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  1. Article ; Online: Fabrication of supported acid catalytic composite fibers by a simple and low-cost method and their application on the synthesis of liquid biofuel 5-ethoxymethylfurfural

    Yinhua Yan / Huiqin Guo / Kexin Li / Liushui Yan

    Green Energy & Environment, Vol 7, Iss 1, Pp 165-

    2022  Volume 171

    Abstract: In this paper, sulfonic groups functionalized annealed bio-based carbon microspheres loaded polytetrafluoroethylene (A-BCMSs-SO3H@PTFE) fibers with high activity, high stability, and easy regeneration were successfully fabricated by a simple method using ...

    Abstract In this paper, sulfonic groups functionalized annealed bio-based carbon microspheres loaded polytetrafluoroethylene (A-BCMSs-SO3H@PTFE) fibers with high activity, high stability, and easy regeneration were successfully fabricated by a simple method using low-cost raw materials. The characterization results showed that the annealed biomass carbon microspheres derived from waste Camellia oleifera shells were evenly distributed on the polytetrafluoroethylene fibers and the sulfonic groups can be successfully loaded on the surface of annealed biomass carbon microspheres by room temperature sulfonation. Subsequently, the as-prepared A-BCMSs-SO3H@PTFE fibers were applied to the acid-catalyzed synthesis of liquid biofuel 5-ethoxymethylfurfural. The catalytic experiment results indicated that the annealing temperature and time during catalyst preparation have a significant effect on the activity and selectivity of A-BCMSs-SO3H@PTFE fibers. The results of catalytic reaction kinetics showed that the yield of 5-ethoxymethylfurfural can reach more than 60% after 72 h of acid-catalyzed reaction. The stability test showed that the as-prepared A-BCMSs-SO3H@PTFE fibers still maintained a stable acid catalytic activity after four recycles.
    Keywords Acid catalysis ; Waste Camellia oleifera shells ; Sulfonic groups ; Polytetrafluoroethylene fibers ; 5-Ethoxymethylfurfural ; Renewable energy sources ; TJ807-830 ; Ecology ; QH540-549.5
    Subject code 660
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher KeAi Communications Co., Ltd.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Fabrication of biobased heterogeneous solid Brønsted acid catalysts and their application on the synthesis of liquid biofuel 5-ethoxymethylfurfural from fructose

    Yingying Wen / Zhou Yu / Kexin Li / Huiqin Guo / Yuhua Dai / Liushui Yan

    Green Energy & Environment, Vol 3, Iss 4, Pp 384-

    2018  Volume 391

    Abstract: A series of biobased heterogeneous solid Brønsted acid catalysts with perfect spherical microstructures are successfully fabricated directly from waste Camellia oleifera shells by a simple hydrothermal carbonization-annealing-sulfonation process. 350 °C ... ...

    Abstract A series of biobased heterogeneous solid Brønsted acid catalysts with perfect spherical microstructures are successfully fabricated directly from waste Camellia oleifera shells by a simple hydrothermal carbonization-annealing-sulfonation process. 350 °C low temperature annealing process helps to increase the activity of the catalyst due to the simultaneous maintenance of the spherical microstructure and aromatic carbon framework. As a renewable catalyst with low cost, the as-prepared materials are successfully applied on the synthesis of green renewable liquid biofuel 5-ethoxymethylfurfural (EMF) directly from fructose. In the catalytic test, the influences of reaction time and temperature, fructose concentration, and adding amount of the catalyst on the yield of EMF are investigated systematically. As a result, the optimal reaction temperature is 100 °C, the EMF yield monotonically increases with prolonging the reaction time from 3 to 24 h, the optimal fructose concentration is 0.5 mmol, and the EMF yield gradually increases with increasing the adding amount of the catalyst from 50 to 150 mg. In addition, the as-prepared catalysts exhibit considerably high stability in the current EMF synthesis system, and they can maintain a similar level of reactivity after four catalytic cycles. Keywords: Hydrothermal carbonization, Annealing, Sulfonation, 5-Ethoxymethylfurfural, Fructose
    Keywords Renewable energy sources ; TJ807-830 ; Ecology ; QH540-549.5
    Subject code 660
    Language English
    Publishing date 2018-10-01T00:00:00Z
    Publisher KeAi Communications Co., Ltd.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Surface molecular imprinting on carbon microspheres for fast and selective adsorption of perfluorooctane sulfonate

    Guo, Huiqin / Yu Liu / Wentian Ma / Liushui Yan / Kexin Li / Sen Lin

    Journal of hazardous materials. 2018 Apr. 15, v. 348

    2018  

    Abstract: Perfluorooctane sulfonate (PFOS) is a persistent organic pollutant with high biological and chemical stability. It is important to develop fast and selective adsorption method for PFOS wastewater treatment. In this study, novel molecularly imprinted ... ...

