NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 34
·16022-16029
·
IF 3.3
Xingguo Deng,Jingchao Li,Bo Zhao,Zhihua Li
In this study, a silver metal–organic framework (Ag-MOF) was immobilized on graphene oxide (GO) sheets via an ultrasonication process. The Ag-MOF@GO composite showed enhanced physicochemical properties, including an improved surface area and lower agglomeration, as confirmed using characterization techniques such as X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method, and scanning electron microscopy (SEM). Malachite green (MG) is a typical cationic dye, which can be toxic, cause environmental damage and threaten human health. Therefore, the adsorption capacities of Ag-MOF and Ag-MOF@GO for the MG dye were also evaluated at room temperature. Kinetic analysis revealed a significant increase in the adsorption capacity and rate of adsorption of Ag-MOF@GO compared with Ag-MOF. The addition of GO increases the surface area of Ag-MOF@GO and reduces the agglomeration effect, resulting in an improved adsorption capacity. Ag-MOF@GO showed a greater than 90% regenerability after three cycles.
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TALANTA
·
2022
·
IF 6.556
Haoyang He,Da-Wen Sun,Hongbin Pu,Zhihui Wu
Food aflatoxin B1 (AFB1) contamination greatly threatens human health and its sensitive determination is imperative. In this study, a surface-enhanced Raman scattering (SERS) and fluorescence dual-signal aptasensor was constructed for sensitive AFB1 detection in peanuts, walnuts, and almonds samples. Fluorescent dye cy5 was used as fluorophore and Raman reporter, while polyethyleneimine modified Ag coating magnetic nanoparticles (MNP@Ag-PEI) were utilized to absorb the cy5 modified aptamer (apt-cy5). Results indicated that linear ranges of 0.001–1000 ng/mL and 0.2–20,000 ng/mL with detection limits of 0.45 pg/mL and 0.135 ng/mL for the SERS and fluorescence methods were obtained, respectively, and AFB1 detection in the nut samples using the aptasensor achieved satisfactory recoveries of 95.2%–108.6% for SERS and 94.7%–109.7% for fluorescence. Compared with other mono signal detection, the established aptasensor facilely fused the merits of the two signals and improved the detection accuracy and flexibility.
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International Journal of Smart and Nano Materials
·
2022
·
IF 4
Guannan Yang,Shaogen Luo,Bo Luo,Yan Zuo,Shiwo Ta,Tingyu Lin,Zhaohui Zhao,Yu Zhang,Chengqiang Cui
Conductive fillers made from metal nanoparticles offer many advantages for the fabrication of a variety of electronic devices, but when they have a porous structure, their poor conductivity limits their adoption in many applications. In this study, an Ag-coated Cu micro-nanoparticle paste is used to achieve compact filling of blind vias on flexible copper clad polyimide laminates through a multistep filling and sintering technique. The filled blind vias achieve a resistivity as low as 6.2 μΩ·cm, which is comparable that of electroplated blind vias. Higher sintering pressure and temperature promote the filling performance, while the conductivity deteriorates at a via depth/diameter ratio greater than 1:1. Finite element simulations reveal a stress inhomogeneity in vias with large depth/diameter ratios, which is the key to understanding the evolution of the conductive properties of a paste-filled via. This study provides an effective method for high-performance microvia filling as well as insights into the mechanism that influences its performance.
