LANGMUIR
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2020
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IF 3.557
Renxuan Liu,Ying Hou,Shangjun Jiang,Bei Nie
We report a facile approach to fabricate an Ag-embedded fullerene (C60) catalyst by the chemical reduction of the AgNO3 complex encapsulated fullerene microcrystal, which showed an enhanced catalytic reduction of 4-nitrophenol because of the strong absorption and propagation of H2 along the fullerene surface. With the aid of visible-light radiation, photodegradation of orange G dye is achieved through the formation of an electron donor–acceptor dyad between plasmon Ag nanostructures and fullerene molecules, which effectively offsets the “electron–hole” recombination. Neither Ag nanoparticle nor fullerene crystal used in isolation could perform this chemical conversion, implying that the metal–fullerene hybrid structure is imperative for performing the catalytic reaction. The obtained Ag-embedded fullerene crystal is characterized by scanning electron microscopy (SEM), associated energy-dispersive X-ray spectroscopy (EDX) imaging, and X-ray photoelectron spectroscopy (XPS) and demonstrates that the present hybrid materials would add a supplemental member to a family of photocatalysts toward the organic synthesis and wastewater remediation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
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IF 14.229
Wei Li,Xiao Wang,Min Li,Shu-ao He,Qiong Ma,Xuechuan Wang
Hydrogen is known as an alternative new energy for its advantages of non-pollution and high calorific value, and photocatalysis technology is regarded as one of the most effective means to produce hydrogen in recent years. In this topic, aiming at the poor photoresponse, fast combination of photo-induced carriers and unstable structure of traditional photocatalysts, the three-dimensional porous g-C 3 N 4 /graphene oxide framework was constructed by compounding two-dimensional graphene oxide and two-dimensional g-C 3 N 4 via hard template (SiO 2 nanoparticles) method and selective chemical etching. Then, silver bromide nanoparticles , a superior photosensitizer, were immobilized on the three-dimensional porous framework to construct the three-dimensional porous g-C 3 N 4 /graphene oxide-AgBr photocatalyst with Ag plasmas by solvothermal method. Research showed that this novel photocatalyst based on Z-scheme heterostructure (GO-AgBr), p-n heterostructure (g-C 3 N 4 -AgBr) and Ag plasmas presented high-efficient visible-light driven hydrogen evolution (3.69 mmol/g/h) at the absence of Pt co-catalyst, which is higher than the majority of existing catalysts, and it also possessed strong stability on its activity and structure. Accordingly, the enhanced hydrogen evolution and photostability were attributed to the highly ordered structure and fast interfacial electron conduction of three-dimensional porous framework, superior photosensitivity of AgBr and synergistic effect of Ag plasmas. Therefore, this study provided a potential method for exploitation of hydrogen energy.
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JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·339-345
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IF 1.947
Zuo Guihong,Wang Anqi,Yang Ying,Huang Hailiang,Wang Fangbiao,Jiang Hongwei,Zhang Lei,Zheng Youjin
Recently, Ag/AgCl has been widely researched by various methods and used as photocatalyst to degrade organic dyes due to its excellent photocatalytic properties under visible light. In this paper, a novel visible-light-driven plasmonic photocatalyst Ag/AgCl@ZIF-8 was successfully prepared by depositing AgCl nanoparticles into the ZIF-8 crystals, and then reducing partial Ag + ions of AgCl nanoparticles to Ag 0 species under UV light irradiation. All as-synthesized samples were characterized by XRD, SEM, TEM, BET and UV–Vis diffuse reflectance spectra. The photocatalytic activity of all as-synthesized samples was evaluated by degradation RhB solution under visible light irradiation. The results show that AgCl nanoparticles are well dispersed and inlaid in the body of ZIF-8 crystals, and partial Ag + ions of AgCl nanoparticles are reduced into Ag 0 species after 30 min of UV light irradiation.The as-synthesized Ag/AgCl@ZIF-8 keeps the high surface area of ZIF-8 and holds the excellent photo-properties of Ag/AgCl. The photocatalytic activity of all as-synthesized sample were evaluated by degradation RhB solution under visible light irradiation. Ag/AgCl@ZIF-8 exhibited the highest photocatalystic activity, which could degrade 99.12% RhB. The synergistic effect of Ag/AgCl and ZIF-8 makes Ag/AgCl@ZIF-8 possible to be used for the degradation of organic dye by using sunlight.
