KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 2.9
Zou Sujing,Mao Xiqiang,Wu Lei,Li Yang,Li Jun,Yang Jian,Fan Ximei
Photocatalysis technology is considered as a most promising method to decompose organic pollutant since the inexhaustible solar energy and facile reaction condition. Herein, a series of flower-like Ag/AgCl/BiOCl photocatalysts are successfully synthesized via hydrothermal and photochemical deposition method. All the samples are investigated and characterized by X-Ray diffraction, Scanning electron microscopy, transmission electron microscope, ultraviolet–visible spectroscopy and Photoluminescence to insight into the microstructures and optical properties. During the photocatalytic degradation of Methyl orange experiments, the optimized Ag/AgCl/BiOCl sample prepared by photoreduction with 40 min exhibits the excellent photocatalytic performance. Under visible-light irradiation for 60 min, degradation rate of Methyl orange reaches 97%, which is 9.7, 6.1 and 4.6 times higher than that of AgCl, Ag/BiOCl and BiOCl, respectively. The UV–vis diffuse reflectance and Photoluminescence spectra of the Ag/AgCl/BiOCl photocatalyst verify that the enhanced photocatalytic activity is ascribed to its extended absorption range to visible-light region and the efficient separation efficiency of photogenerated carriers. In addition, the radical trapping experiment demonstrates that photogenerated hole and superoxide radicals play critical roles in the methyl orange degradation. The corresponding photocatalytic degradation mechanism is proposed that the excellent photocatalytic activity is attributed to the surface plasmon resonance effect of metallic Ag and heterojunction structure of Ag/AgCl/BiOCl photocatalysts.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaojuan Niu,Lian Xia,Yue Tang,Zhen Wu,Keya Liu,Yuangen Wu
Fumonisin B1 (FB1) is a secondary metabolite produced by Fusariums , which principally contaminates grains and their products, causing pathological and physiological toxicity to humans and animals. Herein, a convenient and rapid colorimetric strategy for FB1 detection was established based on the inhibition effect of FB1 on Ag(I)–3,3′,5,5′-tetramethylbenzidine (TMB) catalytic system. It was found that FB1 can hinder the generation of superoxide anions (O 2 · - ) in the sensing solution, leading to a significant reduction of oxTMB production. Thus, the absorbance and color change of the solution are directly related to the concentration of FB1. Under optimal experimental conditions, there is a satisfactory sensitivity with a limit of detection (LOD) as low as 1.77 ng·mL −1 . Moreover, such colorimetric strategy has outstanding selectivity, and can be used for the detection of FB1 residues in corn and infant rice flour, with a recovery rate of 90.15–109.74 %. Especially, the RGB values corresponding to chromogenic solutions with different FB1 contents can be easily recognized by a smartphone for qualitative and quantitative analysis of FB1. The colorimetric sensing strategy does not require the preparation of nanomaterial, providing a low-cost and promising analysis strategy for FB1 detection.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Ahsan Nazir,Ameena Tur Rasool,Pengwei Huo,Muhammad Saqaf Jagirani
This research used a facile chemical precipitation-photoreduction technique to fabricate a plasmonic p-n heterojunction Ag@Ag 2 O-PbBiO 2 Br (A@AO-PB) photocatalysts. The resulting materials were evaluated using various characterization techniques. Levofloxacin (LEV; 100 ml, 20 mg/l) and tetracycline (TC; 100 ml, 20 mg/l) were successfully photodegraded by the optimized 10 min-A@AO-PB (50 mg) in 120 min under visible light, with efficient degradation rates of 80.6 % and 87.0 %, respectively. The increased absorption of visible light by local surface plasmon resonance (LSPR) of plasmonic Ag and the effective separation and transfer of photogenerated carriers could be the reasons for the increase in efficiency of A@AO-PB. Transient photocurrent response (TRP), electrochemical impedance spectroscopy (EIS), and photoluminescence (PL) studies have all confirmed that 10 min-A@AO-PB effectively separates and transfers photogenerated carriers. In addition, scavenger studies have shown that the dominant active species that participated in the removal of LEV and TC are h + and •O 2 − . To find intermediates, the potential photodegradation pathways of LEV and TC were also investigated through HPLC-MS. Thus, this work describes a new photocatalyst design and a desirable plasmonic photocatalyst with p-n heterojunction that can effectively degrade LEV and TC antibiotics when exposed to visible light.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yaping Xing,Ting Wang,Xiaotian Wang,Zhiguo Liu,Zhengfeng Jia,Chuanyu Jin,Jinming Zhen,Ran Zhang