    Abstract Perfluorooctane sulfonate (PFOS) is a persistent organic pollutant with high biological and chemical stability. It is important to develop fast and selective adsorption method for PFOS wastewater treatment. In this study, novel molecularly imprinted polymer (MIP) for PFOS adsorption was prepared. To obtain rapid adsorption kinetics, the MIP has been designed as the surface polymer using the carbon microsphere as carrier (MIP-CMSs). To ensure high adsorption selectivity to the template, two monomers with different functional structures, namely methacryloyloxyethyl trimethyl ammonium chloride (DMC) and 2-(trifluoromethyl)acrylic acid (TFMA), were employed as bi-functional monomers. The structure and morphology of MIP-CMSs were characterized using field emission scanning electron microscopy with the energy dispersive spectrometer, transmission electron microscopy, and Fourier transformation infrared spectroscopy. Based on the adsorption experiments, it was concluded that MIP-CMSs had specific binding property for PFOS on acidic condition. The adsorption equilibrium time was 1h, while the adsorption capacity was 75.99 mg g−1 at pH 3. Coexistence with contaminants with different structures had little influence on the selectivity for PFOS. The spent MIP-CMSs could be regenerated by the methanol and acetic acid mixed solution. The electrostatic interaction and molecular size played important roles in recognizing the target compound in the adsorption process.
    Keywords acetic acid ; acrylic acid ; adsorption ; binding properties ; carbon ; electrostatic interactions ; energy-dispersive X-ray analysis ; infrared spectroscopy ; methanol ; microparticles ; molecular imprinting ; molecular weight ; pH ; perfluorooctane sulfonic acid ; polymers ; scanning electron microscopy ; transmission electron microscopy ; wastewater treatment
    Language English
    Dates of publication 2018-0415
    Size p. 29-38.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2018.01.018
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Well-defined magnetic surface imprinted nanoparticles for selective enrichment of 2,4-dichlorophenoxyacetic acid in real samples

    Sheng, Le / Yulong Jin / Yonghuan He / Yanyan Huang / Liushui Yan / Rui Zhao

    Talanta. 2017 Nov. 01, v. 174

    2017  

    Abstract: Superparamagnetic core-shell molecularly imprinted polymer nanoparticles (MIPs) were prepared via surface initiated reversible-addition fragmentation chain transfer (si-RAFT) polymerization for the selective recognition of 2,4-dichlorophenoxyacetic acid ( ...

    Abstract Superparamagnetic core-shell molecularly imprinted polymer nanoparticles (MIPs) were prepared via surface initiated reversible-addition fragmentation chain transfer (si-RAFT) polymerization for the selective recognition of 2,4-dichlorophenoxyacetic acid (2,4-D) in real samples. The construction of uniform core-shell structure with a 50nm MIP layer was successfully accomplished, which favored mass transfer and resulted in fast recognition kinetics. The static equilibrium experiments revealed the satisfied adsorption capacity and imprinting efficiency of Fe3O4@MIP. Moreover, the Fe3O4@MIP exhibited high selectivity and affinity towards 2,4-D over structural analogues. The prepared Fe3O4@MIP nanoparticles were used for the selective enrichment of 2,4-D in tap water and Chinese cabbage samples. Combined with RP-HPLC, the recoveries of 2,4-D were calculated from 93.1% to 103.3% with RSD of 1.7–5.4% (n = 3) in Chinese cabbage samples. This work provides a versatile approach for fabricating well-constructed core-shell MIP nanoparticles for rapid enrichment and highly selective separation of target molecules in real samples.
    Keywords 2,4-D ; Chinese cabbage ; adsorption ; chemical elements ; mass transfer ; nanoparticles ; polymerization ; polymers ; reversed-phase high performance liquid chromatography ; tap water
    Language English
    Dates of publication 2017-1101
    Size p. 725-732.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2017.07.002
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Synthesis of molecularly imprinted polymers using acrylamide‐β‐cyclodextrin as a cofunctional monomer for the specific capture of tea saponins from the defatted cake extract of Camellia oleifera

