以水杨醛乙二胺席夫碱和甲基丙烯酸为双功能单体,采用微波辅助反相乳液聚合法合成了席夫碱铜离子印迹聚合物[Cu(Ⅱ)-IIP]。通过对样品浓度、时间、pH、温度等一系列单因素条件的优化,得出在最佳条件下,Cu(Ⅱ)-IIP对Cu2+的饱和吸附量为107.25mg/g,是相同条件下Cu(Ⅱ)-NIP的2.7倍。对吸附数据进行拟合后发现,Cu(Ⅱ)-IIP对Cu2+的吸附过程符合Freundlich等温吸附模型,且准二级动力学模型(R2>0.99)能更好地描述其动力学行为。通过对固相萃取条件进行优化,发现最优条件为:Cu2+的质量浓度为10μg/L,pH=7。且该固相萃取柱重复使用5次后,萃取效率几乎没有变化。该方法的检出限为0.7764μg/L,相对标准偏差为2.59%,表明该方法对废水中的Cu2+的分析具有良好的精密度。
Schiff base copper ion imprinted polymer (Cu(Ⅱ)-IIP) was synthesized by microwave-assisted inverse emulsion polymerization with salicylaldehyde Schiff base and methacrylic acid as a bifunctional monomer.Through the optimization of a series of single factor conditions such as sample concentration,time,pH and temperature,it was found that under the optimum conditions,the saturated adsorption capacity of Cu(Ⅱ)-IIP to Cu(Ⅱ) was 107.25mg/g,which was 2.7 times of that of Cu(Ⅱ)-NIP under the same conditions.After fitting the adsorption data,it was found that the adsorption process of Cu(Ⅱ)-IIP on Cu(Ⅱ) was in accordance with Freundlich isotherm adsorption model,and the pseudo-second order kinetic model (R2>0.99) can better describe its dynamic behavior.Through the optimization of solid-phase extraction conditions:the mass concentration of Cu(Ⅱ) was 10μg/L,pH=7.After the solid-phase extraction column was reused for 5 times,the extraction efficiency was almost unchanged.The detection limit of this method was 0.7764μg/L,and the relative standard deviation was 2.59%,which shown that this method had a good precision for the analysis of Cu(Ⅱ) in wastewater.
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基金资助
国家自然科学基金(21276174);山西省基础研究计划项目(2013011040-1、201801D121267);太原理工大学大学生创新创业训练计划项目(19085)
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