CHEMOSPHERE
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2020
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IF 5.778
Lun Wang,Keming Wang,Ruihua Huang,Zhen Qin,Yingchun Su,Shanshan Tong
In the past few years, two-dimensional (2D) nanomaterials have emerged great potential for the removal of valuable metals and the capture of polluted-heavy metals. Herein, hierarchically flower-like microcrystals with 2D WS 2 nanosheets (F-WS 2 MCs) were prepared by one-pot hydrothermal synthesis strategy and its adsorption performances for precious metals were systematically assessed. The excellent adsorption efficiencies of ∼86.8%, ∼27.6%, and ∼94.1% towards Ag (I), Pd (II), and Au (III) respectively were achieved within 120 min, and the adsorption curves were in good agreement with a pseudo-second-order kinetic model showing a fast uptake rate at the optimum pH values (1.30 for Au (III), 1.43 for Ag (I), and 3.20 for Pd (II)). The adsorption isotherm followed well in the Langmuir model with the maximum removal capacities ( q max ) of 186.2 mg g −1 for Ag (I), 67.29 mg g −1 for Pd (II), and 1340.6 mg g −1 for Au (III), respectively. Furthermore, for recycling purposes, the relevant desorption solution was investigated with different ratios of monobasic acid and thiourea , suggesting the best desorption efficiency of 93.03%, 88.08%, and 85.34% for Ag (I), Pd (II), and Au (III), respectively. By characterizing the crystalline phase, and micromorphology element mapping of F-WS 2 MCs before and after adsorption, the strong affinity and significant adsorption–reduction were indicated to dominate the adsorption process. Therefore, this work broadens the application range of WS 2 microcrystals, providing an alternative material for capturing precious metals and wastewater treatment applications.
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BIOMATERIALS
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2020
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IF 10.317
Zihan Mei,Duyang Gao,Dehong Hu,Huichao Zhou,Teng Ma,Liang Huang,Xin Liu,Rongqin Zheng,Hairong Zheng,Ping Zhao,Jianqiao Zhou,Zonghai Sheng
Multidrug-resistant Staphylococcus aureus (MRSA) seriously endanger human health. The development of efficient methods to eliminate the infections and monitor the treatment process are of great significance. Near-infrared-II (NIR-II) photoacoustic (PA) imaging and photothermal therapy (PTT) are highly integrated theranostic platforms with superior performance including a low imaging background, increased tissue penetration depth, and high photothermal threshold. Herein, we report an activatable near-infrared II (NIR-II) phototheranostic strategy using miniature Au/Ag nanorods (NRs) for the photochemical synergistic therapy of MRSA infections and in situ monitoring of the treatment progress. Au/Ag NRs were efficiently activated by ferricyanide solution and allowed to continuously release free Ag + to eliminate MRSA, triggering NIR-II photothermal and PA performance enhancement. The activated NIR-II photothermal effect in turn accelerated the release of free Ag + from Au/Ag NRs for the synergistic elimination of gram-positive Staphylococcus aureus and promoted wound healing. No photothermal damages or free Ag + -induced side effects were observed in treated mice. After synergistic treatment, a 20-fold NIR-II PA signal increase with a maximum signal-to-noise measurement of 9.5 was observed between the implanted site and normal tissue, enabling sensitive monitoring of Ag + release process. The prepared Au/Ag NRs were stable and biocompatible, showing great potential for activatable NIR-II phototheranostic application.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Zhu Lu,Jun Dong,Qingyan Han,Wei Gao,Yongkai Wang,Jihong Liu,Zhongyu Wang,Zeyu Sun,Boyang Wang,Jianxia Qi
Here, we successfully synthesized silver-coated gold nanorods (Au@Ag NRs) via a facile wet chemical method . The catalytic property of Au@Ag NRs in water solution was much better than that of Au NRs in water solution. To obtain high catalytic properties, we self-assembled a single-layer Au@Ag NR array by evaporation on a silicon wafer . The catalytic activity of the Au@Ag NR array was probed using the reduction of 4-nitrothiophenol. The reaction processes were monitored and identified through in situ surface-enhanced Raman spectroscopy based on the confocal Raman microscope system. This study provides a simple and fast method to improve the catalytic property of the noble nanoparticles .
