Food Analytical Methods
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2026
·Vol. 19
·期 10
·303
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IF 3
Tu Xiaodong,Yao Mingcai,Dong Liang
A chloramphenicol (CAP) electrochemical sensor based on zinc tungstate and maghemite nanocomposites (ZnWO 4 /γ-Fe 2 O 3 ) is proposed. First, ZnWO 4 and γ-Fe 2 O 3 nanomaterials were synthesized using a hydrothermal synthesis method, then compositely modified onto glassy carbon electrodes to construct electrochemical sensors for measuring CAP. Under optimal conditions, the ZnWO 4 /γ-Fe 2 O 3 -modified electrode exhibits a stronger reduction peak current for CAP detection than the single-component electrode and demonstrates better electrocatalytic activity. The results demonstrate that ZnWO 4 /γ-Fe 2 O 3 /GCE exhibits a linear detection range of 8–1000 μM and a detection limit of 1.04 μM, demonstrating good selectivity in the presence of different interferers, as well as outstanding stability and reproducibility. ZnWO 4 /γ-Fe 2 O 3 /GCE was used to detect of CAP in milk samples, yielding satisfactory results.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Liu-Xin Cai,Li Chen,Xi-Qian Sun,Jing Geng,Chen-Chen Liu,Yue Wang,Zheng Guo
One-dimensional hetero-structured nanofibers (NFs) have recently received great attention because of their rich architectures and potential applications in the field of gas sensors. Polyoxometalate (POM) is a unique nanosized transition metal-oxygen cluster used as a molecular platform to prepare metal oxide nanomaterials and accompanied by high negative charges that readily combine with various metal oxide precursors to form metal oxide complexes. Herein, with the assistance of POM, ZnWO 4 /ZnO hetero-structured NFs were prepared by combining facile electrospinning with thermal oxidation . Adjusting the molar ratio of POM (H 3 PW 12 O 40 ·xH 2 O, denoted as PW 12 ) and Zn(NO 3 ) 2 ·6H 2 O (denoted as Zn 2+ ) in the precursor solution , a series of ZnWO 4 /ZnO hetero-structured NFs were obtained. Compared with pure ZnO NFs, the optimized ZnWO 4 /ZnO hetero-structured NFs demonstrate more excellent sensing performance. A high relative response of 108.5 was achieved for 50 ppm triethylamine (TEA) and with a low detection limit about 150 ppb. Furthermore, the ZnWO 4 /ZnO hetero-structured NFs exhibited remarkable TEA selectivity and outstanding reproducibility. The enhanced sensing mechanism toward TEA could be attributed to n-n heterojunctions with the obvious barrier-control electron transfer effect at the interface between ZnWO 4 and ZnO.
研究领域:
材料科学
·
化学传感器
·
纳米材料
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Xuanye Zhao,Lantian Zhang,Qingyang Pang,Youlin Wu,Chaoyue Zheng,Jihuai Wu,Canzhong Lu,Bifen Gao,Yiming Xie
To address the prevalent problems of rapid photogenerated carrier recombination and insufficient redox capacity in photocatalytic hydrogen evolution, this work constructs a ZnWO 4 /Mn 0.2 Cd 0.8 S (ZWO/MCS) heterojunction photocatalyst featuring an S-scheme band structure. The addition of ZnWO₄ (ZWO) significantly boosts the photocatalytic activity of Mn 0.2 Cd 0.8 S (MCS). Under irradiation with simulated visible light, the 20ZWO/MCS composite exhibited the highest hydrogen production rate (30.22 mmol·g −1 ·h −1 ), 44.44 times that of pure ZWO and 4.51 times that of pure MCS, respectively. It also demonstrates excellent catalytic stability during continuous cycling tests. Through a systematic investigation of its structure, optoelectronic properties, and photocatalytic hydrogen evolution performance, combined with density functional theory (DFT) theoretical calculations, it was confirmed that a tight heterointerface forms between ZWO and MCS, establishing an S-scheme interfacial charge transfer route driven by the internal electrical field (IEF). Through the pathway, the photogenerated charges are efficiently separated spatially, with electrons enriched in the conduction band of MCS for proton reduction for hydrogen production, while holes gather within the valence band of ZWO. The study deepens the understanding of the behavior of charge carriers in S-scheme heterojunctions regarding their separation and migration, providing theoretical foundations and material design strategies for developing high-performance photocatalytic systems. Combined with in-situ experimental characterization and DFT theoretical calculations, it has been confirmed that the built-in electric field (IEF) formed by the difference in work function drives the migration of photo generated electrons from ZWO to MCS, following an S-shaped charge transfer path, achieving efficient spatial separation of charge carriers. Download: Download high-res image (431KB) Download: Download full-size image
