Journal
MICROCHEMICAL JOURNAL
Volume 175, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2021.107078
Keywords
Au-Bi bimetallic nanoparticles; Reduced graphene oxide; Electrochemical determination; Heavy metals; Differential pulse anodic stripping voltammetry
Categories
Funding
- National Natural Science Foundation of China [21675139, 21876144, 21974120]
- Natural Science Foundation of Jiangsu Province [BK20191479]
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In this study, rGO/Au-Bi nanocomposites were successfully synthesized and used for simultaneous electrochemical determination of Pb2+ and Cd2+. The results showed that under optimized conditions, the proposed electrode exhibited good linearity and low detection limits for Pb2+ and Cd2+. The electrode also demonstrated excellent resistance to interference, high stability, and good repeatability.
A reduced graphene oxide supported Au-Bi bimetallic nanoparticles (rGO/Au-Bi) have been synthesized and employed as a novel sensing platform for electrochemical determination of Pb2+ and Cd2+ simultaneously. The successful formation of rGO/Au-Bi nanocomposites was investigated by means of transmission electron microscopy and X-ray photoelectron spectroscopy. At the rGO/Au-Bi nanocomposites modified electrode, two well resolved voltammetric peaks for Pb2+ and Cd2+ were observed in differential pulse anodic stripping voltammetry (DPASV) measurements. Under the optimized conditions (pH 4.5, deposition potential-1.0 V, deposition time 200 s), the DPASV response currents demonstrated good linearity with the concentration of Pb2+ (0.1-500 mu g L-1) and Cd2+ (0.1-300 mu g L-1). The detection limits was 0.05 mu M for Pb2+ and 0.02 mu M for Cd2+, respectively. In addition, the proposed electrode exhibited outstanding resistance to potentially interferents, high stability and excellent repeatability. Satisfactory application of proposed electrode was also demonstrated by the determination of Pb2+ and Cd2+ in real river water samples.
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