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    刘叶峰, 吕迎, 李瑞琪, 左鹏, 王蕊欣. 磁性壳聚糖负载多金属氧酸盐及其催化氧化四氢噻吩的性能[J]. 功能高分子学报, 2020, 33(6): 580-588. doi: 10.14133/j.cnki.1008-9357.20200228001
    引用本文: 刘叶峰, 吕迎, 李瑞琪, 左鹏, 王蕊欣. 磁性壳聚糖负载多金属氧酸盐及其催化氧化四氢噻吩的性能[J]. 功能高分子学报, 2020, 33(6): 580-588. doi: 10.14133/j.cnki.1008-9357.20200228001
    LIU Yefeng, LYU Ying, LI Ruiqi, ZUO Peng, WANG Ruixin. Magnetic Chitosan-Supported Polyoxometalates and Its Catalytic Oxidation of Tetrahydrothiophene[J]. Journal of Functional Polymers, 2020, 33(6): 580-588. doi: 10.14133/j.cnki.1008-9357.20200228001
    Citation: LIU Yefeng, LYU Ying, LI Ruiqi, ZUO Peng, WANG Ruixin. Magnetic Chitosan-Supported Polyoxometalates and Its Catalytic Oxidation of Tetrahydrothiophene[J]. Journal of Functional Polymers, 2020, 33(6): 580-588. doi: 10.14133/j.cnki.1008-9357.20200228001

    磁性壳聚糖负载多金属氧酸盐及其催化氧化四氢噻吩的性能

    Magnetic Chitosan-Supported Polyoxometalates and Its Catalytic Oxidation of Tetrahydrothiophene

    • 摘要: 将多金属氧酸盐(POM)通过静电结合法负载在磁性壳聚糖(Fe3O4@CS)载体上,成功制备了磁性多金属氧酸盐微球Fe3O4@CS@POM,即Keggin型磁性磷钨酸(Fe3O4@CS@PW12)和Dawson型磁性磷钨酸(Fe3O4@CS@P2W17和Fe3O4@CS@P2W18)。通过傅里叶红外光谱(FT-IR)、紫外-可见(UV-Vis)分光光度法、元素分析(EA)、扫描电子显微镜(TEM)等对其结构和形貌进行了表征;详细考察了Fe3O4@CS@POM对过氧化氢氧化四氢噻吩的催化活性。结果表明3种磁性磷钨酸均对四氢噻吩(THT)具有良好的催化氧化能力,其中Fe3O4@CS@PW12的催化活性最强:在常温、较低的Fe3O4@CS@PW12用量(0.01 g)下,反应105 min时THT的转化率达100%。该催化氧化过程符合准一级动力学模型。在外加磁场的作用下,催化剂可实现快速、高效分离。此外,Fe3O4@CS@PW12具有良好的重复使用性,循环使用5次后催化活性仍保持稳定。

       

      Abstract: Firstly, Fe3O4 nanospheres were prepared by solvothermal method, which were used as magnetic cores and coated with chitosan (CS) crosslinked by glutaraldehyde. Then, polyoxometalate (POM) was supported onto the magnetic CS carriers by electrostatic bonding and three magnetic polyoxometalates microspheres (Fe3O4@CS@POM) were prepared, including Keggin type magnetic phosphotungstic acid (Fe3O4@CS@PW12) and Dawson type magnetic phosphotungstic acid (Fe3O4@CS@P2W17 and Fe3O4@CS@P2W18). Their structures and morphologies were characterized by FT-IR、UV-Vis、EA and TEM. The catalytic activity of Fe3O4@CS@POM on tetrahydrothiophene (THT) was investigated in detail. It is shown that all the three kinds of Fe3O4@CS@POM microspheres have good catalytic oxidation abilities to THT, among which Fe3O4@CS@PW12 shows the best catalytic activity. The conversion of THT could reach 100% at room temperature after 105 min with a small amount of Fe3O4@CS@PW12 (0.01 g). The catalytic oxidation process follows the quasi-first order kinetic model. The catalyst could be separated quickly and efficiently in the external magnetic field. In addition, Fe3O4@CS@PW12 has good reusability, and the catalytic activity remains stable after 5 cycles.

       

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