ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 5
·5094-5110
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IF 2.914
Zhang Mengjiao,Zhu Liyun,He Changhua,Xu Xiaojun,Duan Zhengyang,Liu Shuli,Song Mingyao,Song Shumin,Shi Jiemei,Li Yu’e,Cao Guangzhu
In this study, the novel adsorbent PVA-TA-βCD was synthesized via thermal cross-linking between polyvinyl alcohol and β-cyclodextrin. The characterization methods SEM-EDS, FTIR, and XPS were adopted to characterize the adsorbent. The effect of pH, contact time, initial concentrations, and temperature during the adsorption of Pb(II), Cd(II), and Mn(II) onto the PVA-TA-βCD was also investigated. In a single-component system, the data fitted well to pseudo-second-order, and film diffusion and intra-particle diffusion both played important roles in the adsorption process. As for isotherm study, it showed a heterogeneous adsorption capacity of 199.11, 116.52, and 90.28 mg g −1 for the Pb(II), Cd(II), and Mn(II), respectively. Competition between the ions existed in a multi-component system; however, owing to the stronger affinity of the PVA-TA-βCD for Pb(II) relative to Cd(II) and Mn(II), the Pb(II) adsorption onto the PVA-TA-βCD was less affected by the addition of the other metals, which could be effectively explained by the hard and soft acid and base theory (HSAB). Furthermore, PVA-TA-βCD showed good reusability throughout regeneration experiments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Minmin Liu,Chao Cai,Jian Li,Jing Zhao,Wei Teng,Rui Liu
We report a facile Stöber approach to prepare polyphenol-based resin polymer spheres using tannic acid and formaldehyde as reactants. The tannic acid-formaldehyde (TAF) spheres directly convert into carbon spheres with monodispersity and structural integrity. In addition, TAF-Fe complex spheres are carbonized into Fe nanoparticles (NPs) decorated carbon spheres (TAF-C@Fe), which are successfully applied as electrocatalysts for oxygen reduction reaction (ORR) in alkaline media. The electrocatalyst exhibits similar catalytic activity but better methanol tolerance performance to 20% commercial Pt/C in alkaline media. This feasible strategy presents a novel precursor for fabricating and tailoring the structure, composition , and size of polyphenol resin and derived carbon-based materials for energy conversion and storage .
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ULTRASONICS SONOCHEMISTRY
·
2018
·
IF 6.012
Nan Chang,Dui Qin,Pengying Wu,Shanshan Xu,Supin Wang,Mingxi Wan
Inertial cavitation is crucial for the therapeutic effects of sonodynamic. Therefore, approaches that can induce highly efficient inertial cavitation should be of benefit for sonodynamic effect. Our previous study demonstrated that highly efficient inertial cavitation activity can be achieved through the combinatorial use of a short-pulsed focused ultrasound (SPFU) sequence and perfluorohexane (PFH) nanodroplets. Herein, we applied the SPFU sequence and PFH nanodroplets in sonodynamic. A hydrophobic sonosensitizer, IR780 iodine, was loaded inside denatured bovine serum albumin-shelled PFH (PFH@BSA-IR780) nanodroplets. The sonodynamic efficacy was validated by treating HeLa cervical cancer cells. Under SPFU exposure, PFH@BSA-IR780 nanodroplets were highly effective in promoting reactive oxygen species generation and inducing cancer cell death. A significant decrease in cell viability was achieved within just 10 s. Besides the cytotoxicity of ROS, the mechanical bioeffects of inertial cavitation also led to severe cell death resulting from higher acoustic power or the longer treatment time. The application of the SPFU sequence coupled with PFH@BSA-IR780 nanodroplets is a promising strategy for efficient sonodynamic.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20603-20606
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IF 2.324
Hao Yueyue,Zhang Nan,Luo Jing,Liu Xiaoya
Water-dispersible copper nanoparticles (Cu NPs) with good antioxidation properties are facilely synthesized in aqueous solution without inert gas protection employing tannic acid (TA) as the stabilizer and protectant. The sizes of as-prepared tannic acid capped copper nanoparticles (TA-Cu NPs) are in the range of 20–40 nm with a narrow size distribution. Owing to the protection of TA layer, TA-Cu NPs exhibit excellent anti-oxidation power and no oxidation was observed even after being stored under ambient conditions for 90 days. In addition, homogenous Cu NPs inks could be synthesized via the simple dispersion of TA-Cu NPs in water, which can be inkjet-printed onto flexible substrates into conductive patterns using a common color printer.
