BIOPOLYMERS
·
2020
·Vol. 111
·期 6
·e23354
·
IF 1.854
Xiaolin Xiao,Yuyuan Zhu,Jiexin Liao,Tao Wang,Weixiang Sun,Zhen Tong
Hydrogel dressings have significant advantages such as absorption of tissue exudate, maintenance of proper moist environment, and promotion of cell proliferation. However, facile preparation method and high-efficient antibacterial hydrogel dressings are still a great challenge. In this study, a facile approach to prepare antibacterial nanocomposite hydrogel dressing to accelerate healing was explored. The hydrogels consisted of quaternized chitosan and chemically cross-linked polyacrylamide, as well as silver nanoparticles (AgNPs) stabilized by chitosan. The synthesis of the hydrogels including the formation of AgNPs and polymerization of acrylamide was accomplished simultaneously under UV irradiation in 1 hour without adding initiator. The hydrogels showed favorable tensile strength of ∼100 kPa with elongation at break over 1000% and shear modulus of ∼10 4 Pa as well as suitable swelling ratio, which were appropriate for wound dressing. The combination of quaternized chitosan and AgNPs exhibited high-efficient and synergetic antibacterial performance with low cytotoxicity. In vivo animal experiments showed that the hydrogel can effectively prevent wound infection and promote wound healing. This study provides a facile method to produce antibacterial hydrogel wound dressing materials. Graphical
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11310-11324
·
IF 3.553
Ren Hai-Tao,Han Jing,Li Ting-Ting,Liang Yu,Jing Meng-Zhen,Jiang Si-Meng,Lin Jia-Horng,Lou Ching-Wen
Visible light response PAN@Ag–Ag 2 O/TiO 2 (PAN@AT) nanofibers with different mass ratios between Ag–Ag 2 O and TiO 2 were synthesized via a facile electrospinning technique and pH-induced precipitation reaction. X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscope analyses manifest the formation of Ag–Ag 2 O/TiO 2 heterojunctions, and Ag–Ag 2 O/TiO 2 nanoparticles are evenly distributed on PAN nanofibers. The fabricated nanofibers show a highly photocatalytic performance toward As(III) oxidation under visible light, and the conversion is 92.1% after 120-min reaction at pH 5.0 in the system of PAN@AT4. Furthermore, conversion of As(III) can retain 88.6% of the original activity after repeating four cycles, indicating the good recyclability of PAN@AT4 nanofibers. Quenching experiments and electron spin resonance spectra analysis further demonstrate that the predominate active species for As(III) oxidation by PAN@AT4 are h + and · OH. The enhanced catalytic activity of PAN@AT4 is therefore ascribed to the formation of Ag–Ag 2 O/TiO 2 heterojunctions on PAN surface and the efficient separation of photoinduced electron–hole pairs. This study provides a new material to oxidize reducing pollutants [such as As(III)] and also sheds light on the fabrication of recyclable photocatalysts.
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ANALYST
·
2020
·Vol. 145
·期 8
·3029-3037
·
IF 3.978
Chen Zhao,Xiangyu Kong,Shaomin Shuang,Yu Wang,Chuan Dong
We herein report a simple anthraquinone-imidazole-based compound, 2-(furan-2-yl)-1H-anthra[1,2-d]imidazole-6,11-dione (FAI), as an effective colorimetric and fluorometric Ag+ sensor. In 1,4-dioxane/water (3 : 7, v/v, pH 7.4), FAI could selectively recognize and detect Ag+ ions via significant fluorescence quenching at 606 nm, accompanied by a rapid color change from yellow to orange. FAI exhibited high sensitivity to Ag+ in a linear dynamic range from 0.8–32 μM, with the detection limit of 66 nM. Job's plot analysis and HRMS studies supported the formation of the FAI–Ag+ complex in a ratio of 1 : 1. The in situ generated FAI–Ag+ complex was further utilized as a reversible sensor to detect biothiols (Cys, Hcy, GSH) through a decomplexation reaction, with the detection limit of 89 nM, 174 nM and 208 nM for Cys, Hcy and GSH, respectively. In addition, FAI with low cytotoxicity was efficient in monitoring Ag+ ions and biothiols in living human hepatoma cells SMMC-7721 as demonstrated by fluorescence microscopy imaging.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Weiwei Lu,Yuan Zhang,Jinjin Zhang,Peng Xu
Photoelectrochemical (PEC) reduction of CO2 is a potential way to simultaneously address environmental problems and reduce the energy crisis. However, traditional conversion of CO2 in aqueous solution has serious drawbacks, such as low solubility, slow diffusion, and complicated existing form of CO2 in water, as well as the competitive H2 evolution from reduction of H2O, leading to unsatisfactory conversion efficiency and poor product selectivity. To overcome these problems, in this work, gas CO2 has been directly introduced to a flow cell, in which a membrane cathode assembly with Ag nanocube electrocatalysts is used. It is surprising to find that with this PEC reduction strategy, the product selectivity of CO can be substantially enhanced with the suppression of competitive H2 evolution. The control experiments and theoretical calculations suggest that the facile mass transfer of gas CO2 to the (100) plane of Ag nanocubes electrocatalysts and the suitable photocurrent density may account for such advantages.
