AbstractThe authors report on the preparation of sol-gel coated magnetized carbon nanotubes whose surface were imprinted with Cd2+ ions and the application of these materials on selective preconcentration of Cd2+ ions in different water samples. Fe3O4 particles and tetraethyl orthosilicate were used as a magnetic ingredient and as a surface modifier for the carbon nanotubes, respectively. The Cd2+-imprinted polymer was prepared by grafting copolymerization of Cd2+ ions as template, methacryloylsulfamethizole and 2-vinylpyridine as polymerizable ligands, methacrylic acid as functional monomer, and ethyleneglycoldimethacrylate as crosslinker. The resulting magnetic nanoparticles were characterized by Fourier transform infrared spectrometry, the Brunauer-Emmett-Teller method, and by scanning electron microscopy. Isothermal absorption, absorption kinetics and selectivity were studied in detail. The experimental conditions were optimized. Figures of merit include (a) a maximum adsorption capacity of 81 mg·g−1; (b) relative selectivity coefficients of 2.41, 2.36, 1.41, 1.66, and 1.70 for Cd2+/Ni2+, Cd2+/Co2+, Cd2+/Zn2+, Cd2+/Cu2+, and Cd2+/Pb2+, respectively; (c) a detection limit of 0.29 ng·mL−1, (d) an enrichment factor of 55.5; (e) an intra-day precisions of 1.13%; and (f) an inter-day precision of 1.39%. The method was successfully applied to the determination of cadmium in spiked samples including feed water of an ammonia production unit, tap water, industrial waste water from a petrochemical plant, river water from the Garrahi River, bay water from Khor Musa, and marsh water from the Shadegan wetland. Graphical AbstractTrace amounts of Cd2+ ions in some environmental and industrial water samples were separated and preconcentrated by a new surface ion-imprinted polymer, chemically grafted on the surface of the magnetized carbon nanotubes, before determination using flame atomic absorption spectrometer.

中文翻译：

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通过磁化碳纳米管的表面印迹合成离子印迹吸附剂，用于测定痕量镉离子

摘要 作者报道了表面印有 Cd2+ 离子的溶胶-凝胶涂层磁化碳纳米管的制备以及这些材料在不同水样中选择性富集 Cd2+ 离子的应用。Fe3O4 颗粒和原硅酸四乙酯分别用作磁性成分和碳纳米管的表面改性剂。以Cd2+离子为模板剂，甲基丙烯酰磺胺二甲嘧啶和2-乙烯基吡啶为可聚合配体，甲基丙烯酸为功能单体，乙二醇二甲基丙烯酸酯为交联剂，接枝共聚制备了Cd2+印迹聚合物。通过傅里叶变换红外光谱、Brunauer-Emmett-Teller 方法和扫描电子显微镜对所得磁性纳米粒子进行表征。等温吸收，详细研究了吸收动力学和选择性。优化了实验条件。品质因数包括 (a) 最大吸附容量为 81 mg·g-1；(b) Cd2+/Ni2+、Cd2+/Co2+、Cd2+/Zn2+、Cd2+/Cu2+和Cd2+/Pb2+的相对选择性系数分别为2.41、2.36、1.41、1.66和1.70；(c) 检测限为 0.29 ng·mL-1， (d) 富集因子为 55.5；(e) 日内精确度为 1.13%；(f) 日间精度为 1.39%。该方法已成功应用于氨生产装置给水、自来水、石化厂工业废水、Garrahi河河水、Khor Musa海湾水和沼泽水等加标样品中镉的测定。沙德干湿地。