Functionalized graphene oxide GO-[imi-(CH2)2-NH2] as a high efficient material for electrochemical sensing of lead: Synthesis surface and electrochemical characterization

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-02, Vol.858, p.113784, Article 113784
• Main Authors: Eshlaghi, Maryam Abbasi, Kowsari, Elaheh, Ehsani, Ali, Akbari-Adergani, Behrouz, Hekmati, Malak
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Detection; Electrochemical analysis; Electrochemical sensing; Electrodes; Functional groups; Functionalized graphene; Graphene; Heavy metals; Imidazole; Lead; Metal ions; Pulse voltammetry; Surface area; Synthesis; XPS
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2019.113784

Recently, many efforts have been widely focused on developing heavy metal ion sensors, particularly Pb (II) sensing due to really dangerous effects towards environment and hygienic issues. To meet the highest productivity of that metal ion sensing, we incorporated functional group of imidazole-(CH2)2-NH2 on graphene oxide (GO- imi-(CH2)2-NH2) with large surface area and boosted conductivity. The structure of the as-synthesized GO- imi-(CH2)2-NH2 was characterized by commonly used techniques. The characterization results confirmed the successful synthesizing strategy of grafting functional GO-imi- (CH2)2-NH2-CPE surface with reliable Pb(II) sensor. According to ideal conditions, Pb(II) calibration diagram recorder linearly (−0.58 V), between the concentration range of 5.0–300.0 nM. High surface area and strong Pb(II) adsorption ability with welfare conductivity of modified electrode indicated good Pb(II) sensing with a detection limit of 0.30 nM. That electrode provided ease –NH2 groups incorporating to Pb (II) with a good reusability and reproducibility of 5 times and approximately 90%, respectively, Therefore, during the deposition process, Pb accumulation will be risen on the electrode surface. The Pb monitoring in aqueous media was developed through a thoroughly affordable and sensitive electrochemical sensing approach come up with this proposed sensor. [Display omitted] •Grafting imidazolium functional groups on GO surface•Fostering electron shifting process on the adjusted carbon paste surface•Sensitive and effective electrochemical sensor for Pb(II) determination•Easy Pb(II) coordinating with The –NH2 groups in GO-imi- (CH2)2-NH2/CPE•Reproducibility of more than 90% in Pb2+ sensing