FOOD HYDROCOLLOIDS
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2021
·
IF 9.147
Cen Zhang,Peng Wang,Jiawen Li,Hui Zhang,Jochen Weiss
Core-shell nanofibers were electrospun from bilayer gelatin/gum arabic corn oil-in-water emulsions crosslinked by genipin. The crosslinking increased the apparent viscosity and induced a predominantly elastic behavior of the emulsions, which favored the formation of a more stable emulsion system and then electrospun fibers with larger diameters. These fibers had improved surface hydrophobic and mechanical properties, and did not thermally decompose until heated to 250 ° C, which might be associated with the chemical bonds formed between primary amines on the protein chains. The encapsulation efficiency of corn oil in the fibers at different crosslinking time was higher than 86% without any significant change during 7 days of storage at room temperature. Thus, this work provides a genipin crosslinking strategy to the development of emulsion-based fibrous mats with desired mechanical and surface hydrophobic properties for food applications of bioactive encapsulation and controlled release.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Yifan Liu,Yan Luo,Mingliang Li,Lixia Yang
A novel Bi 2 MoO 6 (BMO) modified g-C 3 N 4 heterostructure composite photocatalyst (g-C 3 N 4 /BMO) was prepared by hydrothermal method . The orthorhombic crystal phase of the material was studied by the X-ray diffraction assay (XRD). The microscopic morphology of the material was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), indicating a heterojunction structure of the composite. The electrons and holes separation was evaluated by photo-luminescence (PL) and photocurrent measurements. The removal rate of O-Nitrophenol was as high as 97.3% over the catalyst with the optimal ratio of 1: 0.09 (BMO:g-C 3 N 4 ) in 180 min. COD removal percentage of actual pharmaceutical wastewater was as high as 71.40%. The active species in the photocatalytic system were studied, indicating superoxide radicals ( · O 2 - ) and holes (h + ) as the main active species.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Gaobo Lou,Gu Pei,Yitian Wu,Yingzhuo Lu,Yatao Wu,Xinqiang Zhu,Yajun Pang,Zhehong Shen,Qiang Wu,Shenyuan Fu,Hao Chen
Low-cost, high-performance, and long-life cathode materials are highly desired for zinc ion hybrid supercapacitors (ZHSs). Here, an N, O co-doped two-dimensional (2D) carbon nanosheet material is successfully fabricated via a one-step combustion conversion of wood for the excellent usage as the cathode material in zinc-ion hybrid supercapacitors. This novel combustion conversion synthesis with Zn(NO 3 ) 2 ·6H 2 O as oxidizer and urea as fuel can easily achieve the carbonization, pore-forming, and heteroatom doping within a one-step process. More interestingly, the resulting N, O co-doped porous carbon owns relatively uniform 2D sheet structure and very high specific surface area (1248 m 2 g −1 ), which can not only provide short electric/ionic transfer path plus optimized wettability and conductivity for high power output, but also offer abundant interfacial active sites as well as improved ion adsorption capacity for high energy storage. Benefiting from these advantages, the ZHS based on this N, O co-doped 2D carbon nanosheets exhibits a superior specific capacity of 111.0 mAh g −1 at 0.1 A g −1 , high rate capability of 57.6% capacity retention at a 30-fold higher current, and attractive energy density of 109.5 Wh kg −1 at 225 W kg −1 . More gratifyingly, it displays ultralong cycling life with 92.7% capacity reservation after 50,000 charge and discharge cycles. Moreover, a quasi-solid ZHS with N, O co-doped 2D carbon nanosheets coated on the carbon cloth as the cathode also displays satisfactory specific capacity (34.6 mAh g −1 ), impressive energy density (27.7 Wh kg −1 ), and nice flexibility.
