Adsorption of Pb (Ⅱ) and Cu (Ⅱ) by a novel β-cyclodextrin polymer modified by amidoxime group [新型偕胺肟基改性β-环糊精聚合物对Pb(Ⅱ), Cu(Ⅱ)的吸附]

作者：Lai Z.; Xu M.; Hu Z.; Jiang H.^*

来源：Journal of Functional Materials, 2021, 52(6): 06180-06189.

DOI：10.3969/j.issn.1001-9731.2021.06.027

• Adsorbent
• Adsorption
• Heavy metals
• Modification
• β-cyclodextrin polymer

β-cyclodextrin (β-CD) monomer and tetrafluoroterephthalonitrile cross-linking agent are used to synthesize β-cyclodextrin cross-linked polymer (CDP-CN) and further reacted with hydroxylamine to obtain amidoxime modified β-cyclodextrin polymer adsorbent (CDP-AM). The adsorption effect of CDP-AM on Cu (Ⅱ) and Pb (Ⅱ) metal ions is studied. The structure of the polymer adsorbent is characterized by FT-IR, TGA, SEM, and XPS, and the degree of protonation is studied by the zeta potential. The effects of pH, initial concentration and adsorption time of the solution on the adsorption of Cu (Ⅱ) and Pb (Ⅱ) are investigated. The results show that the adsorption process is consistent with the Langmuir isothermal model and the pseudo-second-order model. The maximum adsorption capacities of Pb (Ⅱ) and Cu (Ⅱ) at 30 ℃ are 281.69 mg/g and 273.97 mg/g, respectively. The adsorption process of heavy metal ions on the polymer surface is endothermic and spontaneous. The order of adsorption and removal efficiency is Pb (Ⅱ)> Cu (Ⅱ). CDP-AM can remove heavy metal ions with high efficiency through static electricity and chelation, and maintain high efficiency after 5 adsorption-desorption cycles. Studies show that CDP-AM polymers are expected to be developed as reneractive adsorbents for the removal of heavy metals.

• 单位
  南昌航空大学