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CHEMOSPHERE
·
2022
·
IF 8.943
Lina Wang,Hanpei Yang,Li Kang,Mi Wu,Yuankun Yang
In this work, Ag/AgCl/FeOCl (Ag–Fe) catalysts were successfully prepared via multistep routes in which Ag was uniformly anchored to the enriched Cl sites provided by exfoliated FeOCl nanosheets. Among these Ag–Fe catalysts, 5% Ag–Fe exhibited the highest pseudo first-order kinetic constant 0.1056 min −1 for photo-Fenton degradation of Rhodamine B (RhB), which was 11 times higher than that of FeOCl (0.0096 min −1 ). Ag–Fe catalysts exposed more coordinatively unsaturated Fe active sites to coordinate with H 2 O 2 due to the cleavage of Fe–Cl bond. The exposed coordinatively unsaturated Fe(III) active sites could capture the photoinduced electrons and reduce them to Fe(II), which boosted the separation efficiency of photogenerated charge carriers. Meanwhile, the photogenerated electrons of Ag 0 transferred to the FeOCl, promoting the reduction of Fe(III) to Fe(II). In addition, the intensified visible light adsorption (SPR effect) was achieved after introducing Ag/AgCl nanoparticles on exfoliated FeOCl. Hydroxyl radicals (·OH) and holes (h + ) were determined as the main reactive oxidative species (ROS) in the photo-Fenton degradation process.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Linlin Sun,Yibing Feng,Kai Ma,Xiaohan Jiang,Zhengyang Gao,Jigang Wang,Nan Jiang,Xiaoshuo Liu
It is significant to realize the synergistic effect of single-atom sites and its support to obtain excellent performance photocatalysts. Here, single-atom silver (SAAg) is embedded into the hierarchical tremella-like carbon nitride (3DT-CN) by an efficient one-step reduction method. The photo-degradation mechanism of SAAg/3DT-CN for tetracycline (TC) is first proposed. And the synergistic effect to improve photocatalytic activity is also discussed in depth. Density functional theory (DFT) calculations and physicochemical characterizations reveal that the synergistic effect of SAAg and 3DT-CN has improved the absorption capacity of visible light, the binding energy with oxygen, charge transfer behavior and other properties. Electron spin resonance (ESR) and capture experiments validate the active species involved in the reaction. The first-order kinetic constant of TC degradation by SAAg/3DT-CN is 8.4 times and 3.8 times that of 3DT-CN and AgNP/3DT-CN in 75 min, respectively. This work provides a meritorious structure-activity strategy for the removal of refractory antibiotics.
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JOURNAL OF DAIRY SCIENCE
·
2021
·
IF 4.034
Yuanyuan Hui,Haishuai Peng,Fuxin Zhang,Lei Zhang,Liu Yufang,Aiqing Zhao,Rong Jia,Bini Wang,Yuxuan Song
ABSTRACT Aflatoxin M 1 (AFM 1 ) is a common toxin in dairy products that causes acute and chronic human health disorders. Thus, the development of a rapid and accurate AFM 1 detection method is of vital importance for food safety monitoring. This work was to develop a novel electrochemical aptasensor for sensitive and specific determination of AFM 1. The dendritic-like nanostructure was formed on the gold electrode surface by layer-by-layer assembly of gold-silver core-shell nanoparticles modified with DNA conjugates. In the presence of AFM 1 , the specific recognition between AFM 1 and Apt caused the disassociation of the DNA controlled dual [email protected] conjugates from the surface of the electrode, causing less methylene blue to bind to the surface and weakening the electrochemical signal. The more AFM 1 there is, the weaker the electrochemical signal. Transmission electron microscope results showed that the successfully synthesized [email protected] nanoparticles exhibited a core-shell structure with Au as core and Ag as shell, and their average diameter was about 30 nm. Under optimal conditions, the electrochemical aptasensor showed a wide detection ranging from 0.05 ng mL −1 to 200 ng mL −1 , and a low detection limit of 0.02 ng mL −1 . Moreover, the proposed strategy has been successfully applied to the detection of AFM 1 in cow, goat, and sheep milk samples with satisfactory recoveries ranging from 91.10% to 104.05%. This work can provide a novel rapid detection method for AFM 1 , and also provide a new sensing platform for the detection of other toxins.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiang Hou,Jiangfeng Chu,Cong Liu,Jinnan Wang,Aimin Li,Tong Lin,Corvini Philippe François-Xavier