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MACROMOLECULES
·
2020
·
IF 5.918
Fan Zhang,Tiantian Li,Wanting Chen,Xiaoming Yan,Xuemei Wu,Xiaobin Jiang,Yang Zhang,Xiaozhou Wang,Gaohong He
As critical triggers, both the electron-withdrawing links and neighboring cationic groups induce and accelerate the aryl ether cleavage in the widely used aryl ether containing anion exchange membranes (AEMs). Herein, a novel alkaline stable polyelectrolyte is proposed by converting the electron-withdrawing C═O links in the widely used poly(aryl ether ketone) backbone into the electron-donating C–NH2 links, and then grafting faraway para-type cations by Leuckart-Menshutkin reaction without using noble metal catalysts. Contributions of the elimination of electron-withdrawing C═O links and graft of para-type cations to the excellent alkaline stability of the aryl ether containing polyelectrolytes are demonstrated through density functional theory, as the increasing electron cloud density on the ether-connected carbon atom elevates the activation energy barrier to OH– initiated aryl ether cleavage, and the para-type cation is more stable than the conventional ortho-type cation due to the sterical protection and low electrophilicity to benzylic carbon. By converting C═O to C–NH2 groups and then tuning the quaternization degree, the remaining C–NH2 groups in the polymer backbone could form hydrogen bonding networks to reinforce the membranes. The novel quaternized poly(aryl ether amine) membrane exhibits high conductivity (92.2 mS cm–1 at 80 °C), excellent mechanical properties (48.2 MPa, 51.3%), and suppressed swelling ratio (12.8% at 80 °C). Excellent alkaline stability is also confirmed experimentally with no polymer backbone degradation even in harsh conditions (4 M KOH, 80 °C, 400 h), which is at the top level among the state-of-the-art side chain and aryl ether-free types of AEMs.
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CHEMOSPHERE
·
2020
·
IF 5.778
Juping You,Yingying Deng,Han Chen,Jiexu Ye,Shihan Zhang,Jingkai Zhao
An exoelectrogens, Shewanella oneidensis MR-1 ( S. oneidensis MR-1), was supplied to a microbial fuel cell (MFC) to enhance the degradation of a recalcitrant organic compound, o -xylene. The experimental results revealed that, with the addition of the S. oneidensis MR-1, the o -xylene removal efficiency increased by 35–76% compared with the original MFC. The presence of the S. oneidensis MR-1 not only improved the activity of the biofilm in the bioanode but also developed the connections between the bacteria by nanowires . Therefore, the maximum power density increased from 52.1 to 92.5 mW/m 3 after the addition of the S. oneidensis MR-1. The microbial community analysis showed that adding the S. oneidensis MR-1 increased the biodiversity in bioanode. The dominant exoelectrogens shifted from Zoogloea sp., Delftia sp., Achromobacter sp., Acinetobacter sp., Chryseobacterium sp., and Stenotrophomonas sp. to Zoogloea sp., Delftia sp., Shewanella sp., Achromobacter sp., Hydrogenophaga sp., Sedimentibacter sp. and Chryseobacterium sp.. Furthermore, the cyclic voltammetry analysis showed that the outer membrane bound protein complex of OmcA–MtrCAB was involved as direct electron transfer pathway in the S. oneidensis MR-1 containing bioanode. We believed that this work is promising to provide optional strategy for efficient VOCs degradation by adjusting the microbial community in the bioanode.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
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IF 3.99
Han Jia,Hongyan Wu,Xin Wei,Yugui Han,Qiuxia Wang,Jinyong Song,Jiajun Dai,Hui Yan,Dexin Liu
Emulisons stabilized by surfactants have been used in enhanced oil recovery (EOR) for effective profile control and displacement, whereas the lack of long-term stability especially under harsh reservoir conditions limited their wide application. In this study, Pickering emulsions stabilized by sodium dodecylbenzenesulfonate (SDBS) and anisotropic slice-like AlOOH nanoparticles were systematically studied. The adsorption of SDBS on AlOOH nanoparticles was confirmed by the measurements of zeta potential and Fourier Transform Infrared (FTIR) spectra. The three-phase contact angle tests were conducted to explore the reason for the double phase inversion of the AlOOH/SDBS stabilized emulsions from o/w to w/o and back to o/w again. The optical microscopy images verified the adsorption mechanism of SDBS on AlOOH nanoparticles at the oil/water interface. It was found that the three-dimensional network structure formed by the micro-flocculated modified AlOOH nanoparticles could prevent coalescence and phase separation, resulting in the enhanced stability of the emulsion. The AlOOH/SDBS stabilized emulsion showed the super tolerances in a wide range of shear rates, temperature and electrolyte concentrations. The core flooding tests and microscopic visualization flooding experiments demonstrated that the AlOOH/SDBS stabilized emulsions significantly improved the tertiary oil recovery (33 % of IOIP) via the enhanced displacement and sweep efficiencies. The present study provides a typical Pickering emulsion with great stability under harsh reservoir conditions for EOR.