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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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ChemNanoMat
·
2021
·Vol. 7
·期 12
·1314-1321
·
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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Polymers
·
2021
·Vol. 13
·期 16
·2812
·
IF 4.329
Meng Zhang,Dong Wang,Nana Ji,Shaoxiang Lee,Guohui Wang,Yuqi Zheng,Xin Zhang,Lin Yang,Zhiwei Qin,Yang Yang
Due to the spread of drug-resistant bacteria in hospitals, the development of antibacterial dressings has become a strategy to control wound infections caused by bacteria. Here, we reported a green strategy for in situ biomimetic syntheses of silver nanoparticles@organic frameworks/graphene oxide (Ag@MOF–GO) in sericin/chitosan/polyvinyl alcohol hydrogel. Ag@MOF–GO was synthesized in situ from the redox properties of tyrosine residues in silk sericin without additional chemicals, similar to a biomineralization process. The sericin/chitosan/Ag@MOF–GO dressing possessed a high porosity, good water retention, and a swelling ratio. The hemolysis rate of the composite was 3.9% and the cell viability rate was 131.2%, which indicated the hydrogel possessed good biocompatibility. The composite also showed excellent lasting antibacterial properties against drug-sensitive and drug-resistant pathogenic bacteria. The composite possessed excellent hemostatic activity. The coagulation effect of the composite may be related to its effect on the red blood cells and platelets, but it has nothing to do with the activation of coagulation factors. An in vitro cell migration assay confirmed and an in vivo evaluation of mice indicated that the composite could accelerate wound healing and re-epithelialization. In summary, the composite material is an ideal dressing for accelerating hemostasis, preventing bacterial infection, and promoting wound healing.Keywords:biomimetic synthesis;hemostasis;antibacterial activity;wound healing
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PubMed
高影响因子
Applied Nanoscience
·
2021
·Vol. 13
·期 2
·1495-1506
·
IF 3.674
Zhang Xian-bing,Hu Ya-ping,Yang Wei,Feng Ming-bao
For the efficient disposal of organic pollutants and Escherichia coli ( E. coli ) in water, Ag-loaded and Pd-loaded ZnO nanofibers (NFs) were prepared through electrospinning (e-spin), followed by the alcohol-thermal method. The NFs were prepared in membrane form to promote their separation, recovery, and reuse in practical applications. The complete decolorizations of three types of dyes (i.e., azo, triarylmethane, and heterocyclic dyes) were observed when the Ag-loaded or Pd-loaded ZnO nanofiber membrane (NFM) was first applied as photocatalyst under 30-min UV irradiation. The characterization of the catalysts and the decolorization performance of dyes both demonstrated that the optimal loading rates of Ag and Pd were 12% and 6%, respectively. Moreover, the 12%-Ag/ZnO NFM displayed excellent recyclability over five cycles than the 6%-Pd/ZnO NFM. The E. coli disinfection test demonstrated that the photocatalytic inactivation rates with the 12%-Pd/ZnO NFM and the 6%-Ag/ZnO NFM were significantly improved under solar or UV irradiation, and hydroxyl radicals (∙OH) was primarily responsible for the antibacterial performance. Therefore, the presented 12%-Ag/ZnO NFM and 6%-Pd/ZnO NFM can be used for the efficient photocatalytic treatment of dyes and E. coli in water.