    Guo, Huiqin / Jingjing Xiong / Wentian Ma / Minghuo Wu / Liushui Yan / Kexin Li / Yu Liu

    Journal of separation science. 2016 Nov., v. 39, no. 22

    2016  

    Abstract: Molecularly imprinted polymers were synthesized using mixed tea saponins as a template and acrylamide‐β‐cyclodextrin as a cofunctional monomer for the specific binding and purification of tea saponins from the defatted cake extract of Camellia ... ...

    Abstract Molecularly imprinted polymers were synthesized using mixed tea saponins as a template and acrylamide‐β‐cyclodextrin as a cofunctional monomer for the specific binding and purification of tea saponins from the defatted cake extract of Camellia oleifera. The adsorption properties of the prepared polymers were systematically evaluated including adsorption kinetics, adsorption isotherms, and selective recognition characteristics. It showed that the adsorption kinetics followed the pseudo first‐order kinetic model (R² = 0.995) with an equilibrium time of 3 h, adsorption isotherm data fitted well with the Langmuir–Freundlich model (R² = 0.984) with an adsorption capacity of 14.23 mg/g. The relative selectivity coefficient (k´) in the presence of the analogues glycyrrhizic acid and glycyrrhetinic acid were 1.16 and 17.21, respectively. The performance of the molecularly imprinted polymers as solid‐phase extraction materials was investigated and the results indicated that using acrylamide‐β‐cyclodextrin as a cofunctional monomer improved both the adsorption capacity and active sites stability of the imprinted polymers. The solid‐phase extraction using the polymers as packing materials was subsequently applied for the separation of tea saponins in raw C. oleifera press extract, and targets were obtained with a purity reaching 89%.
    Keywords Camellia oleifera ; active sites ; adsorption ; glycyrrhizin ; kinetics ; models ; packaging materials ; polymers ; saponins ; solid phase extraction ; sorption isotherms ; tea
    Language English
    Dates of publication 2016-11
    Size p. 4439-4448.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2047990-6
    ISSN 1615-9314 ; 1615-9306
    ISSN (online) 1615-9314
    ISSN 1615-9306
    DOI 10.1002/jssc.201600834
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  6. Article: Fabrication of mesoporous Fe3O4@SiO2@CTAB–SiO2 magnetic microspheres with a core/shell structure and their efficient adsorption performance for the removal of trace PFOS from water

    Li, Kexin / Huiqin Guo / Jingjing Xiong / Liushui Yan / Shufen Liu / Tong Chen / Yuhua Dai / Zhenxing Zeng

    Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2015 Jan. 20, v. 465

    2015  

    Abstract: Novel mesoporous CTAB-functionalized magnetic microspheres with a core/shell structure (mesoporous Fe3O4@SiO2@CTAB–SiO2) was fabricated via a simple sol–gel method combined with selective etching strategy. The morphology, porosity, magnetic property, ...

    Abstract Novel mesoporous CTAB-functionalized magnetic microspheres with a core/shell structure (mesoporous Fe3O4@SiO2@CTAB–SiO2) was fabricated via a simple sol–gel method combined with selective etching strategy. The morphology, porosity, magnetic property, composition, and structure of mesoporous Fe3O4@SiO2@CTAB–SiO2 were characterized. Subsequently, the as-prepared composites were successfully applied to remove trace PFOS (500ngL−1) from water at acidic conditions (pH=3). The fabrication mechanism of mesoporous Fe3O4@SiO2@CTAB–SiO2 and the impact of various factors on the removal of trace PFOS from water were systematically studied. The recyclability of the as-prepared composites was tested for, five times, at the same conditions.
    Keywords adsorption ; cetyltrimethylammonium bromide ; magnetic properties ; porosity ; porous media ; sol-gel processing
    Language English
    Dates of publication 2015-0120
    Size p. 113-123.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1500517-3
    ISSN 0927-7757
    ISSN 0927-7757
    DOI 10.1016/j.colsurfa.2014.10.044
    Database NAL-Catalogue (AGRICOLA)

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