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JOURNAL OF MEDICINAL FOOD
·
2020
·Vol. 23
·期 1
·90-99
·
IF 2.04
Yuanruo Gan,Yong Fu,Lipin Yang,Jiangning Chen,Hong Lei,Qin Liu
Anthocyanin-rich extracts have shown anti-inflammation activity in mouse colitis models. Cyanidin-3-glucoside (C3G) is one of the widespread anthocyanins in plants, and cyanidin (Cy) is the aglycone of C3G that can be generated in intestine under gut microorganism metabolism. To explore the anti-inflammatory activity of single anthocyanins compound and show the potential mechanism, the protective effects of C3G and its aglycone Cy on 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced colitis in mice and lipopolysaccharide (LPS)-stimulated Caco-2 cellular monolayer inflammation were studied. The results showed that both C3G and Cy significantly improved the clinical symptoms and relieved the histological damage in TNBS-challenged mice. The activity of myeloperoxidase and the excretion of inflammatory cytokines tumor necrosis factor-α, interleukin-1β, interleukin-6, and interferon-γ were also significantly inhibited at the administration dosage of 200 μmol/kg. In vitro studies showed that when LPS-stimulated Caco-2 cells were pretreated with C3G and Cy, the destruction of the intestinal epithelial barrier was ameliorated due to the improvement of the transepithelial electrical resistance and Lucifer yellow flux values, while there were no significant difference between C3G and Cy groups at the same dosage. Similarly, both C3G and Cy suppressed nitric oxide production and inflammatory cytokines secretion of LPS-induced Caco-2 cells. C3G and its aglycone Cy had similar anti-inflammatory activity in both colitis mice and Caco-2 cells. The results suggest that C3G and Cy may exert anti-inflammatory effects by protecting the intestinal barrier as well as by suppressing inflammatory cytokine secretion. Thus, C3G or Cy could be potential preventive agents or supplementary medicines for inflammatory bowel disease.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·16648-16657
·
IF 3.591
Jing-Jiang Liu,Zhi-Wei Yan,Rui-Xue Kang,Jin-Hui Wang,Xun Feng
Herein, unique N,O-codoped porous biocarbon (PB) was prepared using Ephedra Herb (EH) as a precursor via a green and sustainable NaCl-sealing strategy and subsequent pyrolysis method. PB possesses vast microstructure, interlinked pores, and high specific surface area, which can facilitate ion adsorption and buffering to improve its properties as an electrode material. In addition, the high specific surface area, well-developed porosity, and abundant heteroatoms in EH are retained well owing to the salt-sealing approach, contributing to additional pseudocapacitance. Therefore, a typical PB sample (S12), obtained from the NaCl-sealing and pyrolysis of the mixture of EH and NaCl at a mass ratio of 1 : 2, is endowed with high specific capacitance, excellent rate performance, and performance retention over long-term cycling. Most importantly, an aqueous symmetrical supercapacitor (S12//S12) assembled with S12 electrodes has a superior specific energy density of 11.6 W h kg−1 at a specific power density of 450.1 W kg−1 in Li2SO4 electrolyte. This work confirms the utility of a NaCl-sealing strategy for designing high specific surface area biocarbon materials that are ultra-rich in micropores, and it sheds some light on the use of sustainable and low-cost synthetic carbon that is ultra-rich in micropores to meet energy-storage device requirements.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 31
·期 11
·4177-4187
·
IF 3.543
Yang Wenming,Wu Changchun,Wang Ningwei,Song Guangsan,Ni Xiaoni,Huang Weihong