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POLYMER TESTING
·
2020
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IF 3.275
Pingwei Zhu,Ling Weng,Xiaorui Zhang,Xiaoming Wang,Lizhu Guan,Jiahao Shi,Lizhu Liu
A new type of graphene@poly(dopamine)-Ag (Gns@PDA-Ag) core-shell nanoplatelets was designed to improve the dielectric properties of thermoplastic polyurethane (TPU) composites. The microstructure, dielectric performances and the effects of Ag nanoparticles’ content on the dielectric properties of composites were investigated. Results showed that the addition of Gns@PDA-Ag nanoplatelets could effectively improve the dielectric constant of the composite. When tested at low frequency (below 100 Hz), the highest dielectric constant of the TPU/Gns@PDA-0.78Ag (3 wt%) composite was 118.82, which was 14 times higher than that of pure TPU (8.39). This increase in dielectric constant should be attributed to the strong polarization effect of conductive graphene nanoflakes (Gns) and Ag nanoparticles to TPU molecules. The PDA shell could prevent direct contact between Gns and Ag nanoparticles, limit the formation of conductive pathways, which kept the dielectric loss of the composites at a low level and maintained the breakdown strength in a stable state. Compared with pure TPU (0.29), the minimum dielectric loss of composites was only 0.36. Moreover, after Gns@PDA-Ag nanoplatelets with higher Ag content were doped into TPU, the composite showed a higher dielectric constant, and due to the existence of the Coulomb blocking effect, the dielectric loss did not increase significantly. The scalability and simplicity of the described method will provide a promising route to polymer composites for highspeed integrated circuits and energy storage applications.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Feihu Mu,Benlin Dai,Wei Zhao,Shijian Zhou,Haibao Huang,Gang Yang,Dehua Xia,Yan Kong,Dennis Y.C. Leung
To boost the visible light catalytic performance of typical metal-organic frameworks (MOFs) materials (MIL-68(In)-NH 2 ), a novel stable Z-scheme Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 plasmonic photocatalyst was constructed by electrostatic attraction, co-precipitation reaction, and in-situ photoreduction reaction methods for the first time. The photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A (BPA) and reduction of Cr(VI) under visible light. Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 displays the best photocatalytic performance among the as-prepared photocatalysts. The rate constant of BPA degradation on Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 is 0.09655 min −1 , which is better than many reported photocatalytic materials. It also achieved a maximum rate constant of 0.02074 min −1 for Cr(VI) reduction. The boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance (LSPR), effective interface charge transfer and separation, and more reactive sites provided by the large specific surface area. Besides, the photocatalytic degradation pathway of BPA is concluded according to GC-MS analysis. Finally, a more reasonable Z -scheme mechanism is speculated and verified through a series of characterizations and simulations, such as time-resolved photoluminescence spectroscopy (TRPL), electron spin resonance (ESR), and finite difference time domain (FDTD) method.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
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2021
·Vol. 27
·期 3
·655-665
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IF 1.993
Jinyan Hu,Suo Liu,Dingsheng Wu,Dengyu Pan,Quan Feng
As a new advanced oxidation technology, photocatalytic technology has broad application prospects in the field of wastewater treatment. However, in the actual use process, there will be difficulties in catalyst recovery and reuse. This article successfully prepared bacterial cellulose (BC) loaded silver and titanium dioxide nanoparticles (Ag-plated TiO 2 /BC composite pellicle) by in situ embedding method. BC not only works as the carrier to load TiO 2 and Ag NPs but also adsorbs dyes to promote the reaction. As a reusable photocatalytic film, it is convenient to use and recycle in terms of testing and characterization compared with powders. The results show that Ag and TiO 2 nanoparticles were closely embedded in BC. We evaluated the photocatalytic degradation performance of the catalyst on methylene blue (MB), active red X-3B, and Rhodamine B. When the reaction time was 2 h, the dye removal rates were 71%, 68%, and 82.6%. At the same time, through the inhibition zone experiment, it was found that the material has a certain inhibitory effect on both Escherichia coli and Staphylococcus aureus . Therefore, the supported catalyst prepared by this method has the advantages of high catalytic activity, relatively stable property, easy recovery, and tailorability, making it potentially applicable in sewage post-treatment links.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Kaiqiang Wang,Jinjie Li
