电化学
壳聚糖
纳米材料
水溶液中的金属离子
材料科学
电极
纳米颗粒
金属
介电谱
循环伏安法
氧化还原
电化学气体传感器
碳纳米管
分析化学(期刊)
化学工程
核化学
纳米技术
化学
物理化学
冶金
有机化学
工程类
作者
Shaofeng Zhou,Xiaobin Han,Yaqing Liu
标识
DOI:10.1016/j.jallcom.2016.05.152
摘要
A high-activity, eco-friendly and inexpensive magnetic chitosan sensing nanomaterials were introduced for individual electrochemical detection toward Pb(II), Hg(II), Cu(II) and Cd(II) by square wave anodic stripping voltammetry (SWASV). The morphology and structure of Fe3O4-chitosan nanoparticles were characterized by TEM, XRD and FTIR respectively, and their electrochemical behavior based on the sensing materials modified glassy carbon electrode (GCE) was studied by cyclic voltammograms (CV) and electrochemical impedance spectra (EIS). Serving as a heavy metal ions sensor, the chitosan magnetic nanoparticles exhibited much more remarkable electrochemical response toward heavy metal ions. Especially, the introduction of chitosan significantly enhanced the SWASV performance toward Pb(II) with the high sensitivity of 50.6 μA/μM and LOD of 0.0422 μM, which was about 4.8 times than pure Fe3O4 nanoparticles. This result might be due to the strong charge-transfer interaction as well as the chelation and electrostatic interaction existence between Pb(II) and Fe3O4-chitosan unit, which will generate a high concentration region at electrode surface for efficient redox interaction between electrode and Pb(II). Furthermore, the Fe3O4-chitosan modified GCE offers good stability and potential practical applicability in the electrochemical determination of Pb(II). This work provides a potential simple and low cost material for electrochemical detection of toxic metal ions.
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