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ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Hongji Li,Jinyue Zhang,Dandan Wang,Junfu Wang,Wei Jiang,Tianyu Zhou,Chunbo Liu,Guangbo Che
In this study, it presents a novel surface-enhanced Raman scattering (SERS) imprinted membrane to be applied into the detection of trace-level antibiotic in aqueous samples. Graphene oxide- argentum (GO/Ag) composites are chosen as the SERS substrates to fabricate on poly(vinylidene fluoride) (PVDF) membrane surface, increasing the hydrophilia and promoting the sensitivity. The amount of GO is investigated to confirm the optimal concentration. Whereafter, in order to effectively apply into practical sample detection, the technique of molecular imprinting is also introduced to improve the selectivity of SERS membrane. The SERS imprinted membrane (AGP-MIM) is synthesized by the process of two-step precipitation polymerization and applied into the detection of enrofloxacin hydrochloride. The characteristics are adequately investigated and proved that the AGP-MIM can be applied into practical samples detection.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Chentao Hou,Huayang Liu,Mohammad Fahim Bakhtari
In order to solve the problem of tetracycline hydrochloride (TCH) wastewater pollution, a photocatalyst for the efficient utilization of sunlight was proposed. In this work, a new method for the synthesis of three-dimensional flower-like Ag/TiO 2 -{001}/HTiOF 3 photocatalyst was applied, where surface oxygen vacancies can induce Ag nanoparticles (NPs) to disperse on the surface of the photocatalyst, which avoids the aggregation of Ag NPs into large particles. The appropriate mesoporous structure of the photocatalyst makes TCH have a stronger affinity on its surface, which is more conducive to the subsequent photodegradation . Furthermore, the surface plasmon resonance (SPR) of Ag NPs extends the response region of photocatalyst to visible light, and the heterojunction formed with TiO 2 /HTiOF 3 further stimulates the electrons in the oxygen vacancy region and inhibits the recombination of carriers. 10-Ag/TiO 2 /HTiOF 3 showed the best degradation activity (96%) for TCH when the ratio of Ag and TiO 2 -{001}/HTiOF 3 was 10%. In addition, the Ag/TiO 2 -{001}/HTiOF 3 photocatalyst has excellent photocatalytic activity , structural stability and sedimentation performance. The prepared catalyst has practical application prospect.
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JOURNAL OF MEMBRANE SCIENCE
·
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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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiuquan Xu,Songmei Wang,Xiaofeng Yu,Jila Dawa,Dongliang Gui,Ronghui Tang
Photocatalytic inactivation has been proved to be an effective strategy for controlling biohazards. Herein, the novel Ag deposited phosphorus and sulfur co-doped g-C 3 N 4 (PSCN) composites with different Ag content were constructed via a facile calcination combining with biogenic-reduction method for inactivating Escherichia coli ( E. coli ). The detailed characterization results indicated that P and S elements were successfully co-doped into g-C 3 N 4 (CN) lattice and Ag nanoparticles (NPs) were evenly deposited on the surface of PSCN with diameter range of 4–20 nm. The Ag/PSCN at depositing amount of 4 wt% (Ag/PSCN-4) achieved the strongest photocatalytic inactivation along with excellent stability, which could completely inactivate 7.0 log cells of E. coli within 60 min of visible light irradiation. This improved bactericidal performance was mainly attributed to the synergistic effects of P-S co-doped together with Ag deposition, which resulted in the increased visible light utilization, the improved separation and transfer efficiency of photo-induced charge carriers. Moreover, active species trapping experiments revealed that the generated superoxide radicals ( O 2 − ) and holes (h + ) played the significant roles in photocatalytic inactivation process. Our present work presented a promising and environmentally friendly strategy to enhance the photocatalytic capacities of CN based composites for pathogens inactivation.
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