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Journal of Advanced Ceramics
·
2018
·Vol. 7
·期 3
·246-255
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IF 1.605
Zhang Dandan,Li Jing,Su Zhen,Hu Sanyuan,Li Heping,Yan Youwei
To promote the energy density of symmetric all-solid-state supercapacitors (SCs), efforts have been dedicated to searching for high-performance electrode materials recently. In this paper, vanadium nitride (VN) nanofibers with mesoporous structure have been fabricated by a facile electrospinning method. Their crystal structures and morphology features were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The mesoporous structure of VN nanofibers, which can provide short electrolyte diffusion routes and conducting electron transport pathways, is beneficial to their performance as a supercapacitor electrode. Under a stable electrochemical window of 1.0 V, VN nanofibers possess an excellent mass specific capacitance of 110.8 F/g at a scan rate of 5 mV/s. Moreover, the VN nanofibers were further assembled into symmetric all-solid-state SCs, achieving a high energy density of 0.89 mW·h/cm 3 and a high power density of 0.016 W/cm 3 over an operating potential range from 0 to 1.0 V. These results demonstrate that VN nanofibers could be potentially used for energy storage devices.
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Food & Function
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2018
·Vol. 9
·期 11
·5547-5559
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IF 3.289
Peng Yang,Guo-Bin Ding,Wen Liu,Rong Fu,Amin Sajid,Zhuoyu Li
Tannic acid (TA), a naturally occurring polyphenolic acid that is primarily found in grapes and green tea, exhibits potent antioxidant and anticarcinogenic characteristics. However, the underlying molecular mechanisms and targets of TA, which are responsible for cancer prevention, remain elusive. In the present study, we used TA-functionalized magnetite nanoparticles to identify pyruvate kinase isoenzyme M2 (PKM2) as the direct target of TA. We report that TA selectively inhibits the pyruvate kinase activity of PKM2, rather than protein kinase activity and PKM2 expression, to suppress colorectal cancer (CRC) cell proliferation. Furthermore, we had discovered that lysine residue 433 (K433) is a selective druggable site. Through direct binding to lysine residue 433, TA triggers the dissociation of PKM2 tetramers and further blocks the metabolic activity of PKM2. Notably, TA has no effect on PKM1 activity as TA does not bind to it. Taken together, these findings show that TA is worthy of consideration as a promising PKM2 inhibitor for the prevention of CRC.
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ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Long Meng,Kai Pan,Ye Zhu,Wei Wei,Xiaojie Li,Xiaoya Liu
Herein, a hydrophobized zwitterionic-based copolymer poly(sulfobetaine methacrylate-co-2-(dimethylamino)ethyl methacrylate-co-isobornyl acrylate) (P(SBMA-co-DMA-co-ISA), PSDI) containing a chiral structure has been successfully synthesized by free radical polymerization and subsequent sulfonation reactions. Together with tannic acid (TA), PSDI colloidal particles (CPs) were anchored onto the Ti alloy surface by the electrophoretic deposition method. The composition, morphology, and surface properties of the CP-TA composite coatings were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), optical contact angle (OCA), and other methods. The results show that the introduction of TA improves the stability of coatings by participating in the noncovalent interactions including ionic pairing and hydrogen bonding. According to the in vitro bacterial adhesion test, the modified titanium surface containing SBMA and chiral ISA functional units can effectively inhibit Gram-negative bacteria (E. coli) and Gram-positive bacteria (S. aureus) adhesion. Furthermore, the excellent cytocompatibility and favorable cell adhesion and growth behavior of zwitterionic-based coatings were realized as a result of the appropriate hydrophobicity provided by the ISA moiety. This work provides a new strategy for preparing zwitterionic-based multifunctional coating. The coating with excellent bacterial and cell selective adhesion properties has great potential in the applications of metal implant materials, such as cardiovascular stents and human hard tissue repair and replacement materials.
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Protection of Metals and Physical Chemistry of Surfaces
·
2018
·Vol. 54
·期 5
·917-925
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IF 0.681
Guo Lei,Wu Min,Leng Senlin,Qiang Yujie,Zheng Xingwen
The mutually corroborated electrochemical measurements and theoretical calculations were used to investigate the corrosion inhibition performances of purpald (4-amino-3-hydrazino-5-mercapto-1,2,4-triazole, AHMT) and its synergistic effect with tartaric acid (TA) on mild steel in 0.5 M H 2 SO 4 solution. The experimental results show that the inhibition efficiency increases with the concentration of AHMT and increases further when TA exists. Density functional theory (DFT) calculations were performed to interpret the measured data and trends observed in the electrochemical studies. Furthermore, molecular dynamic simulation revealed a nearly flat configuration for molecules on metal surface with negative adsorption energies in a sequence agreed with experimental observation.
