 12 %, with the optimal SERS substrate achieving an enhancement factor (EF) of up to 1.39 × 10 5 . This phenomenon can be attributed to the magnetic core and plasmonic resonance properties of Au-Ag alloy QDs, which result in abundant interparticle hotspots in the Fe 3 O 4 @SiO 2 @PEI-DTC@Au-Ag (FSPAA) nanocomposites. Furthermore, the optimal FSPAA nanocomposite was employed as a SERS substrate for rapid non-destructive detection of thiram on fruit surfaces. The SERS signal intensity exhibited a robust manifesting a linear association with thiram concentration within the span of 1 × 10 −4 to 1 × 10 −9 M, and the minimal detectable concentration was 1.04 × 10 −10 M. The FSPAA core–shell nanocomposites exhibit high reusability and reliability and hold great promise for the practical applications in on-site assessment of food/environmental safety, as well as in spectroscopic identification of molecules adsorbed onto fruit surfaces.
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Analytical Methods
·
2025
·
IF 2.6
Shuxian Ren,Jihong Fu,Guoqi Liu,Haipeng Zhang,Boshen Wang,Junli Yu
The unreasonable use of organic dye leads to excessive residues in environmental water, which seriously threatens human health and the natural environment. In this paper, a spherical flower-like magnetic Fe3O4@CoNi layered double hydroxide@silver nanoparticle (Fe3O4@CoNi LDH@Ag NPs) SERS substrate was successfully fabricated via electrostatic self-assembly and applied for the sensitive detection of methylene blue (MB) in environmental water. The rapid concentration and separation of the SERS substrate from the water sample could be achieved using an external magnet. The Fe3O4@CoNi LDH@Ag NPs could not only rapidly enrich the trace analytes because of their outstanding absorptive capacity but also effectively enrich the cationic dye molecules to the “hot spots” through electrostatic interactions, resulting in higher SERS selectivity. Excellent SERS performance was observed, which exhibited a high enhancement factor (EF) of 5.81 × 108 and a low detection limit (LOD) of 1 × 10−11 mol L−1 with R6G as the probe molecule, and also possessed exceptional reproducibility and stability for at least 28 days. The Fe3O4@CoNi LDH@Ag NPs were used to detect MB, which displayed wide linearity (1 × 10−10 to 1 × 10−4 mol L−1) and high recoveries (89.68–103.72%). This Fe3O4@CoNi LDH@Ag NP substrate offers easy separation and selective detection of cationic dyes, providing potential application for the detection of environmental contaminants.
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Advanced Science
·
2025
·
IF 14.1
Zhuo Chen,Tianyu Liu,Irfan Ismail,Fan Qian,Lianping Zhang,Shutao Yang,Xiaoke Zhang,Lingpeng Yan,Yunfei Han,Qun Luo,Yongzhen Yang,Chang-Qi Ma
The conductivity of AgNWs electrodes can be enhanced by incorporating Ag grids, thereby facilitating the development of large-area flexible organic solar cells (FOSCs). Ag grids from vacuum evaporation offer the advantages of simple film formation, adjustable thickness, and unique structure. However, the complex 3D multi-component structure of AgNWs electrodes will exacerbate the aggregation of large Ag particles, causing the device short circuits. To address this issue, the relationship between the surface energy of modification layers and the morphology and conductivity of ultrathin Ag on AgNWs is studied. The amorphous ZnO (α-ZnO) layer promotes Ag growth from Volmer–Weber (VW) to Frank–Van der Merwe (FM), reducing particle aggregation. The 1 µm thick PET/AgNWs/Ag grid electrode with α-ZnO exhibited low contact resistance and high conductivity. As a result, 1 cm 2 FOSCs with Ag grids achieve a power conversion efficiency (PCE) of 16.01%. As the area increased to 4 and 9 cm 2 , the performance of the monolithic FOSCs is 14.70% and 12.69%, showing less efficiency loss during upscaling. The 8 and 16 cm 2 modules constructed by series and parallel connection of the monolithic devices yield PCEs of 14.47% and 12.92%, respectively. This study offers valuable insights into constructing Ag grids on AgNWs electrodes for highly efficient large-area FOSCs.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-10
·
IF 5.3
Zhai Xiurong,Li Qian,Cao Yang,Han Mengjie,Sun Hailian,Du Lelin,Yang Xiyun,Wei Yuxin,Yu Congcong
An electrochemical platform for signal amplification probing chloride ions (Cl − ) is constructed by the composite integrating core–shell structured nitrogen-doped porous carbon@Ag-based metal–organic frameworks (NC@Ag-MOF) with polypyrrole (PPy). It is based on the signal of solid-state AgCl derived from Ag-MOF, since both NC and PPy have good electrical conductivity and promote the electron transport capacity of solid-state AgCl. NC@Ag-MOF was firstly synthesized with NC as the scaffold and then, PPy was anchored on NC@Ag-MOF by chemical polymerization. The composite NC@Ag-MOF-PPy was utilized to modify the electrode, which exhibited a higher peak current and lower peak potential during Ag oxidation compared with those of Ag-MOF and NC@Ag-MOF-modified electrodes. More importantly, in the coexistence of chloride (Cl − ) ions in solution, the NC@Ag-MOF-PPy-modified electrode displayed a fairly stable and sharp peak of solid-state AgCl with the peak potentials gradually approaching zero, which might effectively overcome the background interference caused by electroactive substances. The oxidation peak currents of solid-state AgCl increased linearly with the concentration of Cl − ions in a broad range of 0.15 µM–40 mM and 40–250 mM, with detection limits of 0.10 µM and 40 mM, respectively. The practical applicability for Cl − ions determination was demonstrated using human serum and urine samples. The results suggest that NC@Ag-MOF-PPy composite could be a promising candidate for the construction of the electrochemical sensor.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 27
