Bai Huiping, Xiong Caiyun, Wang Chunqiong, Liu Peng, Dong Su, Cao Qiue
School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China.
J Nanosci Nanotechnol. 2018 May 1;18(5):3577-3584. doi: 10.1166/jnn.2018.14667.
A rhodium (III) ion carbon paste electrode (CPE) based on an ion imprinted polymer (IIP) as a new modifying agent has been prepared and studied. Rh(III) ion imprinted polymer was synthesized by copolymerization of acrylamide-Rh(III) complex and ethylene glycol dimethacrylate according to the precipitation polymerization. Acrylamide acted as both functional monomer and complexing agent to create selective coordination sites in a cross-linked polymer. The ion imprinted carbon paste electrode (IIP-CPE) was prepared by mixing rhodium IIP-nanoparticles and graphite powder in n-eicosane as an adhesive and then embedding them in a Teflon tube. Amperometric i-t curve method was applied as the determination technique. Several parameters, including the functional monomer, molar ratio of template, monomer and cross-linking agent, the amounts of IIP, the applied potential, the buffer solution and pH have been studied. According to the results, IIP-CPE showed a considerably higher response in comparison with the electrode embedded with non-imprinted polymer (NIP), indicating the formation of suitable recognition sites in the IIP structure during the polymerization stage. The introduced electrode showed a linear range of 1.00×10-83.0×10-5 mol·L-1 and detection limit of 6.0 nmol L-1 (S/N = 3). The IIP-CPE was successfully applied for the trace rhodium determination in catalyst and plant samples with RSD of less than 3.3% (n = 5) and recoveries in the range of 95.5102.5%.
制备并研究了一种基于离子印迹聚合物（IIP）作为新型改性剂的铑（III）离子碳糊电极（CPE）。通过丙烯酰胺 - 铑（III）配合物与乙二醇二甲基丙烯酸酯的沉淀聚合反应合成了铑（III）离子印迹聚合物。丙烯酰胺既作为功能单体又作为络合剂，在交联聚合物中形成选择性配位位点。离子印迹碳糊电极（IIP - CPE）是通过将铑离子印迹聚合物纳米颗粒与石墨粉在正二十烷中作为粘合剂混合，然后将它们嵌入聚四氟乙烯管中制备而成。采用安培i - t曲线法作为测定技术。研究了几个参数，包括功能单体、模板、单体和交联剂的摩尔比、IIP的量、施加电位、缓冲溶液和pH值。结果表明，与嵌入非印迹聚合物（NIP）的电极相比，IIP - CPE显示出更高的响应，表明在聚合阶段IIP结构中形成了合适的识别位点。所介绍的电极线性范围为1.00×10 - 83.0×10 - 5 mol·L - 1，检测限为6.0 nmol L - 1（S/N = 3）。IIP - CPE成功应用于催化剂和植物样品中痕量铑的测定，相对标准偏差小于3.3%（n = 5），回收率在95.5102.5%范围内。
