JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Ting Liu,Jiang Xue Dong,Shi Gang Liu,Na Li,Shu Min Lin,Yu Zhu Fan,Jing Lie Lei,Hong Qun Luo,Nian Bing Li
A stable silver nanoparticles/carbon quantum dots (Ag/CQDs) composite was prepared by using CQDs as reducing and stabilizing agent. The CQDs synthesized with polyethyleneimine (PEI) showed an extraordinary reducibility. When Hg 2+ was presented in the Ag/CQDs composite solution, a color change from yellow to colorless was observed, accompanied by a shift of surface plasmon resonance (SPR) band and decrease in absorbance of the Ag/CQDs composite. On the basis of the further studies on TEM, XPS and XRD analysis, the possible mechanism is attributed to the formation of a silver-mercury amalgam. Hence, a two dimensional sensing platform for Hg 2+ detection was constructed upon the Ag/CQDs composite. Based on the change of absorbance, a good linear relationship was obtained from 0.5 to 50 μM for Hg 2+ . And the limit of detection for Hg 2+ was as low as 85 nM, representing high sensitivity to Hg 2+ . More importantly, the proposed method also exhibits a good selectivity toward Hg 2+ over other metal ions. Besides, this strategy demonstrates practicability for the detection of Hg 2+ in real water samples with satisfactory results.
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ANALYTICAL CHEMISTRY
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2017
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IF 6.32
Bingzhi Li,Lei Xu,Yue Chen,Wanying Zhu,Xin Shen,Chunhong Zhu,Jieping Luo,Xiaoxu Li,Junli Hong,Xuemin Zhou
Transcription factors (TFs) regulate gene expression by binding to regulatory regions, and their dysregulation is involved in numerous diseases. Thus, they are therapeutic targets and potential diagnostic markers. However, widely used methods for TFs detection are either cumbersome or costly. Herein, we first applied DNA-Ag nanoclusters molecular beacons (AgMBs) in TFs analysis and designed an assay based on the switchable fluorescence of AgMBs. In the absence of TFs, a single-stranded DNA functioned as a reporter is released from a double-stranded DNA probe (referred as dsTFs probe) under exonuclease III (Exo III) digestion. Then, the reporter triggers downstream Exo III-assisted signal amplification by continuously consuming the guanine-rich enhancer sequences in AgMBs, resulting in significant fluorescent decrease eventually. Conversely, the presence of TFs protects the dsTFs probe from digestion and blocks the downstream reaction to keep a highly fluorescent state. To testify this rationale, we utilized nuclear factor-kappa B p50 (NF-κB p50) as a model TFs. Owing to the amplification strategy, this method exhibited high sensitivity toward NF-κB p50 with a limit of detection of 10 pM, and a broad linear range from 30 pM to 1.5 nM. Furthermore, this method could detect multiple TFs in human colon cancer DLD-1 cells and reflect the variation in their cellular levels after stimulation. Finally, by conducting an inhibition assay we revealed the potential of this method for screening TFs-targeted drugs and calculating the IC50 of corresponding inhibitors.
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ANALYST
·
2016
·Vol. 141
·期 20
·5864-5869
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IF 4.033
Ningning Zhou,Guowen Meng,Zhulin Huang,Yan Ke,Qitao Zhou,Xiaoye Hu
This report presents a simple and inexpensive fabrication approach to a flexible transparent composite film as a “cut-and-paste” surface-enhanced Raman scattering (SERS) substrate for in situ detection of organic pollutants. First, a self-assembled monolayer of Ag-nanocubes (Ag-NCs) is obtained at the air/water interface. Then, the Ag-NC monolayer is retrieved onto a flexible transparent polyethylene (PE) film to achieve an Ag-NC@PE composite film as a flexible SERS substrate. As the Ag-NCs in the monolayer are closely and uniformly packed on the PE film, the Ag-NC@PE composite film shows high SERS-activity with good signal homogeneity and reproducibility. Furthermore, the flexible transparent Ag-NC@PE composite film is “cut into” small pieces and directly “pasted” onto contaminated fruits for in situ SERS detection, as a result 10 nM thiram, 1 μM 4-polychlorinated biphenyl and 10 nM methyl parathion contaminants on oranges are detected, respectively. Therefore the Ag-NC@PE composite film is an inexpensive and effective SERS substrate for rapid in situ detection of organic pollutants in aqueous solutions, on fruits and other solid objects.
