Food Analytical Methods
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2025
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IF 3
Li Congwei,Wang Beibei,Kang Kai,Wang Lanyue,Zhao Zhenzhen,Wang Yuping,Ji Xueping
To address ciprofloxacin (CIP) contamination in animal-derived foods, an ultrasensitive electrochemical sensing platform based on a novel ternary heterostructure (Ag-TiO 2 @Zr-TCBPE) was developed through interfacial engineering. The heterointerface was constructed by anchoring a metal–metal oxide electrocatalyst (Ag-TiO 2 ) onto a conductive metal–organic framework (Zr-TCBPE) with a 3D porous hexagonal prismatic structure and high conductivity. This work demonstrates for the first time that the large-scale conjugated architecture of Zr-TCBPE nanotubes enhances CIP enrichment, while the Ag-TiO 2 /Zr-TCBPE heterointerface optimizes electron transport pathways and synergistically promotes CIP oxidation via interfacial electric field-driven effects. Under acidic conditions (pH 5.0), the Ag-TiO 2 @Zr-TCBPE/GCE sensor exhibited optimal performance: a linear range spanning five orders of magnitude (2.5 nmol·L −1 to 150 μmol·L −1 ), a limit of detection (LOD) of 1.6 nmol·L −1 , surpassing most reported CIP sensors. The sensor also showed high anti-interference capability (97.1–107% signal retention), long-term stability (> 96.4% signal retention after 15 days), and satisfactory recovery rates (91.6–103%) in complex matrices (milk, eggs, and river water). This study provides fundamental insights into TCBPE-MOF heterointerface engineering and establishes a robust analytical platform for detecting trace antimicrobials in food and environmental samples.
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高影响因子
MICROCHIMICA ACTA
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2025
·Vol. 192
·期 9
·1-11
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IF 5.3
Zuo Yang,Lin Xiaojie,Chen Nuo,Zhou Xiaoxiang,Yu Huimin
A Au@Ag core–shell nanoparticles (NPs)-based digital image colorimetric method, coupled with headspace single-drop microextraction technique (HS-SDME), was developed for the sensitive speciation of sulfite and sulfide. The entire experiment was conducted in a compact headspace bottle with Au@Ag NPs as droplets that selectively reacted with H 2 S to generate a brown product, prior to the readout of RGB values through a smartphone, thus to conduct the accurate qualitative and quantitative determination. In this way, the speciation differentiation of sulfite and sulfide was achieved by controlling their respective conditions of vapor generation. In addition, by combining the sample introduction of chemical vapor generation, headspace enrichment, and drop microextraction, HS-SDME effectively alleviated matrix interference and further improve analytical performance. The linearity ranges for sulfide and sulfite were 4–14 and 8–18 μmol·L −1 , with detection limits (LODs) of 1.60 and 1.32 μmol·L −1 , respectively. This whole device featured a simple structure and compact size, requiring 3 mL of sample volume, which replaced large-scale chromatographic separation equipment with a smartphone application to some degree, enabling detection to be completed in 30 min. This method demonstrated promising application prospects in on-site speciation determination of sulfite and sulfide in environmental water. Graphical abstract
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高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Lei Sun,Zeyun Yang,Limao Cairang
As a tripeptide molecule widely present in living organisms, glutathione (GSH) exhibits remarkable antioxidant and detoxification effects, and is involved in important physiological processes such as amino acid transport and cellular metabolism. Electrochemical detection can accurately and sensitively determine the GSH content in biological samples, which provides an important basis for early diagnosis, disease assessment and termination monitoring. In this study, ethylenediamine tetraacetic acid (EDTA) was grafted onto the framework of MOF-808 through the strategy of post-synthetic modification, which effectively increased the number of metal affinity active sites on the material. Furthermore, silver ions were abundantly and firmly chelated on MOF-808-EDTA through coordination, and an electrochemical sensing platform (MOF-808-EDTA-Ag/GCE) was successfully constructed for detecting