Cu(Ⅱ)印迹丙烯腈-co-苯乙烯微球的制备与对Cu(Ⅱ)的选择性吸附

Analysis of selective adsorption of Cu(Ⅱ) on Cu(Ⅱ)-imprinted acrylonitrile-co-styrene microspheres by FAAS

以Cu(Ⅱ)为模板离子、丙烯腈为功能单体,苯乙烯(St)为骨架单体,偶氮二异丁腈为引发剂,二乙烯苯为交联剂制备了铜离子印迹丙烯腈-co-苯乙烯微球(Cu-I-AN-co-St);用UV、FTIR、SEM和FAAS表征了聚合物和分析了Cu-I-AN-co-St对Cu(Ⅱ)的选择性吸附;结果表明,在室温下溶液pH为5～6,吸附时间为60 min时吸附达到平衡,最佳吸附条件下,饱和吸附容量可达到49.1 mg/g;以1 mol/L HCl溶液作为解吸剂其解吸率可达98%;与相应非印迹微球(NI-AN-co-St)相比,Cu(Ⅱ)I-AN-co-St对Cu(II)的吸附量增大并具有选择性;与电荷相同及离子半径相近的Zn(Ⅱ)、Ni(Ⅱ)、Cd(Ⅱ)共存时,其相对选择性系数分别为28.2,24.8,44.4。

Copper ion imprinted acrylonltrlle-co-styrene （Cu-I-AN-co-St） mlcrospneres were prepareu using Cu（Ⅱ）, acrylonitrile, styrene, azobisisobutyronitrile, divinylbenzene as template ions, a functional monomer, a framework monomer, an initiator, a crosslinking agent, respectively. The characterization of the imprinted polymer microsphere was carried out by UV, FTIR and SEM, and the static selective Cu（Ⅱ） time on Cu-I-AN-co-St microspheres was analyzed by was 60 min at room temperature, the maximum adsorpti Cu（Ⅱ） on of Cu FAAS. When pH of the solution was 5 -6 and adsorption adsorption capacity was 49 mg/g. 1 mol / L hydrochloric acid solution was used as a desorbent, the desorption efficiency was up to 98%. Compared to the corresponding non-imprinted polymer, the adsorption amount and selectivity of Cu（Ⅱ） on Cu（Ⅱ） I-AN-co-St microspheres increased. The relative selectivity coefficients were 28.2, 24.8, 44.4 when Cu（Ⅱ） coexisted with Zn（Ⅱ） Ni（Ⅱ）, Cd（Ⅱ） which have the same charge and similar ionic radius to Cu（Ⅱ）.