NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 42
·19957-19962
·
IF 3.591
Yan Xu,Xiao-Sheng Yan,Si-Bo Zhang,Shao-Wei Li,Ning-Shao Xia,Tao Jiang,Zhao Li,Yun-Bao Jiang
We report a supramolecular nanosphere with a diameter of 8.65 nm built in an aqueous solution via dynamic binding of glucose to a thiol ligand bearing a phenylboronic acid group, 4-mercaptophenylboronic acid (4-MPBA), as a hydrophilic component in combination with a hydrophobic thiol ligand, 1-octanethiol (n-C8H17SH), in the presence of Ag+. Highly hydrophilic glucose binding to two neighboring boronic acid groups from 4-MPBA ligands on their Ag+ coordination polymeric backbone, on which the hydrophobic n-C8H17SH ligands locate inwards, drives the coordination polymers into nanospheres. The supramolecular nanospheres are of small diameters with narrow size distribution characteristic of glucose among the tested monosaccharides including fructose and xylose.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhen Wang,Shuqi Hu,Asad Ali,Hongling Chen,Pei Kang Shen
The development of highly active and stable catalysts is a critical challenge which affects the practical application of the direct methanol fuel cells. Alloying Pt with other metals is an effective strategy to form the bimetallic or trimetallic catalysts, which not only decreases the consumption of Pt but also optimizes the electronic structure of Pt, in turn enhancing the catalytic activity. Herein, we use a facile one-pot solvothermal reduction method to synthesize Ag nanocubes (NCs) enclosed by PtRh nanoparticles as a trimetallic Ag@PtRhAg NC core–shell catalyst toward methanol oxidation reaction (MOR). Notably, the core–shell structure is formed because of the presence of N,N-dimethylacetamide, which promotes the preferential reduction of Ag by reducing the reduction potential of Ag atoms. Meanwhile, the bromide ions originating from cetyltrimethylammonium bromide controlled the growth of the cubic morphology. Benefiting from the pleated exterior providing more active sites and the synergistic effect between Pt, Rh, and Ag, the mass and specific activities of Ag@PtRhAg NCs are 4.22 and 3.78 times higher than those of commercial Pt/C, respectively. More impressively, because of the better CO tolerance, Ag@PtRhAg NCs display strengthened durability by maintaining 84.9% mass activity after 1000 MOR cycles compared to the initial value. The present work provides a one-step strategy to synthesize a core–shell nanostructure catalyst for enhancing the MOR activity.
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MOLECULES
·
2020
·Vol. 25
·期 19
·4432
·
IF 3.267
Quan Pan,Yuelin Kong,Kuan Chen,Mi Mao,Xiaohui Wan,Xiaoyan She,Qingsong Gao,Yu He,Gongwu Song
In this work, we report the synthesis of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets decorated on zeolitic imidazolate framework-8 (ZIF-8) to form a Cu-Ag/g-C3N4/ZIF hybrid. The hybrid was synthesized and characterized by Transmission electron microscopy (TEM), Fourier transformed infrared (FTIR), the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cu-Ag/g-C3N4/ZIF hybrid has intrinsic peroxidaselike catalytic activity towards the oxidation of TMB in the presence of H2O2. The situ synthesis of Cu-Ag bimetallic nanopartiles on 2D support such as g-C3N4nanosheets would significantly enhance the peroxidaselike catalytic properties of individual Cu-Ag bimetallic nanopartiles and the g-C3N4nanosheets. After loading of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets on the ZIF-8, the hybrids exhibited superior peroxidaselike catalytic activity and good recyclability. Then, this method was applied for detecting glucose in human serum, owing the significant potential for detection of metabolites with H2O2-generation reactions.Keywords:Cu-Ag/g-C3N4/ZIF hybrid;nanozyme;colorimetric detection;H2O2;glucose
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 38
·16526-16536
·
IF 3.288
Xufeng Bai,Ting Ren,Jingbo Mao,Shenmin Li,Jingmei Yin,Jinxia Zhou
Cellulose-derived levulinic acid (LA) can be converted into gamma-valerolactone (GVL), a sustainable platform chemical for the production of bio-based chemicals. However, LA as an organic acid causes severe metal leaching during the heterogeneous hydrogenation of LA to GVL, especially in the presence of water. Various endeavors for preventing metal leaching have focused more on the process and less on the intrinsic nature of catalysts. The aim of this work is to derive a novel metal-leaching-resistant catalyst for the aqueous-phase hydrogenation of LA into GVL by using a nanocomposite containing three components, Ag, ZrO2, and graphene oxide (GO). The AgZrO2GO catalyst without pre-reduction treatment resulted in complete conversion of LA and approximately 100 mol% selectivity to GVL in the aqueous reaction, and metal leaching from the catalyst was completely eliminated. The relationship between the catalytic performance and the distinct physicochemical properties of the catalyst was extensively discussed.