GSH. Due to the solid-state signal amplification effect of AgCl, the current signal (I Ag ) can be significantly improved, while GSH preferred to competitive binding with Ag on the electrode surface, resulting in the extrusion effect caused by competitive coordination, thus the current signal decreased. The sensor realized the quantification of GSH through the decline level of current response, showing a satisfactory linear range (0.02 nM∼20 μM) and a low detection limit (0.013 nM). At the same time, the sensing platform has also been successfully used to measure the GSH content in human serum and urine, the recovery results (95.9 % ∼ 108.8 %) and relative standard deviation (RSD < 4.05 %) were all within the acceptable range, which exhibited an excellent practical application value.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaohui Ren,Zhen He,Qiao Kang,Jiahao Li,Caoyuan Guo,Wenjie Ma,Zhonglin Xiang
The discharge of textile wastewater into the water environment caused continuous pollution and poses a potential threat to public health. It is meaningful to develop an inexpensive, effective and pollution-free method for the ultrasensitive detection of residual Congo red (CR) in textile wastewater. Ag particles were prepared using ascorbic acid reduction method with glutamine as the guiding agent. Then, Ag particles were modified with 3-aminopropyltriethoxysilane to bring -NH 2 onto the surface of the Ag particles. Surface imprinting polymerization method for coating imprinted layer on Ag-NH 2 surface using CR as the template molecule (Ag@MIPs). The morphological characteristics of Ag@MIPs was performed on Scanning Electron Microscopy equipped with Energy Dispersive Spectrometer, X-ray Diffraction, Fourier Transform Infrared Spectroscopy, etc. The enhancement effect of CR was researched when using Ag@MIPs as SERS substrate. Examining the SERS substrate for detecting different concentrations of CR, it was found that the minimum concentrations of Ag and Ag@MIPs were 1.0 × 10 –7 mol l -1 and 1.0 × 10 –9 mol l -1 , respectively. Besides, Ag@MIPs shown satisfactory selectivity and sensitivity to CR instead of methylene blue due to the imprinted holes that match template molecules. This method provides an ultrasensitive method for the qualitative and semi-quantitative detection of CR in textile wastewater.
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高影响因子
CARBON
·
2024
·
IF 10.5
Lu Xu,Ranran Si,Qi Ni,Jiaan Chen,Jiale Zhang,Qing-Qing Ni
Simultaneously achieving excellent shielding effectiveness (SE) and high absorption rate of flexible electromagnetic interference (EMI) shielding materials has become a growing demand for the new generation of highly integrated electronic devices. This study constructed a double-layer polydimethylsiloxane (PDMS) EMI shielding composite film, with the upper layer using Ni-plated carbon fiber (Ni@CF) as the high absorption loss part and the lower layer using Ag-plated graphene fiber (Ag@GF) as the reflection attenuation part. Due to the synergistic magnetic/dielectric loss effect in the upper layer, high electrical conductivity in the lower layer, and the shielding mechanism of “absorption-reflection-reabsorption” induced by the double-layer structure, this composite film achieves efficient EMI shielding performance and high absorption characteristics in the X-band. The EMI SE values of the 2 mm thick film containing 0.03 wt% Ni@CF and 1.2 wt% Ag@GF reach 33.7 dB, while shielding effectiveness of reflection ( SE R ) and absorption ( SE A ) is 0.8 dB and 32.9 dB, respectively. This result means that the composite film only reflects 17.2 % of the microwaves while shielding 99.9 % and absorbs nearly 82.7 %, exhibiting a significant absorption-dominated shielding mechanism. This flexible and efficient shielding film with a high absorption rate suits portable and wearable intelligent electronic products to reduce secondary electromagnetic pollution.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zixin Xie,Xihong Zu,Qianwei Lai,Yicheng Cao,Xueqing Qiu
