磁性碳包铁纳米粒子在重金属元素检测分离富集中的应用

以氩电弧等离子体法制备的碳包铁纳米粒子为固相萃取材料,采用等离子体原子发射光谱法(ICP-AES)系统研究了该材料对Cr、Ni、Cd、Pb离子的吸附性能,并确定了最佳吸附和洗脱条件。实验结果表明:当pH值为8.0～9.0时,分析物均可被碳包铁纳米粒子定量吸附;采用酸性溶液(pH=1.0～2.0)可将吸附在碳包铁纳米粒子上的金属离子完全脱附。该法对Cr、Ni、Cd、Pb的检出限分别为3.6、4.1、1.1、9.8μg/L,Cr、Ni、Cd的线性范围为1～500μg.L-1,Pb的线性范围为10～1 000μg.L-1,线性相关系数均大于0.999。方法用于自来水中Cr、Ni、Cd、Pb离子的测定,回收率可达到93%～105%;碳包铁纳米粒子对Cr、Ni、Cd、Pb离子的吸附量分别为3.6、4.8、6.3、2.1 mg/g。

Application of Magnetic Carbon-coated Iron Nanoparticles in Separation and Concentration of Heavy Metal Detection

An adsorption material of carbon-coated iron nanoparticles was synthesized by carbon arc discharge technology.The adsorption and elution behaviors of Cr,Ni,Cd and Pb ions on the above material were studied by inductively coupled plasma-atomic emission spectrometry.The results showed that the studied ions can be adsorbed quantitatively on the above material at pH 8.0-9.0 and the analytes adsorbed on carbon-coated iron nanoparticles can be eluted with acid solutions(pH=1.0-2.0).The detection limits of the method for Cr,Ni,Cd,Pb were 3.6,4.1,1.1,9.8 μg/L,respectively.The calibration curves were linear in the ranges of 1-500 μg/L for Cr,Ni,Cd and 10-1 000 μg/L for Pb,with correlation coefficients more than 0.999.The proposed method was applied in the determination of Cr,Ni,Cd,Pb ions in water sample and the recoveries reached 93%-105%.The adsorption capacities of carbon-coated iron nanoparticles for Cr,Ni,Cd and Pb ions were 3.6,4.8,6.3,2.1 mg/g,respectively.