以介孔材料为基底的表面离子印迹聚合物的制备及表征

发布时间：2018-03-18 09:03

本文选题：离子印迹聚合物　切入点：表面印迹技术　出处：《青海大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着社会经济的不断发展,水环境污染日益严重,吸附法处理含金属离子废水具有操作简单,去除效率高等优点已得到了广泛应用。然而,传统吸附剂去除金属离子存在选择性差、水热稳定性低、循环使用性不好等不足。近年来,具有特异识别功能的离子印迹聚合物得到越来越多的关注。其中,表面印迹技术又因其结合位点被限定在具有良好可接近性的材料表面上,吸附速度更快,识别性更好,离子印迹更容易洗脱等优点而被深入研究。本论文分别以硅胶、SBA-15为基底材料,采用表面印迹技术,制备离子表面印迹聚合物。利用红外光谱(FT-IR)、能量色散X射线谱(EDS)、X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、氮气吸附-脱附、热重分析(TGA)等测试手段对产物进行表征。研究所制备材料的吸附性能,包括平衡吸附时间、平衡吸附量,选择性及循环使用性能等。具体研究结果如下:(1)以钴离子为模板离子,硅胶为基底,(3-巯基丙基)三甲氧基硅烷为功能单体,环氧氯丙烷为交联剂,采用表面印迹技术制备并表征了钴离子印迹聚合物(Co(II)-IIP),吸附结果表明,在25°C,pH=5~6时,最大吸附量为20.05 mg/g。Co(II)-IIP对Co(II)/Cd(II)、Co(II)/Pb(II)、Co(II)/Cu(II)、Co(II)/Ni(II)吸附选择性系数分别为2.52、1.34、3.61、4.39。经5次吸附-解吸循环后,Co(II)-IIP对钴离子的吸附效果并没有明显下降,表明Co(II)-IIP具有一定的循环利用性能。(2)以SBA-15为基底,铜离子为模板离子,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,成功制备了Cu(II)-IIP。研究结果表明,在25°C、pH=7时,最大吸附量为25.03 mg/g。Cu(II)-IIP对Cu(II)具有较好的选择性。(3)采用表面印迹技术,以铯离子为模板,壳聚糖为功能单体,在介孔材料SBA-15表面进行氨基化、醛基化修饰,成功制备了Cs(I)-IIP。对产物进行了充分表征。结果表明,Cs(I)被成功印迹,且Cs(I)-IIP仍保持着有序介孔结构。研究了Cs(I)-IIP对水溶液中Cs(I)的吸附性能,在25°C,pH=5~6,最大吸附量为36.19 mg/g,Cs(I)-IIP对Cs(I)具有较好的选择性。
[Abstract]:With the development of society and economy, the pollution of water environment is becoming more and more serious. The treatment of metal-ion wastewater by adsorption method has many advantages such as simple operation, high removal efficiency and so on. However, the adsorption method has been widely used in the treatment of wastewater containing metal ions. The removal of metal ions by traditional adsorbents has some disadvantages, such as poor selectivity, low hydrothermal stability and poor recycling. In recent years, ionic imprinted polymers with specific recognition function have attracted more and more attention. Surface imprinting technology, because its binding sites are confined to the surfaces of materials with good accessibility, are faster to adsorb and more recognizable. Ion imprinting is more easy to be eluted and has been studied deeply. In this thesis, silicon gel SBA-15 was used as substrate material, and surface imprinting technique was used. Ion surface imprinted polymers were prepared by FTIR spectroscopy, energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption. Thermogravimetric analysis (TGA) and other testing methods were used to characterize the product. The adsorption properties of the prepared materials, including equilibrium adsorption time, equilibrium adsorption capacity, selectivity and recycling performance, were investigated. The specific results are as follows: 1) the cobalt ion is used as the template ion. The cobalt ion imprinted polymer, CoHI-IIPN, was prepared and characterized by surface imprinting technique with silica gel as substrate, trimethoxysilane as functional monomer and epichlorohydrin as crosslinking agent. The adsorption results showed that the pH value of the imprinted polymer was 5 ~ 6:00 at 25 掳C ~ (-1). The maximum adsorption capacity is 20.05 mg/g.Co(II)-IIP. The adsorption selectivity coefficient of CoII / NII / NiII / CoII / NII / NII / NII / NII / NII / NII / NII / NII / NII / NII / NII is 2.52 / 1.343.61N / 4.39.The adsorption effect of CoIII-IIP on cobalt ion has not been significantly decreased after five adsorption-desorption cycles, indicating that Co(II)-IIP has a certain recycling performance. (2) on the basis of SBA-15, the adsorption efficiency of CoIII-IIP is not significantly decreased, which indicates that CoIII-IIP has a certain recycling performance on the basis of SBA-15, and the adsorption efficiency of CoIII-IIP is not significantly decreased after 5 times of adsorption-desorption cycles. Copper ion was used as template ion, methacrylic acid as functional monomer and ethylene glycol dimethacrylate as crosslinking agent. The maximum adsorption capacity was 25.03 mg/g.Cu(II)-IIP. The best selectivity was obtained by surface imprinting technique. Using cesium ion as template and chitosan as functional monomer, the surface of mesoporous SBA-15 was modified by amination and aldehydation. The products were successfully prepared and characterized. The results showed that the Cs(I)-IIP was imprinted successfully, and the Cs(I)-IIP still maintained an ordered mesoporous structure. The adsorption properties of Cs(I)-IIP for CSI in aqueous solution were studied. The maximum adsorption capacity is 36.19 mg / g / g CsSN I ~ (-) -IIP with a good selectivity for CSI at 25 掳C ~ (2 +) pH ~ (5 ~ (5)) ~ (6).
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O631.3

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