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CHEMOSPHERE
·
2020
·
IF 5.778
LiWei Yang,YaQi Peng,ChengFeng Qian,GuoHua Xing,JiaoJie He,ChuanLiang Zhao,Bo Lai
An easily separation composite, magnetic chitosan@bismuth tungstate coated by silver (MCTS-Ag/Bi 2 WO 6 ), was successfully synthesized by the simple hydrothermal method. Moreover, the MCTS-Ag/Bi 2 WO 6 demonstrated excellent adsorption/photocatalytic removal of Cu(II) in aqueous solution. Adsorption played a leading role in the synergistic reaction. The catalysts were characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects on adsorption of Cu(II) were investigated, which included illumination, pH, and initial concentration. The experimental results showed that the theoretical maximum adsorption capacity of Cu(II) (181.8 mg/g) was achieved under simulated solar light irradiation with the optimal pH value of 6.0, indicating that illumination could enhance the adsorption of Cu(II) by MCTS-Ag/Bi 2 WO 6 . Meanwhile, the composite exhibited desirable adsorption ability of Cu(II) after 5 cycles. The copper ion adsorption fitted well with pseudo-second-order kinetic model and its isotherm followed Freundlich model.
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高影响因子
LANGMUIR
·
2020
·
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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Materials Express
·
2020
·Vol. 10
·期 5
·687-693
·
IF 1.65
Lin Fengping,Fan Min,Liao Yuqin,Wei Xinyu,Huang Jingjing,Zhou Ting,Lu Yudong
Core–shell nano-metal structures as SERS probes have drawn attention and have been applied to detecting analytes at low concentrations. Here, we have developed a novel SERS probe composed of Cu–Ag for the quantitative, rapid and ultrasensitive detection of caffeic acid.
The surface of Cu–Ag was modified with 4-mercaptophenylboronic acid (4-MPBA) to allow the probe to detect caffeic acid, wherein 4-MPBA specifically binds to caffeic acid by an esterification reaction. The results obtained in this work show that the SERS performance of the 4-MPBA substrate
is better than that of the Cu–Ag substrate. To determine the binding of caffeic acid to 4-MPBA, the B-OH stretching vibration at 1170 cm–1 was selected as the representative signal. It was found that there is a linear relationship between the intensity of the peak at
1170 cm–1 and the concentration of caffeic acid.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 23
·7920-7931
·
IF 4.174
Shuang Wang,Yujie Wang,Linghan Li,Lei Li,Guoyuan Fu,Rui Shi,Xinyu Zou,Zhijuan Zhang,Fang Luo
As environmental pollution and energy shortages have become global concerns, the construction of highly efficient catalysts using facile and green methods remains a long-term goal. In the present study, we proposed a facile catalyst preparation method in which Ag/TiO2 composites were coated on the surface of the porous pure inorganic crystalline vanadium phosphates (VPO) by a one-step strategy. More importantly, the in situ reduction of Ag nanoparticles was achieved at room temperature without severe conditions or hydrogen atmosphere in which the porous VPO was employed as the reductant. The prepared Ag/VPO@TiO2 composites act as a class of efficient bifunctional catalysts for visible light photodegradation of MB molecules and catalytic reduction of p-nitrophenol (4-NP). Among these samples, the 6.82%Ag/VPO@TiO2 composite exhibited a superior photocatalytic activity in the degradation of MB and an ultrafast reduction rate for 4-NP of about 0.1 mM/40 s. The photocatalytic mechanistic studies revealed that the encapsulated VPO with a narrow band gap not only efficiently enhances the photosensitivity of the TiO2 but also largely facilitates the photogenerated charge separation. The subsequent deposition of Ag NPs is able to further promote electron transfer ability, which leads to the higher photocatalytic activity. Moreover, the contact of Ag NPs with the surface of semiconductor TiO2 can result in an electron-enhanced area in their interface that could effectively facilitate the uptake of electrons by the 4-NP molecules and then improve the reduction activity.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Jing Tang,Yu Liu,Jiaqi Hu,Shengbiao Zheng,Xuchun Wang,Hongping Zhou,Baokang Jin
