JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Chi Wang,Xiaoxuan Zhao,Jinghui Wu,Xia Yang,Xiaochun Cui,Wenzhe Geng,Zhi Geng,Xianze Wang
Efficient utilization of renewable solar energy is attractive in the membrane separation process of water treatment. In this study, a series of tight reactive hybrid ultrafiltration membranes were fabricated by covalently grafting Ag@NH 2 -MIL-125 nanoclusters on the side chains of a poly(aryl ether sulfone) matrix containing trifluoromethyl and carboxyl groups. Due to the homogeneous introduction of functional nanoreactors with high-efficiency solar photocatalytic degradation ability, the prepared tight hybrid membranes could approach good self-cleaning anti-fouling properties under sunlight irradiation. And the optimal sample exhibited an excellent water flux recovery ratio of 99.1% after irradiated by 10 min simulated sunlight. Additionally, the tight reactive hybrid membranes displayed excellent anti-aging robustness via the use of a fluorine-containing poly matrix, maintaining the stable high pollutant retention rate during the long-term ultrafiltration separation process. This work provided a new strategy to fabricate high-performance solar-driven reactive hybrid membranes for ultrafiltration separation processes.
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高影响因子
ChemNanoMat
·
2021
·Vol. 7
·期 12
·1314-1321
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IF 3.154
Yingjie Liu,Tong Song,Guanggang Gao,Ping Yang
Graphical PtPd-decorated multibranched Au@Ag nano-heterostructures were successfully synthesized by using a seed growth method and chemical reduction method. By adjusting the distribution position of PtPd nanoparticles, the hydrogen evolution performance of the heterostructure is optimized. These electrocatalysts revealed excellent hydrogen evolution reaction under visible and near infrared light due to the structural effect, photoelectric effect, and photothermal effect. PtPd-decorated multibranched Au@Ag nanocrystals (NCs) were synthesized to form heterostructures with enhanced electrochemical performance for water splitting in the visible/near infrared (vis-NIR) light region. Three kinds of heterostructures including PtPd-covered, PtPd-edged, and PtPd-tipped Multi-branched Au@Ag NCs were fabricated by controlling the growth process of PtPd alloy nanoparticles on Au@Ag NCs. PtPd-covered Multi-branched Au@Ag nanocrystal exhibited the best photo-assisted electrocatalytic activity. The initial overpotential under vis-NIR light is 33 mV with a Tatel slope of 101 mV/dec while the overpotential is 150 mV at 10 mA cm −2 . The enhanced catalyst activity is ascribed to samples with heterogeneous structures and changed morphology and composition. In addition, localized surface Plasmon resonance (LSPR) effect from the surface of samples resulted in the effective separation of electron-hole pairs (photoelectric effect). Finally the photothermal effect generated from the absorbance of Au nanostructures in near-infrared light increased the temperature of the catalyst. The synergy of structure, photoelectricity, and photothermal effect endows the catalyst with excellent photo-assisted electrocatalytic activity.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Zenghui Mai,Senqing Fan,Yilin Wang,Jiaojiao Chen,Yu Chen,Ke Bai,Lei Deng,Zeyi Xiao
An Ag@PAN catalytic nanofiber composite membrane has been fabricated by combining electrospinning PAN nanofiber seeding with 2-MI and flowing synthesis. ZIF-8 can be immobilized on the surface of the nanofibers with Zn(NO 3 ) 2 solution flowing through the 2-MI/PAN nanofiber membrane and Ag nanoparticles can be immobilized on the nanofibers with Zn 2+ in ZIF-8 exchanged by Ag + followed with reduction reaction. The characteristics of XRD , XPS , FTIR, TGA, HRTEM , and BET proved the successful immobilization of Ag nanoparticles derived from ZIF-8 on PAN nanofiber. The permeance of the Ag@PAN catalytic nanofiber composite membrane can reach 19,227 L m −2 h −1 bar −1 with Ag nanoparticles immobilization amount of 49.64%. The p -NP conversion reaction is addressed for the catalytic performance of the Ag@PAN catalytic nanofiber composite membrane. The conversion rate of 99% can be achieved under the condition of p -NP concentration of 0.025 mM and membrane flux of 300 L m −2 h −1 . The apparent reaction rate constant of 236.63 min −1 can be achieved by flowing through mode, which is 4-5 orders of magnitude higher than that in a stirred tank reactor with Ag powders as the catalyst. The catalytic performance of the composite membranes has not declined significantly after ten cycles of the catalysis experiment, implied the good repeatability of the Ag@PAN catalytic nanofiber composite membranes.