Hydrogen production by biomass electrolysis offers a promising and sustainable route for producing green hydrogen and high-value utilization of biomass. However, this process consumes electricity and suffers from low anode Faraday efficiency of the organic electro-oxidation reaction. Herein, we develop a novel strategy that integrates a room-temperature, high-power lignin-derived aldehyde flow fuel cell (FFC) with hydrogen production, which converts the power-consuming electrocatalytic hydrogen production step into an electricity-generating process. The highly active Ag-Cu x O/CF (copper foam) electrocatalyst exhibits dual functionality of efficient electricity generation and simultaneous hydrogen production by catalyzing low-potential aldehyde group oxidation at the anode, which concurrently releases electrons and generates hydrogen. The Ag-Cu x O/CF electrocatalyst can significantly improve the electron transfer rate and catalytic conversion efficiency of the anode, attributable to its mixed Cu 0 /Cu + valence states, enlarged double-layer capacitance (C dl ), reduced interfacial resistance, and optimized adsorption capacity. The Ag-Cu x O/CF catalyst achieves ∼95 % benzaldehyde conversion and ∼98.4 % Faradaic efficiency for hydrogen production at 0.35 V RHE . Furthermore, the FFC based on Ag-Cu x O/CF electrocatalyst demonstrated excellent dual-functionality at room temperature, achieving both a power density of 173.5 mW cm −2 and a hydrogen production rate of 1.96 mmol cm −2 h −1 . The constructed FFC achieved a room-temperature power density threefold greater than the reported lignin-based power generation technology, while maintaining comparable hydrogen production rate to biomass electrolysis processes. This study provides a novel approach to reduce the cost of green hydrogen production and mitigate the global energy crisis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Fei Liu,Thien-Phap Nguyen,Qin Wang,Florian Massuyeau,Yi Dan,Long Jiang
Constructing a conductive interface is crucial for the transfer of photoexcited charges in the photocatalytic heterojunction system. In this study, we introduced Ag into g-C 3 N 4 /P3HT system to construct a conductive interface which benefits for transfer of photoexcited charges between g-C 3 N 4 and P3HT. A series of characterizations were employed to investigate the chemical structure , morphology and optical property of the obtained catalysts. And the photocatalytic activity of the as-prepared g-C 3 N 4 /Ag/P3HT composites were evaluated by the degradation of tetracycline (TC) and methyl orange (MO) aqueous solution under visible light irradiation. Results show that the g-C 3 N 4 /Ag/P3HT exhibits a broad absorption band in the region of 400–700 nm and the photocatalytic activity of g-C 3 N 4 /Ag/P3HT obtains a great improvement comparing with that of g-C 3 N 4 , g-C 3 N 4 /Ag and g-C 3 N 4 /P3HT. In addition, the optimized loading content of P3HT is 0.3 mass% based on g-C 3 N 4 . The enhanced photocatalytic performance is due to the introduction of Ag, which improves the transfer of photoexcited charges between g-C 3 N 4 and P3HT. The active species trapping experiment shows that the main active specie is O 2− . After five recycling experiments, the g-C 3 N 4 /Ag/P3HT shows high stability in the photocatalytic performance.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Sun Yihan,Liu Mingming,Zhiguang Guo
Herein, a catalytic mesh with unique wettability, high oil-water separation efficiency and excellent catalytic performance towards aromatic dyes was fabricated. Polypyrrole (PPy) was firstly pre-coated on pristine stainless-steel mesh (SSM) surface via cyclic voltammetry approach. Subsequently, a simple electrodeposition process was performed to prepare and anchor Ag nanoparticles (AgNPs) onto the PPy-coated SSM surface. The PPy-coated mesh with anchored AgNPs was denoted as PPy/AgNPs-coated SSM. The obtained PPy/AgNPs-coated SSM exhibited dual superlyophobic properties and were able to achieve on-demand separation to deal with various of light oil (ρ oil < ρ water ) and heavy oil (ρ oil > ρ water )-water mixtures. Importantly, benefitting from AgNPs on mesh surface, the obtained PPy/AgNPs-coated SSM exhibits exceptional catalytic activity. As proof-of-concept three typical aromatic dye molecules (methylene blue, rhodamine B and Congo red) can be effectivity degraded. Additionally, the degradation of aromatic dyes and oil-water separation were achieved simultaneously when the PPy/AgNPs-coated SSM was converted to water-removing mode. Therefore, the present work is of great significance to the development of novel oil-water filtration membranes and can open a new avenue towards the practicability of metal nanoparticle catalysts in wastewater treatment.