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2026
·
IF 5.9
Yadong He,Changsheng Tang,Zhangyong Li,Shu Zhao,Yixin Kang,Yangxin Zhang,Xinzhan Wang,Ling Li
A hierarchical CCO@ZWO core-shell architecture was fabricated on nickel foam. • Binder-free CCO@ZWO/NF electrode delivers 3670 mF cm −2 at 1 mA cm −2 . • The CCO@ZWO/NF//AC/NF ASC retains 87.75% capacitance after 7800 cycles. • The ASC device achieves 0.198 mWh cm −2 at 0.75 mW cm −2 . One heavily relied-upon strategy for achieving advanced electrode materials with superior properties for asymmetric supercapacitors (ASCs) is the rational design of hierarchical core-shell heterostructures on conductive substrates. In this work, a well-defined urchin-like CuCo 2 O 4 @ZnWO 4 (CCO@ZWO) core-shell heterostructure was successfully fabricated on porous nickel foam (NF) via a simple two-step solvothermal process, followed by thermal annealing. The hierarchical structure is composed of CuCo 2 O 4 nanoneedles serving as the conductive core, with ZnWO 4 nanosheets uniformly anchored as the shell layer, which collectively provides an extensive specific surface area with a high density of electroactive centers and favorable ion/electron transport kinetics. With a binder-free architecture, the CCO@ZWO/NF composite delivers a high areal capacitance of 3670 mF cm −2 at a current density of 1 mA cm −2 , enabling the assembly of an asymmetric supercapacitor with CCO@ZWO/NF as the positive electrode and NF-supported activated carbon as the negative electrode. The device exhibited a cycling stability that was evaluated over 7800 cycles at 4 mA cm −2 , showing a capacitance preservation of 87.75%, while a capacitance per unit area of 633.7 mF cm −2 was obtained at 1 mA cm −2 . The remarkably improved electrochemical performance stems from the cooperation between the two components and the robust core-shell architecture, which effectively mitigates volume expansion and structural collapse during repeated cycling. These findings underscore the considerable promise of the designed CCO@ZWO core-shell heterostructure in serving as an advanced electrode material, offering a viable pathway for exceptional energy storage applications. A biomimetic urchin-like CuCo 2 O 4 @ZnWO 4 core-shell heterostructure was grown on nickel foam via a two-step solvothermal method with subsequent annealing. The hierarchical architecture provides a large specific surface area, abundant active sites, and fast ion/electron transport. The CCO@ZWO/NF electrode delivers a high areal capacity of 3670 mF cm −2 at 1 mA cm −2 , and the ASC device achieves an energy density of 0.198 mWh cm −2 with 87.75% retention after 7800 cycles. This superior performance stems from the synergistic interplay between the core-shell morphology and the multi-metal oxide composition. Download: Download high-res image (352KB) Download: Download full-size image
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Nanoscale
·
2024
·
IF 5.8
Han Cheng,Bo Tang,HuaYang Bao,Fan Shan,ChunXu Lu
The phase change microcapsules (NePCMs) with high latent heat values, thermal conductivity and stability were synthesized by coating stearic acid (SA) phase change material (PCMs) with Zinc tungstate (ZnWO4) as the shell material. The prepared ZnWO4 and microcapsule samples are characterized through various techniques, and their thermophysical properties under different core-shell ratios and emulsifiers are compared. The highest phase transition enthalpy reaches 83.63 J g-1 when the core-shell ratio is 1:1 and the sodium dodecylbenzenesulfonate (SDBS) is adopted as the emulsifier. Based on SEM and TEM results, the regular spherical shape and complete core-shell structure of the microcapsule can be found, and the particle size ranges between 100-300 nm. The thermal conductivity of the SA has increased by 141.18%~238.43% after by using the ZnWO4 as the shell material. Moreover, thermogravimetric and leak-proof performance tests demonstrated that microcapsule samples possess a high thermal stability. There was no leakage from the six microcapsule samples after heating, proving their potential application for thermal energy storage (TES) under long-term high-temperature conditions. In addition, the cost of ZnWO4 prepared by this method can be reduced about 40%. According to UV absorption and fluorescence spectrum evaluation, ZnWO4 and microcapsule samples have good photoluminescence and UV absorption properties, making the sample can be widely employed in fluorescent construction, coatings and textile industries with a lower cost.