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JOURNAL OF LUMINESCENCE
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2016
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IF 2.693
Hailun Wang,Weiju Zhu,Min Fang,Ying Xu,Cun Li
L-Glutathione (GSH) capped CdTe quantum dots (QDs) (GSH@CdTe QDs) have been successfully synthesized. GSH@CdTe QDs could selectively detect Ag + by fluorescence emission spectrometry in aqueous medium. The fluorescence intensity of GSH@CdTe QDs linearly increased upon increasing concentrations of Ag + . The detecting limit of Ag + was found to be 1.3 nM calculated from the linear concentration range of 0.02-0.2 μM. The other foreign mental ions displayed no significant response revealing good selectivity of the sensors towards Ag + . The experimental results indicated the GSH@CdTe QDs were well applied as fluorescence sensor to detect Ag + in aqueous with high sensitivity and selectivity. Furthermore, it was found that the enhancement of fluorescence intensity arose from the formation of Ag 2 Te which modified the surface traps on GSH@CdTe QDs.
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ELECTROCHIMICA ACTA
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2017
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IF 4.798
Zhi Liang Zhao,Qi Wang,Lian Ying Zhang,Hong Ming An,Zhou Li,Chang Ming Li
Development of an inexpensive high performance catalyst with low Pt loading remains a great challenge. Herein galvanic exchange-formed ultra-low Pt loaded porous Ag-Pd binary alloy nanotubes (Pt/Ag-Pd) was prepared as a catalyst toward oxygen reduction reaction (ORR). With highly dispersed active but ultra-low Pt atoms (Pt: about 5.8 wt%) on the porous binary alloy surface, the Pt/Ag-Pd catalyst increases mass activity toward ORR by 1.82 times than commercial Pt/C while possessing excellent operation stability. The performance enhancement is mainly attributed to the unique porous Pt shell/Ag-Pd core tubular structure for increased active sites and facilitated interfacial electron transfer rate by a unique Ag-Pd jointly modified electronic structure. This catalyst holds great promise for practical applications in low temperature fuel cells.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2013
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IF 5.257
Su-juan Yu,Yong-guang Yin,Jing-bo Chao,Mo-hai Shen,Jing-fu Liu
The fast growing and abundant use of silver nanoparticles (AgNPs) in commercial products alerts us to be cautious of their unknown health and environmental risks. Because of the inherent redox instability of silver, AgNPs are highly dynamic in the aquatic system, and the cycle of chemical oxidation of AgNPs to release Ag+ and reconstitution to form AgNPs is expected to occur in aquatic environments. This study investigated how inevitable environmentally relevant factors like sunlight, dissolved organic matter (DOM), pH, Ca2+/Mg2+, Cl–, and S2– individually or in combination affect the chemical transformation of AgNPs. It was demonstrated that simulated sunlight induced the aggregation of AgNPs, causing particle fusion or self-assembly to form larger structures and aggregates. Meanwhile, AgNPs were significantly stabilized by DOM, indicating that AgNPs may exist as single particles and be suspended in natural water for a long time or delivered far distances. Dissolution (ion release) kinetics of AgNPs in sunlit DOM-rich water showed that dissolved Ag concentration increased gradually first and then suddenly decreased with external light irradiation, along with the regeneration of new tiny AgNPs. pH variation and addition of Ca2+ and Mg2+ within environmental levels did not affect the tendency, showing that this phenomenon was general in real aquatic systems. Given that a great number of studies have proven the toxicity of dissolved Ag (commonly regarded as the source of AgNP toxicity) to many aquatic organisms, our finding that the effect of DOM and sunlight on AgNP dissolution can regulate AgNP toxicity under these conditions is important. The fact that the release of Ag+ and regeneration of AgNPs could both happen in sunlit DOM-rich water implies that previous results of toxicity studies gained by focusing on the original nature of AgNPs should be reconsidered and highlights the necessity to monitor the fate and toxicity of AgNPs under more environmentally relevant conditions.