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Chen Chen,Ximo Wang,Yingfang Zhang,Xingying Li,Huiju Gao,Geoffrey I.N. Waterhouse,Xuguang Qiao,Zhixiang Xu
Herein, a molecularly imprinted surface-enhanced Raman spectroscopy (SERS) sensor was developed for the selective capture and sensitive detection of tryptamine in foods. The SERS sensor exploited silver nanoparticle-decorated TiO 2 (TiO 2 @Ag) substrates for Raman signal enhancement via synergistic effect of electromagnetic enhancement and photoinduced charge-transfer, whilst surface functionalization with the molecularly imprinted polymer ensured selective tryptamine capture. The SERS spectrum of tryptamine on the sensor closely matched that predicted by density functional simulations. The SERS intensity for tryptamine on the developed TiO 2 @ [email protected] sensor increased linearly with the logarithm of the tryptamine concentration over the range of 10 −6 –10 −2 mol L −1 , with a LOD of 4.85 × 10 −7 mol L −1 . Tryptamine was detected in a spiked white vinegar sample, and its recoveries were in the range of 92.00%–111.40%. The SERS sensor could be used for the detection of tryptamine in actual samples.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingwang Lan,Qing Li,Lili Cao,Cheng Du,Luis Ricardez-Sandoval,Guoyi Bai
Fabrication of novel heterogeneous catalysts with well-designed structures is unusually intriguing for CO 2 conversion. In this study, we have prepared a porous hollow N-doped carbon tube through the pyrolysis of self-assembled melamine cyanurate aggregate supramolecular precursor. Ultrasmall Ag nanoparticles were tightly anchored in the hollow N-doped carbon tube via an in-situ fabrication. The average size of Ag nanoparticles was confined in only 2.19 nm with the assistance of abundant surface functional groups and porous structures. Additionally, inherent hollow N-doped carbon tube structure could prevent nanoparticles aggregating and leaching; also, they facilitated gas adsorption and mass transfer in CO 2 catalysis. Due to their remarkable properties, the novel material was utilized as heterogeneous catalyst for the carboxylation of alkynes with CO 2 , and exhibited outstanding catalytic activity and stability at ambient pressure and low temperature.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Wei Wang,Cong Liu,Mutian Zhang,Chenyang Zhang,Lin Cao,Chunfeng Zhang,Tengfei Liu,Debao Kong,Wen Li,Shougang Chen
It is a major challenge to combine the advantages of two kinds of two-dimensional materials to construct a heterojunction and achieve efficient photocatalytic antifouling. In this work, we covalently connected two materials MXenes and covalent organic frameworks (COFs) through the Schiff base reaction and anchored Ag nanoparticles (NPs) to prepare a Ti 3 C 2 /TpPa-1/Ag composite material with high efficiency bactericidal properties. The covalent bonding between MXene and COF greatly improved the stability of the material. Ti 3 C 2 /TpPa-1/Ag composite showed an excellent antibacterial property against S. aureus and P. aeruginosa . The fluorescence spectra of Ti 3 C 2 /TpPa-1/Ag proved that the electron transfer channels formed between the ternary materials could greatly improve the efficiency of carrier separation and prolong the life of photogenerated carriers. Density functional theory calculations showed that the synergistic catalytic effect of Ag and Ti 3 C 2 could greatly reduce the work function along the interface, and the built-in electric field between the layers drive carrier fast migration, which effectively improve the catalytic performance.
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高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Zhihui Li,Mengke Ma,Chaojin Yang,Yifan Deng,Min Guo,Zhaohui Jiang,Haofei Huang
Hierarchical PPy/GO/Ag coatings boost broadband photothermal conversion. • Controlled LbL self-assembly of PPy, 2D GO and 0D Ag NPs is achieved. • Multilayer interfaces enable solar evaporation and thermoelectric/thermotherapy. Solar energy as abundant, carbon-neutral and globally accessible energy, has garnered considerable research attention in sustainable photothermal conversion technologies. To overcome the intrinsic limitations of narrow spectral absorption and incomplete photon utilization in single-component photothermal systems, this work engineered the hierarchical polypyrrole/graphene oxide/silver nanoparticles (PPy/GO/Ag) composite coatings with multilayer interfaces on fabrics through convenient and universal layer-by-layer (LbL) self-assembly strategy. This rational design yielded hierarchical PPy/GO/Ag composite coated fabrics with 93.3% broadband absorption across the solar spectrum (300–2500 nm). Under 1 kW·m⁻ 2 (1 sun) solar irradiation, the optimized PPy(GO/Ag)-3 composite coatings achieved a steady-state surface temperature of 73.1 °C within 300 s. When integrated with a commercial thermoelectric module, the composite coatings as flexible photo-thermoelectric generator leveraging the Seebeck effect, delivered a stable open-circuit voltage of 39.7 mV and short-circuit current of 9.4 mA, corresponding to a power density of 233.2 mW·m⁻ 2 . In solar-driven interfacial evaporation, the composite coatings achieved high water evaporation rate of 2.01 kg·m⁻ 2 ·h⁻ 1 with photothermal conversion efficiency of 92.1% under 1 sun irradiation. For personal thermotherapy, the composite coated fabric maintained a safe and therapeutically effective surface temperature on human body under both simulated sunlight and natural daylight. Thus, this work provided a versatile photothermal platform for next-generation solar-harvesting systems targeting multi-scenario applications. Download: Download high-res image (322KB) Download: Download full-size image
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