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通过胺化反应合成了系列多胺类螯合树脂,其中优选的PAMD树脂对于Cu(Ⅱ)的吸附容量高达2.24mmol/g,是商业树脂S984的1.3倍。通过对比PAMD树脂在Cu(Ⅱ)/Ni(Ⅱ)体系、Cu(Ⅱ)/Zn(Ⅱ)体系和Zn(Ⅱ)/Ni(Ⅱ)体系中的吸附行为,发现其吸附选择性遵循Cu(Ⅱ)>Zn(Ⅱ)>Ni(Ⅱ)。Extended Langmuir模型对双组份吸附行为模拟吻合程度较高。PAMD树脂对Cu(Ⅱ)、Ni(Ⅱ)的选择性系数最高达1177.13,远高于同初始浓度的Zn(Ⅱ)、Ni(Ⅱ)的选择性系数9.22。在重金属离子共存体系中,各离子相互作用表现为对吸附活性位点的直接竞争效应以及阴离子的促进效应。
A series of polyamine chelating resins were synthesized by amination reaction. The preferred PAMD resin has an adsorption capacity of 2.24 mmol / g for Cu (Ⅱ), which is 1.3 times that of commercial resin. By comparing the adsorption behavior of PAMD resin in Cu (Ⅱ) / Ni (Ⅱ) system, Cu (Ⅱ) / Zn (Ⅱ) system and Zn (Ⅱ) / Ni (Ⅱ) system, Ⅱ)> Zn (Ⅱ)> Ni (Ⅱ). The Extended Langmuir model has a good agreement with the bi-component adsorption behavior. The selectivity coefficient of PAMD resin to Cu (Ⅱ) and Ni (Ⅱ) is up to 1177.13, much higher than that of Zn (Ⅱ) and Ni (Ⅱ) with the initial concentration of 9.22. In the system of heavy metal ions coexistence, the interaction of ions shows the direct competitive effect on the active site of adsorption and the promoting effect of anions.