Although two-dimensional MoS 2 exhibits superior properties compared to the bulk, the significant agglomeration and poor conductivity limit the application in energy storage and conversion. In this paper, two-dimensional MoS₂ powders, synthesized using a straightforward ultrasonic method, are employed as the raw material and subsequently self-assembled into three-dimensional MoS₂ through the cross-linking action of dopamine (DA). Utilizing the reduction properties of DA, nano-silver (Ag) is successfully anchored within the layered structure of MoS 2 , which not only enhance conductivity of MoS 2 , but also improve structural stability. Finally, the mixed samples are carbonized to prepare a highly stable and conductive three-dimensional MoS 2 /Ag@C cathode material. In thermal batteries, MoS 2 /Ag@C cathode has a large specific energy of 404.74 Wh kg −1 at 50 mA cm −2 with a cut-off voltage of 1.35 V, which is higher than 26.70 Wh kg −1 of bulk MoS 2 and 107.76 Wh kg −1 of two-dimensional MoS 2 cathodes, respectively. Subsequent studies demonstrate that Ag and pyrolytic carbon enhance the structural stability of the electrode under high-temperature discharge conditions, but also inhibit the interfacial dissolution reaction between MoS 2 and molten salt, ultimately improving the discharge performances.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 8
·2211-2219
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IF 3.307
Qu Fei,Mao Beibei,Xue Fangfang,Xia Lian,You Jinmao,Song Cuihua
In this paper, fluorescent Ag nanoclusters (Ag NCs) templated by hyperbranched polyethyleneimine (PEI) are utilized as a versatile probe through the photoinduced electron transfer (PET) between PEI-Ag NCs and G-quadruplex-hemin complexes. In the presence of hemin and target molecule, the specific conjugation with its aptamer induces the conformational change of the DNA sequence, releasing the G-quadruplex sequence part. Once the G-quadruplex-hemin complexes are introduced, electron transfer from the PEI-Ag NCs to G-quadruplex-hemin complexes occurs, resulting in fluorescence quenching. Through changing the sensing DNA sequence, this novel PET system enables the specific detection of target DNA and adenosine triphosphate (ATP) with the wide linear range of 1–200 nM and 5–500 nM, respectively, and the corresponding limit of detection as low as 0.3 nM for target DNA and 1.5 nM for ATP. In addition, the proposed method is successfully applied to the determination of ATP in human serum samples with satisfactory recoveries, and a logic gate is fabricated using target molecules and hemin as inputs and the fluorescence signal of PEI-Ag NCs as an output.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Wang Yutong,Liang Xiao,Yang Yaling
Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg 2+ ) to metallic mercury (Hg 0 ), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg 2+ in grains. The detection limits were as low as 0.005 μg·L −1 for Hg 2+ and 0.006 μg·L −1 for FB1. Graphical abstract
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TALANTA
·
2024
·
IF 5.6
Yaqin Zhan,Jinru Cao,Ying Wang,Xuesong Li,Yixing Li,Huihui Zeng,Wenyi Huang,Hao Cheng,Si Gao,Lijun Li,Jun Feng