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Materials Today Advances
·
2021
·
IF 7.579
Yaowen Liu,Siying Li,Wenting Lan,Md Alomgir Hossen,Wen Qin,Kangju Lee
In this study, poly (ε-caprolactone) (PCL)/zein/Ag nanoparticle (AgNP) fibrous membranes were prepared by ultrasonication-assisted electrospinning. The effects of the AgNP content and ultrasonication time on the membrane morphology, chemical structure, biodegradability, mechanical properties, antibacterial/antiviral activity, and air filtration performance were studied. The best-performing membrane (AgNP content = 1% (w/v), sonication time = 30 min) exhibited a bead-on-string morphology, an air permeability of 93.6 ± 1.5 mm s −1 , and the Escherichia coli and Staphylococcus aureus removal efficiencies of 98.1 ± 1.2% and 97.4 ± 2.5%, respectively. In an experiment with E. coli phage, the above-mentioned membrane exhibited a 97.1 ± 2.1% virus removal efficiency after 60 min. The high performance of this bead-on-string membrane for air filtration was ascribed to the low packing density due to the presence of open interconnected beaded airflow channels and small beads.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Shixuan Su,Shanshan Li,Jing Hu,Ting Yu,Lingchen Tao,Fuliang Hu,Yunlei Xianyu
Royal jelly as a functional food has great potential to promote human health. As a unique ingredient in royal jelly, 10-hydroxy-2-decenoic acid (10-HDA) is a vital criterion to evaluate the quality of royal jelly. Current approaches for 10-HDA detection mainly rely on high-performance liquid chromatographic (HPLC), but it requires large-scale equipment and skilled technicians that are costly and time-consuming. Herein, we report a colorimetric sensing strategy for 10-HDA detection based on Ag(I) and tetramethylbenzidine (TMB), a widely used chromogenic reagent. Ag(I) can oxidize TMB to generate oxidized TMB (oxTMB) showing a light-blue color. Due to the chelation with Ag (I), the introduction of 10-HDA can prevent the generation of oxTMB that results in a color fading and a decrease in absorbance. This colorimetric sensing strategy enables highly sensitive detection of 10-HDA with a linear range from 1 μM to 10 μM and a limit of detection of 0.13 μM. More importantly, this 10-HDA assay allows for a visual readout either by a smartphone or the naked eye with low cost, convenience, and rapid response that has been successfully applied for evaluating the quality of royal jelly in actual samples. The sensing strategy developed in this work provides a new colorimetric approach that holds great promise as a point-of-care platform for the food industry.
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Colloid and Interface Science Communications
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2021
·
IF 4.914
Menghui Wan,Haodong Zhao,Zhihua Wang,Xueyan Zou,Yanbao Zhao,Lei Sun
Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical tool, but how to obtain effective and versatile SERS substrates is still a challenge. Herein, a simple and efficient strategy to prepare SERS substrates with ultra-sensitivity, high stability and wide applicability is presented. SiO 2 nanofibrous membranes were prepared by electrospinning and calcination , and modified with Ag nanoparticles . The results show that Ag nanoparticles decorated on SiO 2 nanofibers evenly and tightly through chemical bonding. The as-prepared membranes exhibit high flexibility and thermostability. The electrospun nanofibrous membranes show an ultra-high sensitivity of 10 −11 mol/L (an enhancement factor of 10 7 ) for small molecules, and the lowest detection limit near to 10 −8 mol/L for pesticides thiram . It is also demonstrated that the substrates remain excellent SERS signal stability even after standing for 60 days (intensity decrease only for 21.7%). More importantly, the as-prepared substrates can be performed for quantitative detection of bacteria.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Xing-Yuan Du,Shao-Hua Wu,Xiao-Bin Huang,Jian-Jun Sun
Surface-enhanced Raman scattering (SERS)-based biosensing has strong potential owing to its high sensitivity and good selectivity. In this study, a SERS biosensing platform for microRNA-21 detection was proposed by combining heating-enhanced duplex-specific nuclease (DSN)-assisted target recycling amplification and silver nanocube (AgNC)-based SERS enhancement. The activity of DSN was greatly enhanced by increasing the surface temperature of a heated Au electrode (HAuE) during the DSN-assisted target recycling process, resulting in dramatic miRNA-21 amplification detection. 4-Mercaptobenzoic acid (4-MBA) acting as a Raman reporter was immobilized onto the surface of AgNC to form a AgNC/4-MBA SERS tag with AgNC providing significantly larger electric field enhancement and thus excellent SERS applications compared with conventional silver or gold nanospheres. This enhancement was attributed to the well-known “lighting rod” effect derived from the sharp geometrical feature of the edges and corners of AgNCs. These factors lead to the high sensitivity of the proposed SERS biosensor for the miRNA-21 measurement. A limit of detection of 2.88 fM (S/N = 3) was achieved at an electrode temperature of 55 °C, which was decreased by more than three magnitudes compared with that at 25 °C.