Hybridizing nanostructured metal nanoparticles with metal-organic framework is greatly promising for the enhancement of electrochemical performance of sensor. In the present study, an Ag nanoparticles-ZIF-67 nanopinnas composite material (Ag-ZIF-67p) has been fabricated by ultrasonication and reduction of a metal precursor (AgNO 3 ) within ZIF-67 nanopinnas template. The desired Ag-ZIF-67p was characterized by transmission electron microscopy with energy dispersive X-ray analysis and elemental mapping, powder X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. The Ag-ZIF-67p was modified on the GCE and demonstrated enhanced electrocatalytic activity toward dopamine (DA) and acetaminophen (AP) owing to synergetic properties of large porosity and surface area of ZIF-67 and the high conductivity and excellent catalytic activity of Ag nanoparticles. The results revealed broader linear range toward analysis of DA and AP with low detection limit of 0.2 and 0.05 μM (S/ N = 3) for AP and DA, respectively. In addition, this Ag-ZIF-67p modified electrode also showed excellent selectivity for the detection of two compounds and prospective results in real tablets and dopamine hydrochloride injection samples.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuanyuan Du,Hongmei Liu,Ying Chen,Yiran Tian,Xiaoling Zhang,Chenjie Gu,Tao Jiang,Jun Zhou
In the field of SERS-based immunoassay, the recyclable utilization of noble metal materials is essential for their practical application in clinical medicine. Herein, a kind of novel multifunctional Fe 3 O 4 @TiO 2 @Ag microparticles (MPs) was synthesized through a poly-step reaction, and then their feasibility for recyclable label-free SERS-based immunoassay of prostate specific antigen (PSA) was demonstrated. The photocatalytic efficiency of the Fe 3 O 4 @TiO 2 @Ag MPs was fully adjusted by tuning the thickness of the middle TiO 2 shell and the areal density of the outside Ag NPs. Particularly, the Fe 3 O 4 core played a critical role in further improving the photocatalytic activity under external magnetic field. Thereafter, the successfully photocatalytic degradation and recyclable detection of PSA in human serum was confirmed by the change of O 1s, N 1s, and C 1s signals in the XPS characterization and a limit of detection as low as 16.25 pg/mL was realized. Furthermore, the quantitative recyclable detection of PSA in clinical serum samples with prostate cancer was conducted, and the results are basically consistent with those of the traditional chemiluminescent immunoassay, showing small relative deviation less than or equal to 5.7%.
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Materials Today Communications
·
2019
·
IF 1.859
Vu Van Cat,Ngo Xuan Dinh,Le Thi Tam,Nguyen Van Quy,Vu Ngoc Phan,Anh-Tuan Le
In this work, we established a simple and cost-effective method of dispersing silver nanoparticles on the surface GO nanosheets using a one-pot hydrothermal process with the presence of polyvinylpyrrolidone (PVP) as both surfactant and reducing agent. The systematic effects of synthesis conditions on the microstructure and formation of silver nanoparticles on the surface of rGO nanosheets were studied. Notably, the high-crystalline silver nanoparticles with a size of 15 nm were uniformly dispersed on the surface of rGO nanosheets when synthesis conditions were optimized at hydrothermal temperature 160 °C, pH = 9 and 10 mM of silver nitrate precursor. Our analysis results indicate that the as-prepared rGO-Ag nanocomposites exhibit the highest SERS efficiency and good sensitivity with methylene blue organic dye and tricyclazole pesticide. These can be explained by the electron interactions between silver nanoparticles and graphene oxide, which makes unique material advantages for the highly effective detection of pollutant molecules in the environmental monitoring applications.
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NANOTECHNOLOGY
·
2019
·Vol. 30
·期 48
·485401
·
IF 3.399
Zekang Yang,Zipeng Xing,Dechao Chi,Zhenzi Li,Dandan Sun,Xin Du,Junwei Yin,Wei Zhou
Plasmon Ag and co-catalyst CoxP decorated mesoporous graphite carbon nitride nanosheet assemblies have been synthesized via a template-calcination and ball milling strategy combined with photoreduction. The obtained composites are characterized by x-ray diffraction, Fourier transmission infrared spectroscopy, x-ray photoelectron spectroscopy, transmission electron microscopy, and UV–vis diffuse reflectance spectroscopy. The results show that the sample assembly with mesoporous structure has specific surface area of 50.4 m2 g−1, pore size of 11.3 nm and pore volume of 0.21 cm3 g−1. The Ag and CoxP nanoparticles are decorated on the surface of graphite carbon nitride uniformly. Under solar light irradiation, the photocatalytic degradation rate of ceftazidime for the prepared sample assembly is up to ∼92%, and the photocatalytic reaction rate constant is about 10 times higher than that of bare graphite carbon nitride. Moreover, the sample assembly also exhibits a solar-driven photocatalytic hydrogen production rate of 96.66 μmol g−1 h−1. It can attributed to the surface plasmon resonance effect of Ag nanoparticles and CoxP co-catalyst promoting the spatial charge separation and the mesoporous structure providing more surface active sites and favoring mass transfer. This special structure offers new insights for fabricating other high-performance photocatalysts with high spatial charge separation
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