Surface Enhanced Raman Scattering (SERS) has been extensively utilized in therapeutic drug monitoring (TDM) due to its rapid detection speed, high sensitivity and straightforward sample pretreatment. In this study, Au/AgNPs were obtained through the reduction of AgNO 3 on the surface of AuNPs. Subsequently, Au/AgNPs were embedded into the tetrahedral lattice of ZIF-8 MOFs, resulting in the formation of Au/Ag@ZIF-8 nanocomposites. The Au/Ag@ZIF-8 nanocomposites exhibit a robust electromagnetic enhancement of Au/Ag bimetallic nanoparticles and a considerable adsorption capacity of ZIF-8 MOFs. This enables the pre-enrichment of target molecules in the vicinity of the electromagnetic field of the Au/AgNPs, thereby enhancing the sensitivity of SERS detection. The SERS substrate also exhibits high stability and reproducibility, as well as molecular sieving effects, due to the fact that Au/AgNPs are embedded into the tetrahedral lattice of ZIF-8. A TDM method for tacrolimus (FK506) in human serum was developed by using Au/Ag@ZIF-8 nanocomposites as solid phase extraction (SPE) adsorbent and SERS substrates. The results showed that under the optimized conditions, tacrolimus exhibited satisfactory linearity within the concentration range of 10 −5 -10 −11 mol L −1 , with a correlation coefficient (R 2 ) of 0.9944, and the limit of detection (LOD) was as low as 6.4 pg mL −1 . The recoveries were observed to range between 92 % and 105 %, with an RSD of below 8 %. The method is highly sensitive, exhibiting a sensitivity that is 3-6 orders of magnitude higher than that of existing analytical techniques. It has the potential to be applied in a clinical setting to biological samples.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoyan Ma,Huiting Wang,Yaxian Chen,Longfei Fu,Jie Zhou,Ling Zhang,Zhiqiang Xing,Qian Zhang,Lixin Xia
Utilizing hydrothermal synthesis, TiO 2 and g-C 3 N 4 were grown on cotton fabric. Subsequently, Ag NPs were uniformly deposited on their surfaces to produce a Ag@g-C 3 N 4 /TiO 2 cotton fabric substrate (AGTC) with dual-functionalilites of photocatalytic reusability and SERS signal amplification. The introduction of TiO 2 and g-C 3 N 4 nanocomposites significantly enhances the SERS signal on the AGTC substrate for malachite green (MG) detection. The SERS signal on the AGTC substrate is 2.28 times stronger than that on the bare silver-modified cotton fabric, with a reduced detection limit of 6.74 × 10 −13 M. Additionally, the Local Surface Plasmon Resonance (LSPR) effect induced by Ag NPs facilitates electron transfer among substrate components, markedly enhancing photocatalytic capability for degrading organic pollutants under visible light. Consequently, under visible light, the substrate rapidly degrades pollutants and reverts to a reusable state. Experimental results demonstrate the substrate's capability to continuously detect various concentrations and types of target substances, while maintaining high sensitivity. Leveraging the flexibility of cotton fabric, convenient wipe detection and self-cleaning experiments were conducted on the surfaces of different fish species, validating AGTC's outstanding sensitivity in real sample analysis. Therefore, as a flexible and reusable SERS substrate, AGTC exhibits broad potential applications in both SERS detection and photocatalytic degradation of pollutants.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xuechao Xu,Juanli Yang,Guijie Hao,Bo Wang,Tong Ma,Suping Zhu,Lu Gao,Zhen-quan Yang
A multifunctional oxidase-mimicking Ag/Mn 3 O 4 was prepared, catalyzing the 3, 3′, 5, 5′-tetramethylbenzidine (TMB) chromogenic reaction. Six foodborne pathogenic bacteria species, including Escherichia coli , Staphylococcus aureus , Salmonella enterica , Listeria monocytogenes , Bacillus cereus , and Cronobacter sakazakii , were observed to differentially inhibit its oxidase-like activity, resulting in decelerating the TMB chromogenic reaction. Owing to these properties, the following achievements were achieved: colorimetric determination of these bacteria with high sensitivity can be achieved using Ag/Mn 3 O 4 + TMB reaction system; precise identification of these bacteria at different concentrations, including individual bacterium, binary mixtures, and even multivariate mixtures, can be effectively realized by combining the Ag/Mn 3 O 4 -based colorimetric sensor array with principal component analysis (PCA); broad-spectrum inactivation of these bacteria can be remarkably realized through catalyzation of Ag/Mn 3 O 4 to generate superoxide anion free radicals. Therefore, our proposed Ag/Mn 3 O 4 holds significant application potential in the colorimetric determination, precise identification, and broad-spectrum inactivation of foodborne pathogenic bacteria.
