摘要
以镍(Ⅱ)离子为模板,丙烯酰胺为功能单体,二乙烯基苯为交联剂,偶氮二异丁腈为引发剂,甲醇为溶剂,采用本体聚合法制备了镍离子(Ⅱ)印迹聚合物。用红外光谱对镍离子印迹聚合物的结构进行表征,红外光谱研究表明聚合物中存在与模板分子相互作用的特征基团。通过研究Ni2+与单体的物质的量之比、单体与交联剂的物质的量之比、溶剂量对镍离子(Ⅱ)印迹聚合物吸附性能的影响,发现Ni2+与功能单体物质的量之比为1∶4,功能单体与交联剂物质的量之比为1∶5,溶剂体积为10 mL时制备的聚合物具有最佳吸附能力。结果表明该镍离子(Ⅱ)印迹聚合物对Ni2+具有良好的吸附性、选择性和亲和性,其最大吸附量为1.26 mg/g,与饱和吸附量Qmax=1.35 mg/g基本相符,达到吸附平衡的时间为35 min,最佳吸附pH=8.0,相对其它金属离子的相对选择系数(K′)远大于1,表明该镍离子印迹聚合物对镍离子有明显的选择识别能力,且重复性好。
A new nickel （ Ⅱ ） ion-imprinted polymer （IIP） material was synthesized by using bulk polymerization of acrylamide as monomer, divinylbenzene as crosslinking agent, 2, 2-azobis-sobutyronitrile as initiator and methanol as solvent in the presence of nickel（ Ⅱ ）. The structure of polymer was studied by IR spectrometry. The result indicated that some characteristic groups in the ion-imprinted polymer interacted with the template. To get the optimal reaction conditions, the effect of the molar ratio of Ni^2＋/monomer and monomer/crosslinker, and the volume of solvent on adsorption properties of Ni （ Ⅱ ） imprinted polymers was investigated. The best adsorption capacity of the polymer adsorbent was obtained when uisng Ni （Ⅱ ） - functional monomer of 1 ： 4 （ molar ratio）, functional monomer- crosslinking agent of 1 ： 5 （molar ratio） and solvent volume of 10 mL. The adsorption and selectivity capacity of nickel （ Ⅱ） ion-imprinted polymer for Ni （ Ⅱ ） ion were studied. The results showed that the imprinted polymer had good affinity for Ni^2＋ The maximum adsorption capacity was 1.26 mg/g, which corresponded with the saturated adsorption （ Q ） of 1.35 mg/g. The sorption equilibrium time was 35 min and the optimum pH for quantitative nickel retention was 8.0. The relatively selective factor（K＇） of Ni to other metal ions were greater than I. The lip could be repeatedly used with high selectivity and stability for Ni（ Ⅱ）.
出处
《分析测试学报》
CAS
CSCD
北大核心
2011年第2期135-139,145,共6页
Journal of Instrumental Analysis
关键词
镍离子
离子印迹聚合物
选择性吸附
nickel（ Ⅱ）
ion-imprinted polymer
selective adsorption
