Shamsabadi Ebrahim, Akhlaghi Hashem, Baghayeri Mehdi, Motavalizadehkakhky Alireza
Department of Chemistry, Sabzevar Branch, Islamic Azad University, Sabzevar, Iran.
Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P.O. Box 397, Sabzevar, Iran.
Sci Rep. 2024 Oct 23;14(1):25052. doi: 10.1038/s41598-024-77139-6.
This study introduces a novel ion-imprinted polymer for the ultrasensitive detection of mercury(II) in water. The ion-imprinted polymer was synthesized via a simple bulk polymerization process using methacrylic acid as the functional monomer, ethylene glycol dimethacrylate as the cross-linker, morpholine-4-carbodithioic acid phenyl ester as the chelating agent, and ammonium persulfate as the initiator. The electrochemical mercury(II) sensing capability of the ion-imprinted polymer was studied via the modification of a cost-effective carbon paste electrode. A stripping voltammetric technique was utilized to quantify the analyte ions following open-circuit enrichment. Critical experimental parameters, including the nature and concentration of the eluent, solution pH, preconcentration duration, ion-imprinted polymer dosage, sample solution volume and reduction potential, were systematically studied and optimized. Under optimal conditions, the sensor exhibited a linear response in the range of 1.0 to 240.0 nM, with a low detection limit of 0.2 nM. The sensor demonstrated remarkable selectivity against potential interfering ions, including lead(II), cadmium(II), copper(II), zinc(II), manganese(II), iron(II), magnesium(II), calcium(II), sodium(I) and cobalt(II). The practical applicability of the developed method was successfully validated through the analysis of real water samples, suggesting its potential for environmental monitoring applications.
本研究介绍了一种用于超灵敏检测水中汞（II）的新型离子印迹聚合物。该离子印迹聚合物通过简单的本体聚合过程合成，使用甲基丙烯酸作为功能单体，乙二醇二甲基丙烯酸酯作为交联剂，吗啉-4-碳二硫代酸苯酯作为螯合剂，过硫酸铵作为引发剂。通过修饰具有成本效益的碳糊电极，研究了离子印迹聚合物对汞（II）的电化学传感能力。采用溶出伏安法在开路富集后对分析物离子进行定量。系统研究并优化了关键实验参数，包括洗脱剂的性质和浓度、溶液pH值、预富集时间、离子印迹聚合物用量、样品溶液体积和还原电位。在最佳条件下，该传感器在1.0至240.0 nM范围内呈现线性响应，检测限低至0.2 nM。该传感器对包括铅（II）、镉（II）、铜（II）、锌（II）、锰（II）、铁（II）、镁（II）、钙（II）、钠（I）和钴（II）在内的潜在干扰离子表现出显著的选择性。通过对实际水样的分析，成功验证了所开发方法的实际适用性，表明其在环境监测应用中的潜力。