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TALANTA
·
2024
·
IF 5.6
Feifan Qi,Mengdie Wu,Simin Liu,Wendi Mu,Chunyan Wu,Xinshui Ren,Chuang Rui,Fangfang Wu,Dong Chang,Hongzhi Pan
Carbohydrate antigen 199 (CA199) is the most sensitive marker reported for pancreatic cancer, and it is a difficult task to develop a highly sensitive assay for CA199. During the experiment, a ratiometric electrochemical immunosensor for quantitative analysis of CA199 was prepared for NiCo@Fc-MWCNTs-LDH as the electrode sensing surface and 3D-rGOF@Ag/Au as the label of Ab 2 . NiCo@Fc-MWCNTs-LDH not only provide the required signal for the immunosensor, but also have a layered structure to obtain a large specific surface area, which can provide more sites for the placement of biological molecules. rGOF has the advantages of large specific surface area and high porosity, which can adsorb Ag electrochemical probe through redox reaction. The modification of gold nanoparticles can not only enhance the electrical conductivity of nano-composites, but also immobilize more biomolecules to improve the sensitivity of electrochemical sensors. With the beefing up of CA199 concentration, the oxidation peak current of Ag increases and the oxidation peak current of Fc-COOH decreases. The ratio (y = I Ag /I Fc-COOH ) of two different signals was linear with the logarithm of CA199 concentration in a certain value range. Under optimal conditions, the immunosensor showed excellent performance in the concentration range of 0.0001 U/mL to 10 U/mL, and the detection limit was 5.55 × 10 −4 U/mL. The strategy could clearly discriminate between matched and mismatched targets, demonstrating high specifificity. This approach further detects CA199 in human plasma to differentiate pancreatic cancer patients from healthy individuals with high accuracy. This method also provided a new idea for the ultrasensitive quantitative detection of other biomarkers.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Kanglin Yu,Yuanyuan Xiao,Shiqi Hu,Xufan Zheng,Bowen Gao,Jingjing Xu,Zongzhe Li,Ruike Zhou,Yaowen Hu,Qingliang You,Biao Xiao,Renqiang Yang
Quantum dot (QD) based luminescent solar concentrator-organic photovoltaic (LSC-OPV) systems demonstrate significant potential in applications including building-integrated photovoltaics (BIPV). In this study, eco-friendly Ag–In–S/Zn–S QDs with a high photoluminescence quantum yield (PLQY = 73 %) are synthesized using a simple hydrothermal method. The influence of Zn-S precursor reactivity on QD properties is studied. The synthesized QDs exhibit excellent stability over a wide temperature range (90–360 K). The Ag–In–S/Zn–S LSCs maintain over 90 % of their initial PLQY after a two-month exposure to natural sunlight. Additionally, the power conversion efficiency (PCE) of the fabricated LSC-OPV system reaches 1.00 % under near-actual condition (9 mW cm −2 ). Moreover, when the irradiation intensity is further decreased to 0.4 mW cm −2 , the LSC-OPV system shows a PCE as high as 5.27 %, demonstrating that the LSC-OPV system can operate efficiently at low illumination intensities. Notably, the fabricated LSCs have minimal impact on the incident sunlight spectrum, making them suitable for BIPV applications. Thus, this study is a first that is known to report the integration of eco-friendly QD-based LSCs with organic photovoltaic cells, which positively contributes to the advancement of BIPV.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yulin Xu,Qin Luo,Lichun Yang,Shenghao Zhang,Yuanbo Huang,Yan Sun,Wei Wei,Min Xie,Yongjun Hu
Sensitive, flexible and rapid SERS substrate for the on-site detection of pesticide residues on the fruit peel is of great significance. In this study, the three-dimensional nanofiber network of bacterial nanocellulose (BNC) serves as a matrix template material in the composite system. The highly antioxidative silver@gold nanoparticles (Ag@Au NPs), featuring a ∼ 45 nm diameter Ag core and an ultrathin ∼2 nm Au shell, were first synthesized via a ligand-assisted complexation approach. Subsequently, these nanoparticles were uniformly incorporated into the bacterial nanocellulose (BNC) matrix through a facile vacuum filtration method to fabricate the flexible Ag@Au NPs-BNC SERS substrate. The prepared flexible SERS substrate achieved an exceptional detection sensitivity of 5 × 10 −9 M for the detection of crystal violet (CV), excellent signal uniformity (RSD = 5.4 %), and exhibited a remarkable SERS enhancement factor of 1.19 × 10 6 . The substrate demonstrated excellent performance for detecting thiram in apple and pear peels, exhibiting a linear dynamic range of 0.1–10 ppm with ultralow detection limits (LODs: 0.0498 ppm and 0.0621 ppm, respectively), and these values are two orders of magnitude below the U.S. Environmental Protection Agency's maximum residue limit (MRL: 5 ppm) for thiram in agricultural products. Remarkably, the substrate maintained stable SERS signal intensity after 57 days of ambient storage, confirming its outstanding long-term stability. The flexible Ag@Au NPs-BNC SERS substrate offers high sensitivity, excellent stability, and reliable detection of trace hazardous chemicals in real applications.
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