Electrochemical sensor using graphene/Fe3O4 nanosheets functionalized with garlic extract for the detection of lead ion
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Based on the modulated electronic properties of Fe3O4-graphene (Fe3O4/GN composite) as well as the outstanding complexation between Pb2+ and natural substances garlic extract (GE), a novel electrochemical sensor for the determination of Pb2+ in wastewater was prepared by immobilization of Fe3O4/GN composite integrated with GE onto the surface of glassy carbon electrode (GCE). Fe3O4/GN composite was employed as an electrochemical active probe for enhancing electrical response by facilitating charge transfer while GE was used to improve the selectivity and sensitivity of the proposed sensor to Pb2+ assay. The electrochemical sensing performance toward Pb2+ was appraised by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and square wave voltammetry (SWV). Under the optimized condition, the sensor exhibited two dynamic linear ranges (LDR) including 0.001 to 0.5 nM and 0.5 to 1000 nM with excellent low detection limit (LOD) of 0.0123 pM (S/N = 3) and quantification limit (LOQ) of 0.41 pM (S/N = 10). Meanwhile, it displayed remarkable stability, reproducibility (RSD of 3.61%, n = 3), and selectivity toward the assay for the 100-fold higher concentration of other heavy metal ions. Furthermore, the novel sensor has been successfully employed to detect Pb2+ from real water samples with satisfactory results.
KeywordsGarlic extract Lead(II) Fe3O4/GN Electrochemical sensor
This work was supported by the National Natural Science Foundation of China (No. 31101284), the Graduate Research and Innovation Foundation of Chongqing, China (No. CYS17017), Chongqing Science and Technology Commission (No. CSTC2015shmszxl20097 and CSTC2017shmsA100010), the Fundamental Research Funds for the Central Universities (No. 2018CDXYHG0028), and the Chongqing University Student Research Training Program (No. CQU-SRTP-2016330 and CQU-SRTP-2016337).
- 6.Piątkowska E, Kopeć A, Leszczyńska T (2015) Basic chemical composition, content of micro- and macroelements and antio xidant activity of different varieties of garlic’s leaves Polish origin. ŻYWNOŚĆ. Nauka. Technologia. Jakość 1:181–192Google Scholar
- 7.Szychowski KA, Binduga UE, Rybczyńska-Tkaczyk K, Leja ML, Gmiński J (2016) Cytotoxic effects of two extracts from garlic (Allium sativum L.) cultivars on the human squamous carcinoma cell line SCC-15. Saudi J Biol Sci. doi: https://doi.org/10.1016/j.sjbs.2016.10.005
- 32.Qin D, Gao S, Wang L, Shen H, Yalikun N, Sukhrobov P, Wagberg T, Zhao Y, Mamat X, Hu G (2017) Three-dimensional carbon nanofiber derived from bacterial cellulose for use in a Nafion matrix on a glassy carbon electrode for simultaneous voltammetric determination of trace levels of Cd(II) and Pb(II). Microchim Acta 184(8):2759–2766CrossRefGoogle Scholar
- 33.Pérez-Ràfols C, Bastos-Arrieta J, Serrano N, Díaz-Cruz JM, Ariño C, Pablo JD, Esteban M (2017) Ag nanoparticles drop-casting modification of screen-printed electrodes for the simultaneous voltammetric determination of Cu(II) and Pb(II). Sensors-Basel 17(6):1458–1469CrossRefPubMedCentralGoogle Scholar
- 37.Atarod M, Nasrollahzadeh M, Sajadi SM (2015) Green synthesis of a Cu/reduced graphene oxide/Fe3O4 nanocomposite using Euphorbia wallichii leaf extract and its application as a recyclable and heterogeneous catalyst for the reduction of 4-nitrophenol and rhodamine B. RSC Adv 5(111):91532–91543CrossRefGoogle Scholar