In-situ fabrication of reduced graphene oxide/leucomethylene blue/platinum nanoparticles modified electrode for voltammetric determination of trace Fe(II) in seawater

• Published in: Microchemical journal Vol. 151; p. 104210
• Main Authors: Ma, Su, Pan, Dawei, Wei, Hong, Wang, Ning, Pan, Fei, Kang, Qi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2019
• Subjects: Fe(II); In-situ fabrication; Leucomethylene blue; Reduced graphene oxide; Seawater; Leucomethylene blue; Reduced graphene oxide; In-situ fabrication; Fe(II); Seawater
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2019.104210

In this work, the modified electrode based on composites of reduced graphene oxide/leucomethylene blue/platinum nanoparticles (rGO/LMB/PtNPs) was fabricated in-situ via an electron relay effect. Cationic dye of methylene blue (MB) was absorbed on the surface of graphene oxide (GO) with through π-π bond interactions. Then PtCl62− ions were self-assembled on the surface of the composites of GO/MB through Coulomb interactions. Using NaBH4 as the reducing agent, PtNPs were formed and GO was reduced to rGO. With the aid of PtNPs, MB was catalytically degraded to LMB and a rGO/LMB/PtNPs modified electrode was successfully prepared in situ. Due to the excellent electrochemical properties of rGO and the well-established assistant reductant of MB, as well as the catalytic amplifying effect of PtNPs, this as prepared rGO/LMB/PtNPs modified electrode showed excellent properties for the voltammetric determination of Fe(II) with the linear range of 0.01 to 2 μM and a detection limit of 3 nM. This modified electrode was successfully applied to detect the content of Fe(II) in seawater. •rGO/LMB/PtNPs were fabricated in-situ via an electron relay effect.•rGO/LMB/PtNPs modified GC electrode was successfully fabricated.•The contents of Fe(II) in seawater were detected by the functional modified electrode.•The functional modified electrode has a great potential in marine electroanalysis.