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MATERIALS & DESIGN
·
2022
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IF 9.417
Yanqing Xue,Qitang Hao,Xinlei Li,Han Zhang,Peiqing Wang,Chengze Yin,Bo Li,Xinliang Wang
The strength-ductility trade-off severely limits the extensive application of particle-reinforced aluminum matrix composites mainly owing to the critical issues of local particle agglomeration and poor interfacial characteristics. The present work concentrates on these intractable puzzles and proposes Mg-Ag microalloying TiB 2 /Al-4.5Cu composites fabricated by an optimized salt-metal reaction method and multistage heat treatment. The resulting microstructure evidence that this new tactic synergistically ameliorates the detrimental agglomeration of TiB 2 particles by Mg and Ag doped at the TiB 2 /α-Al interface， meanwhile promoting the formation of nanosized Ω-Al 2 Cu and σ-Al 5 Cu 6 Mg 2 phases. The mechanical property experimental results indicate that the Mg-Ag microalloyed TiB 2 /Al-4.5Cu composites exhibit an accredited combination of the tensile strength (ultimate tensile strength is 496.3 ± 15.0 MPa) and ductility (uniform elongation is 12.8 ± 1.4 %). We emphasize the reciprocal effect between TiB 2 particles and the precipitated phase associated with unrelaxed misfit strains. Close attention is also paid to the interface binding characteristics and semi-coherent interphase boundary to evaluate their contribution to the ductility. The microalloying strategy can potentially be applied to many other metal matrix composites and boost analogous approaches for designing ultrahigh yet ductile materials for technological applications.
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Xiutian Guo,Jiale Yao,Fengxian Ji,Rui Wang,Longyun Hao
In this study, a stable silver@polypyrrole (Ag@PPy) composite was prepared with the help of sodium dodecyl sulfate (SDS) and polymerizable surfactant ammonium allyloxynonylphenol ethoxylate (DNS-86). It was then combined with polyurethane acrylate (PUA) to prepare a conductive ink and applied on the surface of cotton fabric. By an energy-saving and sustainable UV curing method, the ink was effectively fixed to fabricate flexible and durable textile. The effects of DNS-86 on the properties of Ag@PPy composite were investigated and the results showed that DNS-86 could reduce its size, make its distribution more uniform and improve its stability. Then, the effects of DNS-86 on the performance of conductive coating on fabric were analyzed by measuring the resistance and water contact angle, revealing that DNS-86 could participate in the UV film-forming reaction of PUA molecules, so as to optimize the film structure for higher conductivity. Finally, the effect of DNS-86 on the flexibility and durability of conductive coating were evaluated. The results indicated that DNS-86 could improve the structural integrity and toughness of PUA film, enhance the adhesion between conductive coating and cotton surface, and make it more resistant to various environmental erosions.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Kunfeng Xue,Bingyong Lin,Qiukai Tang,Yuanyuan Yao,Yueliang Wang,Lifen Chen,Zuguang Li,Yanbo Zeng,Lei Li,Longhua Guo
Establishing a simple, sensitive, and accurate α-fetoprotein (AFP) detection methods is of great significance for the early diagnosis of hepatocellular carcinoma (HCC). Surface-enhanced Raman spectroscopy (SERS) has been identified as one of the most promising techniques for clinical monitoring. However, accurate detection of AFP is still challenging due to the poor stability of SERS substrate and the low abundance of AFP in the early stages of HCC. Herein, we developed an ultrasensitive and highly stable paper-based 3D SERS immunoassay array for AFP detection, combining the superior advantages of self-assembled AuNBPs@Ag nanorods, filter paper, and sandwich immunoassay. In the immunoassay array, 4-mercaptobenzoic acid (4-MBA) linked to the secondary antibody was employed as the Raman reporter, while the array modified with antibodies was used to capture AFP. The SERS immunoassay array sensor exhibited a wide linear range (3 pg mL −1 to 10 µg mL −1 ), low detection limit (0.086 pg mL −1 ), good specificity, and high signal reproducibility (RSD < 5 %). Meanwhile, the sensor is further used for accurate detection of trace AFP in serum, which paves an avenue for the fabrication of SERS substrates with high stability and provides a new outlook for their application in the early diagnosis of cancer.
