☆ 4.7 Article

A novel electrochemical sensor for simultaneous detection of Cd2+ and Pb2+ by MXene aerogel-CuO/carbon cloth flexible electrode based on oxygen vacancy and bismuth film

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

Journal

SCIENCE OF THE TOTAL ENVIRONMENT

Volume 851, Issue -, Pages -

Publisher

ELSEVIER

DOI: 10.1016/j.scitotenv.2022.158325

Keywords

Electrochemical sensor; Synergistic adsorption; Bi (III); Heavy metal ions; Food safety

Funding

National Natural Science Foundation of China [81772290, 81271930]
State Administration for Market Regulation Science and Technology Project [2021MK093]
Chongqing Science and Technology Commission [CSTC2018jcyjAX0062]
Brew Microorganisms Technology and Application of Key Laboratory Project in Sichuan Province [NJ2018-01]
Chongqing Graduate Tutor Team Construction Project, Analytical and Testing Center of Chongqing University

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Abstract

In this study, a novel MXene aerogel-CuO/carbon cloth electrochemical sensor was developed for the detection of Cd2+ and Pb2+ ions in food and water samples. The sensor showed excellent detection performance, with low detection limits and good anti-interference performance. The adsorption mechanism of Cd2+ and Pb2+ onto the electrode surface was investigated, and the synergistic effect of oxygen vacancies and Bi (III) was found to enhance the adsorption capacity of the sensing electrodes.

Herein, a novel MXene aerogel-CuO/carbon cloth (MXA-CuO/CC) electrochemical sensor was constructed, and the synergistic adsorption of heavy metal ions by oxygen vacancies and Bi (III) was investigated with Cd2+ and Pb2+ as detection targets. The oxygen vacancies of CuO have a strong affinity for heavy metal ions, which promoted the adsorption of Cd2+ and Pb2+ on the electrode surface. In addition, the introduced Bi (III) can form alloys with heavy metal ions, which effectively enhanced the adsorption capacity of sensing electrodes for Cd2+ and Pb2+. Differential pulse anodic stripping voltammetry (DPASV) was used to study the performance of MXA-CuO/CC sensitive electrode for the detection of Cd2+ and Pb2+ separately and simultaneously. The constructed sensing electrode has excellent detection performance, and can detect Cd2+ (4 mu g L-1-800 mu g L-1) and Pb2+ (4 mu g L-1-1200 mu g L-1) simultaneously with detection limits of 0.3 mu g L-1 (Cd2+) and 0.2 mu g L-1 (Pb2+), respectively. The proposed sensor electrode also has good anti-interference performance, excellent stability and reproducibility. It is worth mentioning that the proposed method can accurately detect Cd2+ and Pb2+ in food and water samples, which is consistent with the detection results of inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectroscopy (AAS).

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An ultrasensitive electrochemical sensor based on antimonene simultaneously detect multiple heavy metal ions in food samples

Ya Zhang, Ying Xu, Ning Li, Xiaofang Liu, Yi Ma, Huibo Luo, Changjun Hou, Danqun Huo

Summary: Here, we developed a new ultra-sensitive electrochemical sensor based on ZIF-67@antimonene (AMNFs) nanocomposites. The adsorption properties of antimonene on heavy metal ions were studied using first-principles density functional theory. The ZIF-67@AMNFs exhibited excellent adsorption capacity for Cu2+, Pb2+ and Hg2+ and the detection limits were 0.01 pM, 0.042 pM and 0.031 pM, respectively. This sensor has been successfully applied to detect Cu2+, Pb2+ and Hg2+ in various food samples.

FOOD CHEMISTRY (2023)