The fabrication of sensitive and reliable interfacial plasmonic platform for measuring chemical contaminants in various phases is an exciting topic in the food industry and for environment monitoring. In this study, a high-performance surface-enhanced Raman spectroscopy (SERS) analytic platform was developed through self-assembly of the gold@4-mercaptobenzoic acid@silver nanoparticles (Au@4-MBA@Ag NPs) at the cyclohexane/water interface. By addition of the inducer ethanol, the Au@4-MBA@Ag NPs in aqueous phase was effectively migrated to the biphasic interface, forming a large-scale close-packed nanoparticle array. The average gap between adjacent nanoparticles was smaller than 3 nm, where intensive SERS “hot spots” were created for high-sensitive detection. Furthermore, using the sandwiched 4-MBA molecule as the internal standard to correct the Raman signal fluctuations, the point-to-point and batch-to-batch reproducibility of Au@4-MBA@Ag array were improved with lower relative standard deviation (RSD) values of 8.84% and 14.97%, respectively, and pesticides (thiram and thiabendazole) analysis in both aqueous and organic phases were achieved with higher accuracy (R 2 of 0.986 and 0.990) as compared with those without 4-MBA correction (R 2 of 0.867 and 0.974). The high-throughput fabrication of the self-assembled nanoparticle array is a promising approach for development of a sensitive and reliable SERS platform for chemical contaminants monitoring in multiphase.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ying Zhang,Yuanwu Liu,Pengfei Cheng,Weiming Song,Xuyan Zhang,Shiya Rong,Xingsen Gao,Guofu Zhou,Zhang Zhang,Junming Liu
Developing highly-efficient visible-light-driven photocatalyst for water disinfection is an attractive strategy to address the current shortage of safe drinking water and environmental remediation. Since the low dependence on growth substrate and the narrow bandgap nature made ReS 2 one of the best two-dimensional (2D) materials for photocatalytic sterilization. Herein, we fabricated Ag/ReS 2 composite, a 0D/2D heterostructure, which can be grown on three universal substrates through a facile chemical vapor deposition (CVD) and thermal evaporation process. Benefiting from the vertical growth of ReS 2 nanosheets and the hybrid effect from Ag and ReS 2 , the visible-light response of Ag/ReS 2 can be greatly enhanced, exhibiting an excellent photocatalytic antibacterial efficiency towards Escherichia coli ( E. coli ) after 30 min of visible-light exposure, providing a promising environmentally friendly alternative method for water disinfection. Moreover, the universal substrate growth and good stability also endow the photocatalyst with potential applicability in various fields.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Xiuting Li,Hongmei Liu,Chenjie Gu,Jinjie Zhang,Tao Jiang
The acquisition of a robust plasmonic substrate with both appreciable molecule anchoring and quantitative detection features is a prerequisite for the reliable adhibition of surface-enhanced Raman scattering (SERS) technology. Herein, an innovative sophisticated SERS substrate was proposed by spin-coating titanium dioxide (TiO 2 ) onto a flexible polydimethylsiloxane (PDMS) film followed by the modification of triangular silver (Ag) nanoplates through in-situ reduction. The absence of organic surfactants during this process rendered the substrate great opportunity in effectively enriching molecules and the assembly of TiO 2 and Ag made it a reusable and sensitive SERS platform. After a recyclable monitoring of 4-aminothiophenol (4-ATP) with different concentrations was carried out by reusing the hybrid substrate for 8 cycles, a limit of detection as low as 1.58 × 10 −9 M was achieved. The distinctive intrinsic Raman signal from PDMS matrix was further verified to successfully correct the poor detection linearity by serving as internal standard and the coefficient of linear correlation (R 2 ) was improved from 0.967 to 0.997. In this regard, the as-prepared multifunctional PDMS/TiO 2 /Ag hybrid substrate with simulation-estimated electromagnetic “hot spots” exhibited remarkable quantitative recyclable detection performance.