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VIBRATIONAL SPECTROSCOPY
·
2023
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IF 2.5
Xiaojun Wen,Jumei Li
In this study, we coatedmagnetic Fe 3 O 4 nanospheres with a crystalline mesoporous TiO 2 (mTiO 2 ) layer with photocatalytic activity, followed by the deposition of Ag nanoparticles as an outer layer through in-situ reduction of AgNO 3 to obtain multifunctional Fe 3 O 4 /mTiO 2 /Ag core-shell-shell structured composites. By adjusting the amount of AgNO 3 , we were able to precisely control the size and coverage of the Ag nanoparticles. To evaluate the surface-enhanced Raman spectroscopy (SERS) activity of the Fe 3 O 4 /mTiO 2 /Ag composites, we employed 4-mercaptobenzoic acid (4-MBA) as a model Raman reporter. The limit of detection (LOD) of 4-MBA was down to 10 −10 M. Moreover, for practical applications, we successfully detected methylene blue (MB) in different water samples, such as tap water and industrial wastewater, and both of systems presented an ultralow LOD of 10 −9 M. Notably, a strong linear relationship (R 2 ≥ 0.95) between the SERS intensities and the logarithmic concentration of MB was observed, highlighting the excellent quantitative sensing capabilities of these substrates. The Fe 3 O 4 /mTiO 2 /Ag composites also exhibited remarkable signal reproducibility and exceptional stability during storage. Additionally, these composites demonstrated promising photocatalytic property. In five consecutive cycles, we were able to efficiently detect MB by utilizing the composites' photocatalytic removal ability under UV irradiation , which was facilitated by simple magnetic separation. These findings hold significant importance for environmental safety and pollutant removal applications.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Ye Yang,Fangbo Zhao,Liu Yang,Jiaming Zhang,Hee-Deung Park,Zhiguo Li,Hongxu Chen,Ximeng Zhang,Mingjin Gao
Most ultrafiltration (UF) membranes can hardly remove organic pollutants with low molecular weight, like Bisphenol A (BPA). This study effectively addressed the issue by immobilizing the GO-Ag nano-sheet catalyst within the finger-like pores of a polymer UF membrane using bottom cross-flow filtration. The catalytic membrane operated under a low pressure of 0.2 MPa and achieved a remarkable water flux of 368 L/(m 2 ·h). By filtering aqueous substrates with BPA and humic acid (HA), the UF membrane could effectively reject most of the high molecular weight HA (>90.8%). The BPA entered the membrane pores could be effectively decomposed (>99.4%) by the free radicals generated by the peroxydisulfate(PDS)/GO-Ag system. Also, the catalytic membrane exhibits significantly enhanced BPA degradation kinetics, up to 19.6 times higher than those of conventional suspension-based methods. Moreover, the GO-Ag catalytic membrane demonstrates excellent reusability, maintaining almost constant flux after multiple cycles with a flux recovery rate (FRR) of 90.1%. This is attributed to the in-situ degradation of pollutants attached to the membrane by the free radicals. In addition, it is proved that the GO-Ag catalytic membranes show significant antibacterial abilities. In summary, the GO-Ag/PES catalytic membrane offered significant advantages, such as a convenient fabrication process and the integration of membrane separation and advanced oxidation processes (AOPs) in a single step, eliminating pollutants quickly, saving catalysts and oxidants, and minimizing membrane fouling.
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FOOD CHEMISTRY
·
2023
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IF 8.8
Zhiyang Chen,Yue Sun,Jiyong Shi,Wen Zhang,Xinai Zhang,Xiaowei Hang,Zhihua Li,Xiaobo Zou
The goal of food safety supervision is to directly identify the pesticide residues on the surface of fruits and vegetables. This study proposed to develop a facile, non-destructive, and sensitive method based on surface-enhanced Raman scattering (SERS) to detect non-systemic pesticides on the surface of fruits and vegetables. The composite material was prepared by loading CTAB guided Au@Ag NRs with positive charge onto filter paper which was modified with PDADMAC(+) and PSS(−) using electrostatic adsorption. Au@Ag NRs with bimetallic synergies were effectively adsorbed in the fiber grid to generate 3D SERS hotspots within a few microns of depth. The results showed that the 3D composite flexible substrate had a high SERS activity, great repeatability, and sensitivity when the method was utilized to detect 4-MBA, methyl-parathion, thiram and chlorpyrifos. Three kinds of non-systemic pesticides on the peel could be detected directly and quickly owing to the arbitrary bending of the substrate, demonstrating the efficiency of the SERS “paste-reading” method. The acquired findings demonstrated that PDADMAC/PSS/Au@Ag NRs composite filter paper had the potential to provide rapid feedback for in- situ analysis of pesticide residues on the surface of fruit and vegetable.
