Determination of Lead(II) Using Glassy Carbon Electrode Modified with Hexagonal Co₃O₄ Microparticles

摘要

In this study, cobaltosic oxide (Co3O4) was synthesized by a simple surfactant-free hydrothermalmethod. The as-prepared materials were characterized by scanning electron microscope and X-raydiffraction, indicating that Co3O4 is formed by stacked hexagonal microsheets. The as-obtainedmicrosheet-stacked Co3O4 was drop-coated on glassy carbon electrode (GCE) to allow the fabricationof electrochemical sensors for the detection of trace Pb2+ by square wave anodic strippingvoltammetry. The proposed Co3O4/GCE sensors exhibited a linear correlation for Pb2+ concentration inthe concentration range from 0.5 to 5 μM, and the limit of detection was calculated as 1.18×10-8 M(S/N=3). The results showed that the as-prepared Co3O4/GCE sensor had good repeatability andsensitivity and the ability to effectively avoid the interference from Cd2+ and Hg2+. In addition, themethod for the preparation of proposed sensor was simple and cost effective. Overall, this workprovides a promising material for electrochemical detection of heavy metal ions in water.