Abstract
As an efficient modified electrode material for the detection of heavy metal ions, bismuth nanoparticles (BiNPs) were loaded on cobalt ferrite (CoFe2O4), a unique magnetic photocatalytic material, to fabricate a highly sensitive sensor. The obtained BiNPs@CoFe2O4 nanocomposites showed excellent adsorption and electrical conductivity using a Square Wave Anodic Stripping Voltammetry (SWASV) detection method. Under optimized conditions, the BiNPs@CoFe2O4/GCE sensor could simultaneously determine Pb2+ and Cd2+, with detection limits of 7.3 and 8.2 nM, respectively. In addition, the BiNPs@CoFe2O4 exhibited acceptable reproducibility and good stability, which indicated great potential for the detection of heavy metal ions in reality.
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