Photocatalytic denitrification has attracted great attention owing to its high efficiency and environmentally friendly features. However, selectively photocatalytic reduction of high concentration nitrate to N 2 is still a challenging problem due to the competition of photons between nitrate and photocatalysts. Herein, the Ag/SiO 2 core encapsulated in the crystalline TiO 2 shell (Ag/SiO 2 @ c TiO 2 ) was constructed for improvement of photocatalytic denitrification. Finite difference time domain (FDTD) simulation demonstrated that strong light scattering improved light harvesting via optical confinement. Meanwhile, surface plasmon resonance and electron sink effect of Ag not only enhanced the photogenerated electrons density but also promoted charge carriers separation of Ag/SiO 2 @ c TiO 2 . More importantly, e cb − of TiO 2 -shell could be immediately transferred to Ag to keep the balance between Ag 0 and Ag + , which contributed to the good stability of Ag/SiO 2 @ c TiO 2 . 95.8% nitrate ( C 0 = 2000 mg/L) was removed by 5 wt%Ag/SiO 2 @ c TiO 2 with N 2 selectivity of 93.6% within 4 h. Even after five cycles, 5 wt%Ag/SiO 2 @ c TiO 2 still remained high photocatalytic denitrification efficiency (92.2%). Notably, since TiO 2 -shell prevented the reaction between Ag and Cl − , more than 92% nitrate could be removed within 5.3 h in the presence of high concentration Cl − .
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Weiwei Zheng,Wentao Tian,Xiaojun Liu,Qingquan Zhang,Chenghua Zong,Jia-Ping Lai,Wenfeng Zhao
Flexible surface-enhanced Raman scattering (SERS) substrates, specifically paper-based SERS substrates, are generally employed in many practical applications. However, paper-based SERS substrate quantitation is still challenging because of the inferior uniformity originating from the irregular morphology of the paper. The present study synthesized Ag nanoparticles (NPs) via the in situ photochemical reduction of Ag + ions on a titanium dioxide (TiO 2 ) film at the polyester fiber membranes (PFMs) surface. This generated many “hot spots” that presented significant SERS activity with an enhancement factor of 2.1 × 10 9 . Sodium saccharin (SS) bonded to the Ag NPs surface via the carbonyl oxygen and ring nitrogen atoms. A SERS sensor with photochemically deposited Ag NPs was prepared for the sensitive and rapid detection of SS in soft drinks with a limit of detection of 0.3 mg/L. The recovery rate ranged from 93% to 103%, indicating that this method is reliable in actual sample detection with simple pretreatment steps and can be potentially applied for the on-site detection of food additives for food safety.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Nuo Duan,Shuo Qi,Yucong Guo,Wei Xu,Shijia Wu,Zhouping Wang
Clenbuterol hydrochloride (CLB), a kind of β-agonist, has been illegally used as a feed additive for growth promotion in the food industry in many countries. Herein, surface-enhanced Raman scattering (SERS) combined with aptamer recognition was used for the ultrasensitive and quantitative detection of CLB. Fe 3 O 4 @ [email protected] nanoparticles displaying strong SERS enhancement were synthesized and used as the active substrate. Aptamer against CLB was immobilized on the surface of the substrate to form the capture probe. The complementary DNA (cDNA) was linked to gold nanoparticles (AuNPs) carrying the Raman reporter 4-mercaptobenzoic acid (4-MBA) to form the signal probe. The detection of CLB was carried out by competitive binding between free CLB and cDNA linked on the signal probe with the aptamer immobilized on the capture probe. The SERS intensity was significantly improved by the coupling effect between the Fe 3 O 4 @ [email protected] and AuNPs, resulting in high sensitivity for the quantification assays with a limit of detection of 0.003 ng mL −1 . The recoveries of the CLB from spiked pork samples were 90.7–108.0% and the coefficients of variation (CV%) were 2.2–3.1%, demonstrating the high precision and accuracy of the assay.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Wei Zhang,Yang Luo,Yang Zhou,Ming Liu,Weitao Xu,Bing Bian,Zhu Tao,Xin Xiao