研究领域:
材料科学
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能源工程
·
化学工程
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Surfaces and Interfaces
·
2024
·
IF 5.7
Zhishan Luo,Yuanmeng Fang,Jinhao Chen,Yanyan Wu,Feiran Jia,Liyan Xie,Wei Ren,Minghua Liu,Qing Liu,Jianhui Huang
In this study, a Z-scheme heterostructure was meticulously engineered between zinc tungstate (ZnWO 4 ) nanofibers and polymeric carbon nitride (PCN) nanosheets to augment the photocatalytic degradation of tetracycline (TC) under visible light irradiation. A cohesively integrated PCN/ZnWO 4 photocatalyst structure was synthesized through an in-situ gas-solid reaction. The quantity and spatial distribution of PCN nanosheets were modulated by fine-tuning the gas precursor and reaction parameters. Relative to pristine ZnWO 4 nanofibers and PCN photocatalysts, the distinct three-dimensional PCN/ZnWO 4 heterostructure manifests a notable enhancement in photocatalytic performance, attributed to its plethora of active sites and a Z-scheme configuration that bolsters charge separation efficiency, achieving a tetracycline degradation rate of 95.4% upon exposure to simulated sunlight for 160 minutes. The employment of gas-solid reaction as a design paradigm pioneers a fresh paradigm in the strategic assembly of Z-scheme heterostructured photocatalysts, thereby illuminating a promising pathway for advancements in environmental remediation technologies.
研究领域:
环境科学
·
材料科学
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Zhihua Zhao,Shixin Ma,Yao Wang
Hydrogen sulfide (H2S), a characteristic byproduct of sulfur-containing amino acid decomposition during fish spoilage, serves as a critical freshness indicator and poses substantial food safety risks. This study develops a novel H2S gas sensor using a ZnWO4/f-MWCNTs nanocomposite synthesized via one-step hydrothermal method. The incorporated functionalized multiwalled carbon nanotubes (f-MWCNTs) improve the sensing material’s conductivity, dispersion stability, and gas adsorption capacity. XRD, XPS, FTIR, SEM, TEM, and BET analyses verify the composite’s successful synthesis and optimal physicochemical properties. The ZnWO4/f-MWCNTs sensor demonstrates exceptional H2S detection at 120 °C, achieving a response value of 18.67 (Ra/Rg) to 50 ppm of H2S with fast response/recovery times (14 s/30 s) and excellent selectivity against interferents. Real-time monitoring of fish spoilage further confirms its practical utility, highlighting the sensor’s potential for meat freshness assessment and food safety applications.
研究领域:
材料科学
·
传感器与检测技术
·
食品安全
·
纳米技术
·
环境监测
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ting Liang,Zebin Yu,Yuejing Bin,Shiming Zhang,Jingwen Wei,Yujia Liu,Tingting Zhu,Songyu Fan,Yuxiang Shen,Shuangfei Wang,Yanping Hou
Inefficient separation and sluggish transfer of photogenerated charges on the photocatalyst is one of the bottlenecks for CO 2 photocatalytic reduction. In this study, the ZnSe/ZnWO 4 heterojunction with tungsten vacancies and oxygen vacancies (ZZ-30%-Vw,o) was synthesized by hydrothermal process and post-etching method for CO 2 reduction. Various characterizations showed superior structural and optical properties of the ZZ-30%-Vw,o heterojunction; results of ESR and work function calculation demonstrated that the heterojunction conformed to S-scheme charge transfer mechanism. Results of various tests and density functional theory (DFT) calculation confirmed the existence of W and O vacancies, as well as the locally polarized electric field (PEF). The PEF and the built-in electric field (IEF) could not only accelerate carriers separation and transfer, but also enhance CO 2 adsorption and activation, thus enhancing photocatalytic activity toward CO 2 reduction. The ZZ-30%-Vw,o composite exhibited the highest CO yield of 96.91 µmol/g/h, approximately 21.0 times of the ZnSe . Moreover, the ZZ-30%-Vw,o possessed favorable structure-performance stability. The COOH* was the most important intermediate during CO 2 reduction, and possible CO 2 reduction pathways and mechanism were proposed. This work paves a feasible way for improving photocatalytic activity via introducing dual surface vacancies on heterojunction photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
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