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Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 10
·3445-3451
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IF 0
Jie-Ning Zheng,Jing-Jing Lv,Shan-Shan Li,Meng-Wei Xue,Ai-Jun Wang,Jiu-Ju Feng
In this study, a simple, facile and one-pot solvothermal method was developed for preparation of reduced graphene oxide (RGO) supported hollow Ag@Pt core–shell nanospheres (hAg@Pt), using ethylene glycol (EG) as a reducing agent and sodium dodecyl sulfate (SDS) as a soft template. Control experiments demonstrated that the molar ratios of the Pt–Ag precursors, the amount of SDS, the presence of RGO, and the reaction temperature were critical to the final nanocomposites. The as-prepared hAg@Pt–RGO showed the improved electrocatalytic activity and durability toward ethylene glycol oxidation, which can serve as a promising potential electrocatalyst in direct alcohol fuel cells.
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Scientific Reports
·
2014
·Vol. 4
·期 1
·1-9
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IF 5.078
Wang Fei,Liu Pei,Sun Lin,Li Cuncheng,Petrenko Valery A.,Liu Aihua
Nanomaterials with near-infrared (NIR) absorption have been widely studied in cancer detection and photothermal therapy (PTT), while it remains a great challenge in targeting tumor efficiently with minimal side effects. Herein we report a novel multifunctional phage-mimetic nanostructure, which was prepared by layer-by-layer self-assembly of Au@Ag heterogenous nanorods (NRs) with rhodamine 6G and specific pVIII fusion proteins. Au@Ag NRs, first being applied for PTT, exhibited excellent stability, cost-effectivity, biocompatibility and tunable NIR absorption. The fusion proteins were isolated from phage DDAGNRQP specifically selected from f8/8 landscape phage library against colorectal cancer cells in a high-throughput way. Considering the definite charge distribution and low molecular weight, phage fusion proteins were assembled on the negatively charged NR core by electrostatic interactions, exposing the N-terminus fused with DDAGNRQP peptide on the surface. The fluorescent images showed that assembled phage fusion proteins can direct the nanostructure into cancer cells. The nanostructure was more efficient than gold nanorods and silver nanotriangle-based photothermal agents and was capable of specifically ablating SW620 cells after 10 min illumination with an 808 nm laser in the light intensity of 4 W/cm 2 . The prepared nanostructure would become an ideal reagent for simutaneously targeted optical imaging and PTT of tumor.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiyuan Chen,Wenhui Chen,Peipei Han,Jizhou Yang,Zhi Wan,Peng Hu,Feng Teng,Haibo Fan
Compared with traditional photocatalytic materials, hollow nanofibers can show greatly improved photocatalytic efficiency due to their large specific surface area and more surface-active sites. In this work, one-dimensional (1D) hollow ZnGa2O4/ZnO nanofibers were successfully prepared by coaxial electrospinning technology first, and then the effect of Ag photodeposition on the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) was studied. It is found that Ag can improve the light absorption of the Ag@ZnGa2O4/ZnO architecture, and meanwhile an S-scheme heterojunction forms between ZnGa2O4 and ZnO, which can synergistically increase the amounts and reduce the recombination of photogenerated carriers, thereby improving the photocatalytic degradation performance. By optimizing the ratio of different mass fractions of Ag, the maximum degradation rate can reach 0.0708 min−1, which is 22 times that of the TC-HCl self-degradation rate. This work not only provides a new idea for the preparation of a 1D hollow nanofiber heterojunction photocatalyst, but has also prepared an effective catalyst for photocatalytic degradation of TC-HCl.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2024
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IF 3.6
Yu Jiang,Zhou Wan,Qi Liu,Xinxin Li,Bo Jiang,Mudan Guo,Pengjue Fan,Siyi Du,Doudou Xu,Chen Liu