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FOOD CHEMISTRY
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2021
·
IF 7.514
Fanxing Meng,Yanan Qin,Wenrui Zhang,Fei Chen,Li Zheng,Jun Xing,Aihemaitijiang Aihaiti,Minwei Zhang
In this study, a high-performance flexible reduced graphene oxide (rGO) paper electrode composed of silver nanoparticles (Ag NPs) for the detection of Sudan I was fabricated. Ag NPs were doped with rGO nanoheets by self-assemble and assembled into a paper electrode with layer-by-layer structure via vacuum filtration. Thanks to the highly efficient electrocatalysis of Ag NPs towards reduction of azo bond, the as-prepared hybrid paper can be used alone as a flexible sensor for the detection of Sudan I in chili powder, with the high sensitivity (22.93 μA μmol/L) and the low detection limit (41.3 nmol/L). The sensor also expressed good selectivity, repeatability, reproducibility, stability and recovery between 96.1% and 101.8% (RSD < 6%). With the advantages of low-cost and scalable production capacity, such Ag NPs/rGO functional papers can be used as flexible disposable sensors for electrochemical detection of Sudan I.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yiran Tian,Hongmei Liu,Ying Chen,Canliang Zhou,Yong Jiang,Chenjie Gu,Tao Jiang,Jun Zhou
Along with the fast development of synthesis technique of nanomaterial, surface-enhanced Raman scattering (SERS) has emerged as an attractive tool for molecule sensing in the field of food safety and environmental monitoring. In this paper, a novel seedless one-spot strategy was firstly used to synthesize a series of 3D and 2D Ag nanostructures by simply modulating the injection rate of Ag source under different temperature. Through monitoring their morphology evolution under various synthesis conditions, the formation mechanism of these nanostructures was investigated in detail. Especially, the as-prepared 3D hierarchical Ag nanoflowers exhibited superior SERS performance with an enhancement factor of 3.77 × 107 and a limit of detection (LOD) as low as 1.45 × 10-9 M for 2-naphthalenethiol. In addition, the practical SERS-based monitoring of para-aminothiophenol in gas and sodium saccharin in commercial red wine with ultra-low LOD of 7.08 × 10-6 M and 0.0018 mg/mL was subsequently realized using this Ag nanostructure, demonstrating their intriguing prospect in sensitive direct detection of food additives and environmental contaminant.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Haibao Zhang,Guang Li,Xingyou Tian,Lin Chen,Hua Wang,Kang Zheng
Ag nanosheet hierarchical clubbed micro/nanostructured arrays (HCMNs) were prepared through two-step electrodeposition method on an ITO conduction glass coated ZnO seed layer (ZSL), the clubbed arrays were formed by the Ag nanosheets electrodeposited on the ZnO nanorods . Such arrays exhibit excellent surface-enhanced Raman scattering (SERS) performance including high activity and sensitivity, biological solubility and stability, and can be used as SERS substrate for trace analysis and detection of some chemicals. It was proved that their SERS detecting limit of R6G solution can be to10 −12 M, indicating the practical applications based on the SERS effect of noble-metal/semiconduct composite micro/nanostructured arrays.
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