Novel Electrochemical Sensor Based on Integration of Nanoporous Gold with Molecularly Imprinted Polymer for Detection of Arsenic Ion(III)

Authors

Wu-wei MA, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;3. Xinjiang Xiangsheng New Material Technology Co., Ltd. Hami Xinjiang 839000, China;
Qi-gang CHANG, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;
Xiong-fang SHI, 3. Xinjiang Xiangsheng New Material Technology Co., Ltd. Hami Xinjiang 839000, China;
Yan-bin TONG, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;
Li ZHOU, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;
Bang-ce YE, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;2. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China;
Jian-jiang LU, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;
Jin-hu ZHAO, 1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Production and Construction Corps/School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832000, China;

Corresponding Author

Qi-gang CHANG(qgchang@gmail.com)

Abstract

Arsenic, a toxic chemical element, is detrimental to environment and human health in particular. Therefore, the development of simple, fast, and accurate arsenic ion (As³⁺) detection methods has attracted extensive attention. In this work, an electrochemical sensor based on molecular imprinted polymer (MIP) and nano-porous gold (NPG) modified indium tin oxide (ITO) electrode (MIP/NPG/ITO) was developed for determination of As³⁺ in water with different quality. NPG with high conductivity, large specific surface area and high biocompatibility was prepared in situ on ITO surface by a green electrodeposition method using simple and controllable steps. Then, a layer of MIP was synthesized in situ on NPG surface by electropolymerization, in which As³⁺ was used as a template molecule and mphenylenediamine as a functional monomer. The preparation process of MIP/NPG/ITO was monitored by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscope (EDS). The potassium ferricyanide and potassium ferrocyanide chelates were used as electrochemical probes to generate signals. The electrochemical behavior of MIP/NPG/ITO was studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). After optimizing the experimental conditions, As³⁺ was quantitatively detected by cyclic voltammetry. The linear range of As³⁺ was measured from 2.0 ×10^-11 to 9.0×10^-9 mol·L^-1, and the lower detection limit was 7.1×10^-12 mol·L^-1 (S/N = 3). The detection limit of the constructed sensor is far below 10 ppb, which meets the drinking water standards set by the World Health Organization (WHO) and Environmental Protection Agency (EPA). In addition, the sensor has the advantages of simple preparation, simple procedure of determination, good repeatability, excellent reproducibility and stability. It is worth mentioning that the prepared sensor has been successfully applied to the As³⁺ measurements of four water qualities, including landscape river water, groundwater, tap water and domestic sewage. It can be predicted that the reported simple and cheap sensor has potential practical applications in environmental monitoring, food analysis and clinical diagnosis.

Graphical Abstract

Keywords

electrochemical sensor, arsenic, nanoporous gold, molecularly imprinted polymer

DOI Link

https://doi.org/10.13208/j.electrochem.191221

Publication Date

2020-12-28

Online Available Date

2020-06-04

Revised Date

2020-06-03

Received Date

2019-12-21

Recommended Citation

Wu-wei MA, Qi-gang CHANG, Xiong-fang SHI, Yan-bin TONG, Li ZHOU, Bang-ce YE, Jian-jiang LU, Jin-hu ZHAO. Novel Electrochemical Sensor Based on Integration of Nanoporous Gold with Molecularly Imprinted Polymer for Detection of Arsenic Ion(III)[J]. Journal of Electrochemistry, 2020 , 26(6): 900-910.
DOI: 10.13208/j.electrochem.191221
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss6/8

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