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ANALYTICAL CHEMISTRY
·
2021
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IF 6.986
Li Fu,Xuwen Gao,Shuangtian Dong,Hsien-Yi Hsu,Guizheng Zou
Aqueous electrochemiluminescence (ECL) in the second near-infrared biowindow (NIR-II, 900–1700 nm) was anticipated for ECL evolution and spectral multiplexing. Herein, aqueous and monochromatic ECL with a single emission peak beyond 900 nm was achieved by employing methionine (Met)-capped Au–Ag bimetallic nanoclusters (BNCs) as luminophores and triethanolamine (TEOA) as a coreactant. The Met-capped Au–Ag BNCs with surface-defect-induced PL around 756 nm were water-soluble and synthesized via doping Met-capped Au NCs with Ag in a doping-in-growth way. By extensively exploiting the red-shifting nature of surface-defect-induced ECL to PL and the synergetic-effect-enhanced ECL of BNCs, physically surface-confined Au–Ag BNCs exhibited efficient NIR-II ECL around 906 nm in aqueous medium. A spectrum-based NIR-II ECL immunoassay around 915 nm was also achieved by immobilizing the Au–Ag BNCs onto an electrode surface via forming a sandwich immunocomplex, which could selectively determine CA125 from 5 × 10–4 to 1 U/mL with a detection limit of 5 × 10–5 U/mL (S/N = 3). The combined strategy of surface-defect-induced ECL and synergetic-effect-enhanced ECL would enable promising biorelated application of NIR-II ECL.
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PubMed
高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 8
·e17252
·
IF 3.993
Hu Li,Zisheng Zhang,Guanlun Sun,Suli Liu,Liangcheng An,Xingang Li,Hong Li,Xin Gao
As an attractive alternative technology for the separation of long chain olefin and paraffin, a novel silver-based deep eutectic solvent (Ag-DES) was prepared and utilized for 1-octene/n-octane separations. Comprehensive reactive extraction separation experiments were performed to highlight the Ag-DES concentration and operating temperature discriminations using compounds with different ratio of 1-octene/n-octane. The novel Ag-DES showed optimal separation performance regarding 1-octene/n-octane and possessed the highest levels separation selectivity in the range 3.57–16.11 with excellent circulation stability in our best knowledge. Furthermore, FT-Raman measurements and quantum chemistry calculation were performed to elucidate the interaction mechanism of Ag-DES in the separation of 1-octene and n-octane, which revealed that both chemical complexation and strong physical attraction existed in the complex of Ag-DES and 1-octene rather than n-octane. A practical process was proposed for the separation of olefin and paraffin, which indicates that an advanced separation technology could largely reduce the energy consumption. This study lends important insight for the development of Ag-DES reactive extraction separation process for the energy-efficient long chain α-olefins purification from F-T synthesis products.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Hao Wen,Saleem Raza,Ping Wang,Ziyi Zhu,Jiayan Zhang,Wei Huang,Lizhu Liang,Hao Hu,Libo Deng,Changkun Liu
The development of multifunctional super hydrophobic cotton materials for oil–water separation and biological activities has attracted significant research interest. In the present study, a robust, fluorine-free, durable and recyclable modified cotton fabric was created by graft polymerization and coating techniques . The surface was grafted with poly(glycidyl methacrylate) (PGMA), subsequently aminated with diethylenetriamine (DETA), and then immobilized with Ag to obtain CF@GMA@DETA(Ag). Moreover, Polydimethylsiloxane (PDMS) was coated on CF@GMA@DETA(Ag) for super hydrophobicity to obtain the modified cotton fabrics (CF@GMA@DETA(Ag)/PDMS). The water contact angle (WCA) reached 155° ± 1.5°. The modified cotton material had excellent oil–water separation efficiency. Meanwhile, the modified cotton material also has outstanding recyclability and stability. With Ag modification, the modified cotton material also showed impressive antibacterial properties. Furthermore, oil–water separation efficiency was generally higher than 97% in artificial seawater, which offers a possible application to separate oil and water in seawater. These properties render the as-prepared cotton fabric a promising material with potential applications.
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Catalysts
·
2021
·Vol. 11
·期 6
·661
·
IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
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JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Deshan Cheng,Yali Zhang,Changwang Yan,Zhongming Deng,Xiaoning Tang,Guangming Cai,Xin Wang
Surface-enhanced Raman scattering (SERS) spectroscopy as an effective method in sensitive detection applications has attracted more and more attentions recently. In this work, polydopamine was taken to achieve the modification of PET film surface for in-situ growth of three-dimensional (3D) ZnO/Ag nanocomposites. Ag nanoparticles on cluster-like ZnO nanorods surface were applied as Raman hot spots for target molecules detection. SEM, XPS, and XRD were used to characterize the microstructures and morphologies of 3D SERS substrates. pATP molecules were selected to measure the sensitivity, uniformity, and durability, the surface-enhanced enhancement mechanism of Raman scattering was analyzed by finite difference time domain (FDDT) simulation method. Malachite green (MG) was further used as the demonstrative pesticide residue, and the catalytic activity was studied by the deoxidization of 4-nitrophenol (4-NP). This work has indicated that SERS substrates exhibited the advantages of facile fabrication process, low cost, high sensitivity, good stability and excellent uniformity, which can be used for the rapid Raman enhanced spectroscopy analysis of environmental pollutants.
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