Synthesis and characterization of an ion-imprinted polymer for selective solid phase extraction of thorium(IV)
Synthesis and characterization of an ion-imprinted polymer for selective solid phase extraction of thorium(IV)
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用于选择性固相萃取钍(IV)的离子印迹聚合物的合成和表征
DOI：
10.1007/s00604-011-0576-5
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发表时间：
2011-06-01
影响因子：
5.7
通讯作者：
Yang, Shiqing
中科院分区：
文献类型：
--
作者：
Cheng, Zhiqiang;Wang, Hongqing;Yang, Shiqing
提出了一种以3-甲基-1-苯基-4-(顺丁烯酸)-2-吡唑啉-5-酮为功能试剂的新型表面离子印迹复合聚合物，可在光度测定前萃取和预富集痕量Th(IV)。考察了酸度、振荡时间、Th(IV)初始浓度、洗脱条件、样品流速、潜在干扰离子等因素对Th(IV)回收率的影响。在pH为4.5时，该材料的最大吸附容量为56.8 mg g-1，非印迹聚合物的最大吸附容量为26.3 mg g-1。回收率超过95%，在5分钟内完成。朗缪尔等温线符合实验数据。Th(IV)/U(VI)、Th(IV)/La(III)和Th(IV)/Ce(III)的相对选择性系数分别为50.8、78.3和82.6。相对标准偏差为2.5%，检出限为0.54µg L(-1)(3西格玛)。将印迹聚合物与分光光度法偶联，用于土壤标样中痕量Th(IV)的分离测定，结果满意。
A new surface ion-imprinted composite polymer containing 3-methyl-1-phenyl -4-(cis-acylbutenoic acid)-2-pyrazolin-5-one as the functional reagent is presented that is capable of extracting and preconcentrating traces of Th(IV) ion prior to its photometric determination. Parameters affecting the recovery of Th(IV) such as acidity, shaking time, initial concentration of Th(IV), elution condition, sample flow rate, and influence of potentially interfering ions were investigated. The maximum uptake capacity of this material and that of the non-imprinted polymer at pH 4.5 are 56.8 and 26.3 mg g(-1), respectively. Recovery exceeds 95% and is complete within 5 min. A Langmuir isotherm fits the experimental data. The relative selectivity factor for Th(IV)/U(VI), Th(IV)/La(III), and Th(IV)/Ce(III) are 50.8, 78.3, and 82.6, respectively. The relative standard deviation is < 2.5%, the detection limit is 0.54 mu g L(-1) (3 sigma). The imprinted polymer was coupled to spectrophotometry to separate and determine trace levels of Th(IV) in a soil standard material with satisfactory results.