Flower-like Bismuth Metal-Organic Frameworks Grown on Carbon Paper as a Free-Standing Electrode for Efficient Electrochemical Sensing of Cd2+ and Pb2+ in Water

Abstract

In this work, a free-standing electrode composed of bismuth terephthalate metal-organic frameworks grown on carbon paper (BiMOF/CP) was successfully prepared by a facile one-pot hydrothermal method. Materials characterization revealed the formation of flower-like ultrathin nanosheets of BiMOF fully covering on the microfibers of carbon paper. The BiMOF/CP was applied in the electrochemical detection of Cd 2+ and Pb 2+ in water. The BiMOF/CP electrode exhibited superior sensing performance with a linear detection of Cd 2+ and Pb 2+ with low detection limits of 1.5 μg/L for Cd 2+ and 2.7 μg/L for Pb 2+ , respectively. The significantly enhanced sensing performance compared to bare carbon paper is attributed to the 3D hierarchical architecture of BiMOF and increased number of exposed surface sites, facilitating the adsorption of metals ions and electron transfer. The prepared novel materials will contribute to the development of cost-effective electrochemical sensors for heavy metal detection. Fig. 1 XRD spectrum of pure CP, BiMOF and BiMOF/CP. 78 | Eng. Sci., 2018, 3, 77-83 © Engineered Science Publisher LLC 2018Fig. 2 SEM image of pure CP (a) and BiMOF/CP (b-d).Fig. 3 XPS survey spectrum (a), Bi 4f (b) O1s (c), and C1s (d) of BiMOF/CP. Engineered Science Research PaperEng. Sci., 2018, 3, 77-83 | 79

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