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铂(Ⅳ)和铑(Ⅲ)离子印迹聚合物的制备、性能及应用研究
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摘要
本文在查阅了大量文献的基础上,对铂的性质、用途特别是铂的分离分析方法进行了简单总结后,选择了离子印迹技术来制备铂和铑的分离材料。具体研究工作内容如下:1.铂离子印迹聚合物的制备、性能及应用研究
     为了制备对Pt(IV)具有选择性识别能力的材料用于铂的分离富集,本实验一是利用紫外光谱法和计算模拟技术研究了模板PtC162与几种功能单体的结合情况,计算了结合常数、结合比和结合反应的反应能量,推测了PtCl62-与不同功能单体结合的可能位点;二是优化了以单一功能单体和混合功能单体制备铂离子印迹聚合物的制备条件,包括模板种类、功能单体种类与用量以及交联剂用量和聚合方法;三是测定了聚合物的吸附特征参数,并用IR、扫描电镜以及比表面分析法表征了聚合物的结构;四是用优化得到的铂离子印迹聚合物作为固相萃取剂,在优化了固相萃取条件,包括上样、非特异性淋洗、特异性洗脱的条件后,建立了一个分禺Pt(IV)的固相萃取方法。实验结果表明,以NAU为单一功能单体,PtC162为模板,甲醇为致孔剂,用沉淀聚合法在固定模板、功能单体、交联剂(EGDMA)的加入摩尔比为1:4:50的条件下制备的铂离子印迹聚合物(定义为IIP15)具有理想的吸附性能,在Pt(IV)的起始浓度为0.04mg/mL时,其平衡吸附量为8.34mg/g,印迹因子为1.72。用100mg该印迹聚合物制备的固相萃取柱,在保持固相萃取仪转速为5rmp的条件下,采用0.5mL Pt(IV)含量不高于50μg的样品溶液(调节pH到7.0)上样,然后用1mL pH5.4的水溶液对柱子进行非特异性淋洗,再用3mLlmol/L的HCl溶液对柱子进行特异性洗脱,萃取回收率可以达到79.9%以上,且经过非特异性淋洗后,其它铂族金属离子如Pd(II). Rh(III)、Ir(IV)和Ru(III)基本不被柱子所保留,证明所建立的方法以及所制备的铂离子印迹聚合物都具有实际应用价值。
     2.铑离子印迹聚合物的制备与性能研究
     以RhCl63为模板,丙烯酰胺(AM)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,甲醇为致孔剂,在优化了功能单体用量、交联剂用量及聚合方法等聚合条件后,固定模板、功能单体及交联剂的加入摩尔比为1:1:40,用沉淀聚合法制备了一个对Rh(III)具有较好吸附性能与吸附平衡速度的离子印迹聚合物,它在Rh(III)的起始浓度为10μg/mL的溶液中对Rh(III)的平衡吸附量为4.45mg/g,印迹因子为1.71。Scatchard分析结果表明,该印迹聚合物对Rh(Ⅲ)的吸附存在高、低亲和性两类结合位点,这两类结合位点的离解常数Kd分别为95.60μg/mL和22.49μg/mL,饱和结合位点数Q.max分别为24.70mg/g和54.03mg/g。
The ion imprinted technique was considered to use for the preparation of the separation materials for platinum and rhodium after the properties, especially the basic methods for separation, enrichment and detection of platinum were reviewed based on a large number of literatures consulted. The results of this thesis showed as follows:
     1. Study on the preparation, performance and application of Pt(IV) ion imprinted polymer
     To preparation of a material with selective recognition for preconcentration and separation of platinum, the ion imprinting technique was used in the paper. Firstly, the interaction between template PtCl62-and several functional monomers including the binding constant, bonding ratio and reaction energy of bonding were studied by ultraviolet spectrum (UV) and computer simulation technology. Secondingly, the preparation conditions of the Pt(IV) ion imprinted polymers (IIPs) with single functional monomer and mixed functional monomer were optimized. Those conditions included type of template and functional monomer, combinations of functional monomer and cross-linker (EGDMA) together with the polymerization method. Thirdly, the adsorption parameters as well as the structure and surface morphology of the obtained polymers were studied by the rebinding experiment, IR spectrum and scanning electron microscopy (SEM), respectively. Finally, an ion-imprint based solid phase extraction (IIP-SPE) method was developed by using the obtained polymer particles as sorbent after the experimental parameters in the step of loading, washing and eluting affecting the extraction efficiency and selectivity were studied carefully. The results indicated that the imprinted polymer (IIP15) prepared by the precipitation polymerization with PtCl62-as template, N-allylurea (NAU) as functional monomer and the ratio of Pt (IV), NAU and EGDMA as1:4:50possessed the satisfactory adsorption properties. The adsorption capacity and imprinting factor of IIP15in the methanol solution containing0.04mg/mL Pt(IV) were obtained as8.34mg/g and1.72, respectively. The IIP-SPE extraction experiments revealed that the percent extraction of Pt (IV) was more that70%, while only few of the other platinum metals were extracted by the optimizatical extraction procedure. The IIP-SPE extraction procedure involved three steps, i.e. loading, washing and eluting. For loading, the sample solution was adjusted to pH7.0and passed through the column containing100mg of IIP15, at a rotation rate of solid-phase extraction instrument of5.0rmp. After loading, the column was washed with1.0mL of aqueous solution with pH5.4, and then eluted with3mL of1.0mol L-1HCl at the same rotation rate of the instrument. All of the experiment results proved the application value of obtained Pt(IV) ion imprinted polymers (IIP15) and ion-imprint based solid phase extraction method.
     2. Studies on preparation and properties of a Rh(III) ion imprinted polymer
     A Rh(III) ion imprinted polymer with satisfactory adsorption properties was obtained by precipitation polymerization with RhCl63-as template, acrylamide (AM) as functional monomer, EGDMA as crosslinker monomer, methoanol as porogen and the ratio of Rh(III), AM and EGDMA as1:4:40. The obtained IIPs showed a comparatively high adsorption capacity (4.45mg/g) and good selectivity (with the imprinting factor of1.71) in5mL of methanol solution containing10μg/mL Rh(III). The results obtained from Scatchard analysis pointed that there are two classes of binding sites existed in the obtained IIP with the dissociation constants of95.60μg/mL and22.49μg/mL, and the affinity binding sites of24.70mg/g and54.03mg/g, respectively.
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