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Analytical Methods
·
2023
·Vol. 15
·期 26
·3251-3258
·
IF 3.1
Feifei Li,Congcong Hu,Wenen Su,Hao Liang,Fubing Xiao,Jinquan Liu,Yan Tan,Shengyuan Yang
L-Cysteine, widely used in medicine and the food industry, is of great essentiality to organisms and the food quality. Given that current detection approaches require exacting lab conditions and tedious sample treatment, there is a pressing demand for developing a method that possesses advantages of user friendliness, prominent performance, and cost-effectiveness. Herein, a self-cascade system was developed for the fluorescence detection of L-cysteine based on the ingenious performance of Ag nanoparticle/single-walled carbon nanotube nanocomposites (AgNP/SWCNTs) and DNA-templated Ag nanoclusters (DNA-AgNCs). The fluorescence of DNA-AgNCs could be quenched on account of the adsorption of DNA-AgNCs on AgNP/SWCNTs by π–π stacking. With the cooperation of Fe2+, AgNP/SWCNTs with oxidase and peroxidase-like activities could catalyze the oxidation of L-cysteine to produce cystine and hydrogen peroxide (H2O2) and then break the O–O bond of H2O2 to generate a hydroxyl radical (·OH), which could cleave the DNA strand into different sequence fragments which subsequently peeled off from the AgNP/SWCNTs, resulting in a “turn-on” fluorescence response. In this paper, AgNP/SWCNTs with multi-enzyme activities was synthesized enabling the reaction to proceed in just one step. The successful preliminary applications for the L-cysteine detection in pharmaceutical, juice beverage, and serum samples indicated that the developed method exhibited great potential in medical diagnosis, food monitoring, and the biochemical field, which also broadened the horizon for follow-up research.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qing Huang,Xiaokun Li,Suxiang Feng,Wenfeng Zhuge,Jinyun Peng,Xiaoting Li
Ag nanoparticles functionalized with poly-acid chrome blue K and graphene (Ag-poly-ACBK@Gr) were successfully fabricated on the surface of a glassy carbon electrode using layer-by-layer electropolymerization. The surface structure of the synthesized modified glassy carbon electrode was characterized by scanning electron microscopy. The electrochemical behaviours of diclofenac sodium (DS) at the Ag-poly-ACBK@Gr-modified electrode were investigated by cyclic voltammetry and differential pulse voltammetry. It was found that the prepared sensor exhibited a cathodic peak at 0.78 V with higher peak current response compared to the related modified electrodes. Under optimal conditions, the sensor for the determination of DS exhibits a good linear relationship between the peak current and DS concentration in the range from 0.1 to 40 μM, and the equation is Ip (μA) = 7.23 × 10 3 c (μM) + 3.46 × 10 -2 (R = 0.9955) with the estimated limit of detection of 34.2 nM (S/N = 3). The Ag-poly-ACBK@Gr-modified glassy carbon electrode with high sensitivity and excellent stability and selectivity was successfully applied to detect DS in real drugs and human urine at the recoveries ranging from 99.60 to 101.84%.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanting Dou,Zhiman Liang,Zhenhe Xu,Yuanjin Wang,Jiqi Zheng,Dongling Ma,Yu Gao
Photocatalysis is considered a promising technology to alleviate the energy crisis and environmental pollution; however, developing photocatalysts with improved light absorption efficiency is still a challenge. In this work, an effective strategy was proposed to synthesize a highly functional ternary nanocomposite (g-C3N4/RGO/AZIS) by coupling broader light-absorbing Ag-doped ZnIn2S4 (AZIS) nanoplates with ultrathin g-C3N4 and reduced graphene oxide (RGO) nanosheets. The 2D-on-2D stacking nanostructure of the composite provides a compact heterojunction, enlarged interfaces, and enriched active sites, resulting in the accelerated separation and relocation kinetics of charge carriers. Benefiting from these advantages, the g-C3N4/RGO/AZIS nanocomposite with systematically optimized contents of RGO and AZIS can serve as an efficient bifunctional photocatalyst for both H2 production from water splitting and methyl orange (MO) photodegradation under the irradiation of visible light. The H2 production rate of the ternary nanocomposite is 658.5 μmol h–1 g–1, which is 38 times higher than that of plain g-C3N4. The operation mechanism is proposed based on the results of scavenger tests and photoelectrochemical analysis. The formation of a type-II heterostructure between AZIS nanoplates and g-C3N4 nanosheets along with RGO with lower potential can maximize the separation efficiency of photogenerated electron–hole pairs and decrease the charge recombination. This work provides a viable strategy to develop bifunctional photocatalysts with enhanced performance for both H2 production and degradation of organic dyes.
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