Titanium (Ti) implants are widely used in orthopedic and dental applications due to their excellent biocompatibility and mechanical properties. However, bacterial adhesion and subsequent biofilm formation on implant surfaces pose a significant risk of postoperative infections and complications. Conventional surface modifications often lack long-lasting antibacterial efficacy, necessitating the development of novel coatings with enhanced antimicrobial properties. This study aims to develop a novel Ag-TiO2-OTS (Silver-Titanium dioxide-Octadecyltrichlorosilane, ATO) nanocomposite coating, through a chemical plating method. By employing a ‘resist-killing-disintegrate’ approach, the coating is designed to inhibit bacterial adhesion effectively, and facilitate pollutant removal with lasting effects. Characterization of the coatings was performed using spectroscopy, electron microscopy, and contact angle analysis. Antibacterial efficacy, quantitatively evaluated against E. coli and S. aureus over 168 h, showed a significant reduction in bacterial adhesion by 76.6% and 66.5% respectively, and bacterial removal rates were up to 83.8% and 73.3% in comparison to uncoated Ti-base material. Additionally, antibacterial assays indicated that the ratio of the Lifshitz-van der Waals apolar component to electron donor surface energy components significantly influences bacterial adhesion and removal, underscoring a tunable parameter for optimizing antibacterial surfaces. Biocompatibility assessments with the L929 cell line revealed that the ATO coatings exhibited excellent biocompatibility, with minimal cytotoxicity and no significant impact on cell proliferation or apoptosis. The ATO coatings provided a multi-functionality surface that not only resists bacterial colonization but also possesses self-cleaning capabilities, thereby marking a substantial advancement in the development of antibacterial coatings for medical implants.
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APPLIED CATALYSIS A-GENERAL
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2024
·
IF 4.7
Zhi Cao,Yin Wang,Chao Liu,Haitao Cao,Zhongfei Han,Tao Shen,Gang Qi
A series of porphyrin-based porous organic polymer-supported Ag nanoparticle, Ag(0)@POP -x were prepared by the reaction pathway of ion coordination followed by hydrogen reduction. The resulting composite Ag(0)@POP -6.52 shows excellent catalytic performance toward the selective oxidation of HMF to HMFCA, and an impressive HMFCA yield of 97.2% (Na 2 CO 3 2 eq, O 2 2.0 MPa 90 min, 100 °C). Analysis techniques such as ICP-OES, XRD, TEM, SEM, N 2 adsorption-desorption, and XPS was employed to characterize the structure and properties of Ag(0)@POP -6.52 . The reaction conditions including the type of base and solvent, base and catalyst dosage, oxygen pressure, reaction temperature and time were studied in detail to improve the yield of HMFCA. Furthermore, the catalytic stability of the Ag(0)@POP -6.52 was evaluated by leaching and reusing tests, the results shows that the catalyst has good stability and robustness structure. Finally, the other aldehydes oxidation over Ag(0)@POP -6.52 was tested for investigation the substrate scope of Ag(0)@POP -6.52 .
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yaran Song,Meili Jian,Lili Qiao,Ziyi Zhao,Yujia Yang,Tifeng Jiao,Qingrui Zhang
This study addresses the long-standing challenges of removing and recovering trace silver (Ag) ions from wastewater while promoting their sustainable catalysis utilization. We innovatively developed a composite material by combining charged sulfonated polystyrene (PS) with a PDA coating. This composite serves a dual purpose: effectively removing and recovering trace Ag+ from wastewater and enabling reused Ag for sustainable applications, particularly in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The PS–PDA demonstrated exceptional selectivity to trace Ag+ recycling, which is equal to 14 times greater than the commercial ion exchanger. We emphasize the distinct roles of different charged functional groups in Ag+ removal and catalytic reduction performance. The negatively charged SO3H groups exhibited the remarkable ability to rapidly enrich trace Ag ions from wastewater, with a capacity 2–3 times higher than that of positively-N+(CH3)3Cl and netural-CH2Cl-modified composites; this resulted in an impressive 96% conversion of 4-NP to 4-AP within just 25 min. The fixed-bed application further confirmed the effective treatment capacity of approximately 4400 L of water per kilogram of adsorbent, while maintaining an extremely low effluent Ag+ concentration of less than 0.1 mg/L. XPS investigations provided valuable insights into the conversion of Ag+ ions into metallic Ag through the enticement of negatively charged SO3H groups and the in situ reduction facilitated by PDA. This breakthrough not only facilitates the efficient extraction of Ag from wastewater but also paves the way for its environmentally responsible utilization in catalytic reactions.
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