A new fluorescent probe composed of cucurbit[10]uril (Q[10]) and a water-soluble derivative of pyrene, aminopropyl-1-pyrenebutanamide (PBA), is designated. 1 H NMR spectroscopy reveals that PBA is encapsulated into Q[10] in an aqueous solution to form a stable 1:1 host-guest inclusion complex of PBA@Q[10]. This complex behaves as a highly selective fluorescence quenching probe for Fe 3+ in aqueous solutions that may be attributed to the efficient absorption of Fe 3+ , which hindering absorption of PBA@Q[10] probe at the excitation wavelength of 332 nm, and competitive experiments for the coexistence of Fe 3+ with one or all of the other metal ions (37 metal ions) reveals that the selectivity of PBA@Q[10] to Fe 3+ is not disturbed by the addition of 50.0 equiv. of the other metal ions. The limits of detection of Fe 3+ was determined to be 0.55 mM. Furthermore, the fluorescence enhancing effect of PBA@Q[10] for Ag + is detected at the above wavelength. According to the mechanistic studies, the fluorescence enhancing route involves interaction of Ag + ions with the probe, mainly under an internal charge transfer between Ag + and the probe. Outcomes of this study suggest that PBA@Q[10] probably functions as a potential and promising fluorescence sensor for monitoring of different polluting metal ions in waste waters.
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Small
·
2021
·Vol. 17
·期 37
·2101333
·
IF 13.281
Haowei Lu,Huijie Shi,Gaoru Chen,Yonghui Wu,Jiawei Zhang,Liya Yang,Yaju Zhang,Haiwu Zheng
With the popularity of portable and miniaturized electronic devices in people's live, flexible piezoelectric nanogenerators (PENG) have become a research hotspot for harvesting energy from the living environment to power small-scale electronic equipment and systems because of its stability. For further enhancing output performance of PENG, chemical modification and structural design for piezoelectric fillers are effective ways. Thus, the 3D porous hetero-structure fillers of BCZT@Ag are prepared by freeze-drying method and subsequent chemical seeding reduction. The silicone rubber as matrix is filled into the micro-voids of fillers to prepare specialized composite. The charge transport mechanism and stress transfer efficiency in PENG can be effectively improved through specialized design which is proven by experimental results and multi-physics simulations. The improved PENG exhibit a significantly enhanced output of 38.6 V and 5.85 µA, which is 3.3 and 3.5 times higher than those of PENG without specific design. The prepared PENG can effectively harvest biomechanical energy through walk and joint bending of human body. Moreover, the PENG can be used as a trigger to remotely control wireless collision alarm system, which can acquire rapid response and shows great potential application in Internet of Things.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Zhong Yao,Yu Xinyue,Fu Wanying,Chen Yanwei,Shan Guiye,Liu Yichun
Gold-silver core-shell nanoparticles (Au@Ag NPs) were prepared by two successive reductions in a seed-growth method. The Au@Ag NPs are used as both a colorimetric and Raman spectroscopic probe for ultrasensitive determination of H 2 O 2 and glucose. It is found that H 2 O 2 (as produced from glucose by the action of glucose oxidase) can directly oxidize and gradually corrode the silver shell of the Au@Ag NPs. This results in a drop in the surface plasmon resonance absorbance at 400 nm, and the color of the solution changes from brownish yellow to purple. Without adding any additional chromogenic agents, the color change can be visually observed and detected photometrically. Silver NPs also are an excellent surface-enhanced Raman scattering (SERS) substrate. Due to corrosion of the silver shell, the SERS intensity (measured at 1083 cm −1 ) gradually decreases with increasing glucose concentration. The detection limits are 300 nM of glucose for the colorimetric assays, and 20 nM for the SERS assay.
Schematic representation of the method for glucose determination. H 2 O 2 can oxidize and gradually corrode the silver shell of the gold-silver core-shell nanoparticles. This results in a distinct color change of the solution from brownish yellow to purple, and a drop in SERS intensity. The effect is applied in colorimetric and Raman spectroscopic assays for glucose.
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