Cr(Ⅲ)离子印迹聚合物的制备及性能研究

Preparation and properties of chromium ion(Ⅲ)-imprinted polymers

  • 摘要: 以Cr(Ⅲ)为模板离子,采用表面印迹法,将氨基化多壁碳纳米管改性为乙烯化多壁碳纳米管作为固体基质, 通过印迹体系的优化,制备了一系列Cr(Ⅲ)离子印迹聚合物Cr(Ⅲ)-IIPs及相应的非印迹聚合物Cr(Ⅲ)-NIPs. 在较优实验条件下制备的Cr(Ⅲ)-IIP1,吸附量为3.82 mmol·g−1,印迹因子为1.65. 通过扫描电子显微镜(SEM)、氮气吸附/脱附(BET)、红外光谱(FIR)、热重分析(TG)等对Cr(Ⅲ)-IIP1及相应的Cr(Ⅲ)-NIP1,进行结构表征和性能评价. 研究结果表明,Cr(Ⅲ)-IIP1属于热稳定性良好的吸附材料,吸附行为符合准二级动力学模型和Freundlich等温吸附模型,以化学吸附和多分子层吸附为主;在“竞争离子”Co (Ⅱ)、Ni (Ⅱ)和Pb (Ⅱ)共存条件下,对Cr(Ⅲ)离子具有较强的吸附能力和良好的选择性. 说明在较优实验条件下制备的Cr(Ⅲ)-IIP1,有望作为一种新型的Cr(Ⅲ)离子吸附材料,去除和回收废水中的Cr(Ⅲ)离子.

     

    Abstract: Using Cr(Ⅲ) as the template ion and surface imprinting method, aminoated AMWN were modified to VMWCNTS as the solid matrix, through the optimization of the imprinting system, a series of chromium ion(Ⅲ)-imprinted polymers Cr(Ⅲ)-IIPs and corresponding non-imprinted polymers Cr(Ⅲ)-NIPs were prepared. The adsorption capacity and imprinting factor of Cr(Ⅲ)-IIP1 prepared under optimal experimental conditions were 3.82 mmol·g−1 and 1.65, respectively. The structure and performance of Cr(Ⅲ)-IIP1 and the corresponding Cr(Ⅲ)-NIP1 were characterized by scanning electron microscopy (SEM) nitrogen adsorption (BET), infrared spectroscopy (FIR) and thermogravimetric analysis (TG). The results showed that Cr(Ⅲ)-IIP1 was an adsorbent with good thermal stability. The adsorption behavior conformed to the quasi-second-order kinetic model and Freundlich isothermal adsorption model, and the chemisorption and multimolecular layer adsorption were the main adsorption methods. Under the co-existence of competing ions Co (Ⅱ), Ni (Ⅱ) and Pb (Ⅱ), the adsorption capacity of Cr(Ⅲ) ions was strong and the selectivity was good. It indicated that Cr(Ⅲ)-IIP1 prepared under better experimental conditions was expected to be used as a new type of Cr(Ⅲ) ion adsorption material to remove and recover Cr(Ⅲ) ions from wastewater.

     

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