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RSC Advances
·
2015
·Vol. 5
·期 105
·86445-86452
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IF 3.84
Zhenzhen Zhang,Lingling Wang,Xueyan Liu,Danfeng Zhang,Lei Zhang,Qi Li
A new micro-solid-phase extraction method based on a prestructured filter membrane was developed to facilitate simultaneous analysis of tartrazine (TA) and sunset yellow (SY) with high performance liquid chromatography (HPLC). A filter membrane impregnated with nano-Al2O3 particles was proposed as a new micro-solid-phase extraction (μ-SPE) device for the preconcentration of colorants in food. The method integrated isolation and concentration in one step, and the adsorbed colorants could be easily eluted from the filter membrane for HPLC analysis. This process does not involve any additional sample treatment. The method is facile and easy to operate. The method showed good linearity, with correlation coefficients >0.9982 in the range of 1.0–200.0 ng mL−1, and low limits of detection (0.10–0.20 ng mL−1). Finally, the recovery values were 86.9–124.0% for the colorants in various food samples. The results indicated that the developed method would be a novel method for rapid determination of TA and SY at trace levels in real samples.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 1
·
IF 1.768
BeiXing Li,Lei Guan,Kai Wang,DaXia Zhang,WeiChang Wang,Feng Liu
A model chlorpyrifos microcapsule was prepared using coordination assembly between Fe 3+ and tannic acid (TA). The influence of independent variables such as the dropping rate of TA ( X 1 ) and Fe 3+ ( X 3 ), the concentration of TA ( X 2 ) and Fe 3+ ( X 4 ), and the reaction temperature ( X 5 ) on the encapsulation efficiency ( R 1 ) and release characteristics ( R 2 ) of the microcapsule had been investigated, based on a central composite design with five factors and five levels. The results showed that the main factors influencing R 1 and R 2 were X 4 and X 2 , then the interaction between X 2 and X 4 , followed by X 5 and X 3 . The optimal formula mainly based on higher R 1 and lower R 2 were determined and then tested. The optimized conditions led to an encapsulation efficiency and cumulative release proportion of 97.12% ± 0.72% and 40.07% ± 0.53%, along with the average relative errors of predicted values being 1.78% and −1.60%, respectively. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42865.
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Polymers
·
2016
·Vol. 8
·期 9
·314
·
IF 2.944
Xiaoma Fei,Fangqiao Zhao,Wei Wei,Jing Luo,Mingqing Chen,Xiaoya Liu
Toughening an epoxy resin by bio-based modifiers without trade-offs in its modulus, mechanical strength, and other properties is still a big challenge. This paper presents an approach to modify epoxy resin with tannic acid (TA) as a bio-based feedstock. Carboxylic acid-modified tannic acid (TA–COOH) was first prepared through a simple esterification between TA and methylhexahydrophthalic anhydride, and then used as a modifier for the epoxy/anhydride curing system. Owing to the chemical modification, TA–COOH could easily disperse in epoxy resin and showed adequate interface interaction between TA–COOH and epoxy matrix, in avoid of phase separation. The use of TA–COOH in different proportions as modifier of epoxy/anhydride thermosets was studied. The results showed that TA–COOH could significantly improve the toughness with a great increase in impact strength under a low loading amount. Moreover, the addition of TA–COOH also simultaneously improved the tensile strength, elongation at break and glass transition temperature. The toughening and reinforcing mechanism was studied by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA) and thermal mechanical analysis (TMA), which should be owned to the synergistic effect of good interface interaction, aromatic structure, decreasing of cross linking density and increasing of free volume. This approach allows us to utilize the renewable tannic acid as an effective modifier for epoxy resin with good mechanical and thermal properties.Keywords:tannic acid;epoxy resin;bio-based;toughening
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Ziqiang Xu,Xiuhua Wang,Xiangmei Liu,Zhenduo Cui,Xianjin Yang,Kelvin Wai Kwok Yeung,Jonathan Chiyuen Chung,Paul K. Chu,Shuilin Wu
Silver nanoparticles (AgNPs) enwrapped in the biologically safe tannic acid (TA)/Fe3+ nanofilm are synthesized by an ultrafast, green, simple, and universal method. The physical antibacterial activity and photodynamic antibacterial therapy (PAT) efficacy of the TA/Fe3+/AgNPs nanofilm were investigated for the first time, which exhibited a strong physical antibacterial activity as well as great biocompatibility, through in vitro and in vivo studies. The results disclosed that this hybrid coating could possess high PAT capabilities upon irradiation under a visible light of 660 nm, which is longer than those of previously reported green and blue sensitization light, thus allowing deeper light penetration into biological tissues. Electron spin resonance (ESR) spectra proved that the PAT efficacy of the TA/Fe3+/AgNPs nanofilm was associated with the yields of singlet oxygen (1O2) under the irradiation of visible light (660 nm). A higher PAT efficiency of 100 and 94% against Escherichia coli and Staphylococcus aureus could be achieved within 20 min of illumination under 660 nm visible light, whereas the innate physical antibacterial activity of AgNPs could endow the implants with long-term prevention of bacterial infection. The mechanism of PAT may be associated with the formation of oxidative stress and oxidative damage to key biomolecules (proteins and lipids) in bacteria. Our results reveal that the synergistic action of both PAT and physical action of AgNPs in this hybrid nanofilm is an effective way to inactivate bacteria, with minimal side effects.
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