·2200791
·
IF 29.698
Guoliang Zhang,Chengyan Liu,Liang Guo,Ruowei Liu,Lei Miao,Feng Dang
As cathode catalysts for lithium–oxygen batteries (LOBs), 2D materials are attracting significant attention due to their layered structures, tunable surface chemistry, and unique electronic states. However, catalytic anisotropy, particularly the poor catalytic capability of the van der Waals forces contained in stack edge planes, has suppressed the enhancement of LOB performance as 2D cathode catalysts. Here, an ion-intercalation strategy is proposed to diminish the catalytic anisotropy of 2D materials. Ag ions are successfully intercalated into SnSe 2 layered structure and regulate the electronic states between stack edge planes, leading to an improvement in the catalytic capability of 2D SnSe 2 . Notably, the catalytic capability of the 2D surface (001) plane of SnSe 2 is also significantly enhanced after Ag intercalation, which can efficiently accelerate charge transfer and suppress the passivation on the 2D surface plane during the oxygen reduction/evolution reaction process. As a consequence, the Ag-intercalated SnSe 2 cathode exhibits superior specific capacity of 16871 mAh g −1 and an ultrastable cycle life over 2300 h at a current density of 100 mA g −1 and 144 cycles at current density of 1000 mA g −1 . This work provides insights into the modulation of the catalytic capabilities of 2D materials, which have significant potential for this application in LOBs.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kaiyue Li,Wenhui Li,Ping Huang,Yuquan Zhuo,Ziwen Yang,Bo Wang,Runru Liu,Bing Liu,Enzhu Hou,Shuo Yang,Donglai Han
To address the challenge of achieving simultaneous pollutant removal and real-time monitoring in water remediation, Z-scheme Cu 2 O/g-C 3 N 4 /Ag heterostructures with integrated functionalities for synergistic adsorption, photocatalytic degradation, and surface-enhanced Raman scattering (SERS) detection were developed—hereafter referred to as APS-Hs (adsorption–photocatalysis–SERS heterostructures). Particular emphasis was placed on the Cu 2 O/g-C 3 N 4 /Ag-1.5 APS-Hs, incorporating an optimized 1.5 wt% Ag loading. Optical and electrochemical tests demonstrated that the Cu 2 O/g-C 3 N 4 /Ag-1.5 APS-Hs significantly enhanced charge separation efficiency and reduced charge transfer resistance. Under visible-light irradiation, the Cu 2 O/g-C 3 N 4 /Ag-1.5 APS-Hs attained a removal efficiency of 98.1 % for methyl orange (MO) within 45 min and sustained an efficiency of 84.0 % after three consecutive cycles. XRD and SEM analyses conducted before and after photocatalytic cycling confirmed the composite's outstanding structural and morphological stability. Notably, the Cu 2 O/g-C 3 N 4 /Ag-1.5 APS-Hs demonstrated the highest adsorption capacity (21.34 mg/g) among all samples. Zeta potential measurements revealed a surface charge reversal from + 22.35 mV to −10.29 mV, indicative of strong electrostatic interactions with anionic pollutants. Pseudo-second-order (PSO) kinetic modeling (R 2 =0.971) further established physisorption as the dominant mechanism. Radical trapping experiments verified that the enhanced photocatalytic performance originates from the Z-scheme charge transfer pathway. Additionally, the Cu 2 O/g-C 3 N 4 /Ag-1.5 APS-Hs substrate achieved a SERS enhancement factor of 3.1 × 10 6 and a broadband self-cleaning capability, underscoring its potential for integrated environmental remediation and sensing applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 26
·1-16
·
IF 2.8
Wei Qian,Zheng Meng
Microplastics (MPs) pose significant environmental and health risks, and conventional disposal methods often suffer from inefficiency and potential ecological harm. Photocatalytic degradation has emerged as a promising solution. However, traditional TiO 2 -based photocatalysts are limited by high electron–hole recombination rates, narrow visible light absorption, and poor reusability. In this study, we develop and optimize a Fe 3 O 4 @TiO 2 /Ag nanocomposite for the efficient degradation of polyethylene (PE) MPs with facile recovery. The synergistic integration of Fe 3 O 4 and Ag with TiO 2 enhances visible light absorption and mitigates charge carrier recombination. Notably, the Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits a degradation efficiency of 15.54%, outperforming Fe 3 O 4 @TiO 2 (12.63%) and pristine TiO 2 (1.15%). Moreover, the composite maintains its performance over five consecutive cycles, underscoring its durability. The degradation efficiency of Fe 3 O 4 @TiO 2 /Ag was further optimized using response surface methodology. Overall, the developed Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits excellent photocatalytic efficiency, magnetic recoverability, and long-term stability, highlighting its potential for practical applications in mitigating microplastic pollution.
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危险品化学品经营许可证（带存储）