A fluorescent probe based on the functionalized carbon quantum dots (CQDs-OPD) was successfully synthesized for selective and sensitive detection of Cu 2+ . Using O-phenylenediamine (OPD) as the carbon resource and N,N-dimethylformamide (DMF) as the solvent, the CQDs-OPD was prepared by the hydrothermal method. The fluorescence mechanism of CQDs-OPD was studied by the intercept method. Furthermore, the probe was characterized by TEM, UV–Vis, FT-IR and Zeta potentiometric analysis, the fluorescent probe exhibits a good fluorescence properties and stability. The prepared ratio-fluorescent probe shows a good linear range from 0 to 25 μmol/L with a lower LOD of 40 nmol/L. Moreover, the probe also has been successfully applied to the detection of Cu 2+ in the real samples with the recovery rate of 96.92–97.80% and the RSD of less than 2.0%.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Pei Zhu,Yan Wang,Minghang Zhang,Yingdong Wu,Wangfeng Cai
In order to investigate the influence of the anions on the electrochemical performance of cobalt-based compounds, Co 3 O 4 and Co 3 Se 4 are studied and theoretically analyzed with the density functional theory (DFT). Avoiding of the traditional synthesis of the high-temperature annealing for the transition metal oxides, the cubic spinel phase Co 3 O 4 on a nickel foam (NF) substrate with a simple two-step hydrothermal method and Co 3 Se 4 with the core-branched structure by anions exchange method are prepared. The electrochemical measurements show that the capacitance and conductivity of Co 3 Se 4 are significantly better than those of Co 3 O 4 , and Co 3 Se 4 still maintain high capacity at high current density. Furthermore, the kinetics of electrode material Co 3 O 4 and Co 3 Se 4 are analyzed and compared. According to the calculation of the density of states, the results show the band gap of Co 3 O 4 is 2.18 eV and the Fermi energy line of Co 3 Se 4 enters into the conduction band, which means the conductivity of Co 3 Se 4 is better than that of Co 3 O 4 . Additionally, three redox reactions during the charge and discharge process of Co 3 O 4 are determined and the band gaps changes are also calculated.
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RSC Advances
·
2021
·Vol. 11
·期 49
·30971-30979
·
IF 3.361
Huadong Zhang,Zhongyi Yan,Zhizhou Yang,Jinshui Yao,Qiuhong Mu,Dan Peng,Hui Zhao
A novel silicone resin (SR-OH) containing phenolic hydroxyl (Ph–OH) groups was designed and synthesized via co-hydrolysis/condensation and catalytic hydrogenation. During the curing process, the cross-linking degree of the resin was further increased by the Si–O–Ph bonds formed by the reaction of the Ph–OH and terminal Si–OH groups. Thermogravimetric analysis (TGA) showed that the cured resin product exhibited excellent thermal and thermo-oxidative stability, which was much higher than that of a typical methyl phenyl silicone resin (SR-Ph). The temperature at which 5% weight loss occurs (Td5) was up to 606 °C (nitrogen) and 542 °C (air), and its char yield at 800 °C was 91.1% and 85.3% in nitrogen and air, respectively. The significant improvement in thermal stability was mainly attributed to the formation of Si–O–Ph bonds which not only increases the cross-linking degree of the resin but also significantly prevents degradation by the ‘back-biting’ and oxidative cleavage.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Kui Wu,Yajun Li
The solid–liquid equilibrium data of o-toluenesulfonamide in 16 pure organic solvents, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, acetone, ethyl acetate, acetonitrile, cyclohexanone, cyclopentanone, methyl acetate, ethyl formate, and dichloromethane, were measured by a static gravimetric method with the temperature ranging from 273.15 to 323.85 K under atmospheric pressure. The results showed that the solubility of o-toluenesulfonamide increased with the increasing temperature in all the solvents studied. The experimental solubility data were correlated by the modified Apelblat equation, λh equation, nonrandom two-liquid (NRTL) equation, and Wilson equation. All the models could be well employed, and the NRTL model gave the best fitting results.
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危险品化学品经营许可证（带存储）