Leaf-Like ZIF-Derived Zinc-Cobalt Layered Double Hydroxide@Cerium Dioxide Nanosphere Heterostructure/Nickel Foam Composite Electrode for the Detection of Lead Ions in the Environment

Author:

Jiang Cheng,Luo Zihan,Peng Xuhong,Fang Jian,Zhao JihuaORCID

Abstract

The lead (Pb) in the environment is harmful to human body, so it is of practical significance and application value to develop a method for detecting lead ions (Pb2+) in the environment. Herein, Zeolitic imidazolate framework/nickel foam (ZnCo ZIF-L/NF) was in situ grown on nickel foam (NF) substrate by hydrothermal method, and aged and hydrolyzed at room temperature to transform ZnCo ZIF-L into zinc cobalt layered double hydroxide/nickel foam (ZnCo ZLDH/NF). CeO2 nanospheres were synthesized and loaded onto ZnCo ZLDH/NF materials to prepare ZnCo ZLDH@CeO2/NF heterostructure composite electrodes. Finally, ZnCo ZLDH@CeO2/NF was used to detect divalent lead ion (Pb2+) by differential pulse anodic stripping voltammetry (DPASV). The electrochemical sensor constructed by the ZnCo ZLDH@CeO2/NF composite electrode exhibits the concentration linear range of 0.1 μM–30 μM with a limit of detection 9 nM (S/N = 3) and the sensitivity of 67 A/M. Meanwhile, the ZnCo ZLDH@CeO2/NF composite electrode has good repeatability and anti-interference stability.

Funder

National Natural Science Foundation of China

Publisher

The Electrochemical Society

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