Citation: LI Ming, LI Zheng-Ming, DONG Xiao-Tong, JIA Liang-Bin, ZHU Mei-Yan, MA Ye, ZHAO Ming-Gang, CUI Hong-Zhi. Fabrication of Cu/CuO/ZnO/PPy Heterojunction Materials for Anti-interference Detection of Hg²⁺ in Seawater[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(9): 1497-1505. doi: 10.19756/j.issn.0253-3820.211214 shu

Fabrication of Cu/CuO/ZnO/PPy Heterojunction Materials for Anti-interference Detection of Hg²⁺ in Seawater

Department of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

Corresponding author: ZHAO Ming-Gang, zhaomg@ouc.edu.cn
Received Date: 17 March 2021
Revised Date: 4 July 2021

Fund Project: Supported by the Fundamental Research Funds for the Central University of China (Nos.202042009, 201964011) and the National Natural Science Foundation of China (No.52072353).

Hg²⁺ pollutant poses significant risks to human health and the ecological environment. However, the direct and sensitive detection technique for Hg²⁺ has been lacking at the present time. In this study, Cu/CuO/ZnO wire was fabricated by alkaline oxidation method and hydrothermal method, and PPy was covered on the material surface by electrochemical polymerization method. Based on the principle that the p-n junction barrier drives the electrochemical signal response, the material was used for direct electrochemical detection of Hg²⁺ and differential pulse voltammetry was performed. The prepared composite was successfully used for detection of Hg²⁺ in the concentration range from 200 nmol/L to 1600 nmol/L, with a ultra-high sensitivity (1010.82 μA·L/(nmol·cm²)) and a ultra-low detection limit (2.1 pmol/L). The novel sensing mode based on the interface barrier eliminated the interference of other ions and achieved good recoveries (97.3%-105.0%) in tap water, river water and sea water, with RSD of 1.8%-5.6%. This approach could be extended to develop new sensors for other heavy metals by employing p-n junction barrier.
- p-n Junction,
- Mercury,
- Interfacial barrier,
- Electrochemical detection,
- Metal wire
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沈阳化工大学材料科学与工程学院沈阳 110142

Fabrication of Cu/CuO/ZnO/PPy Heterojunction Materials for Anti-interference Detection of Hg2+ in Seawater

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通讯作者: 陈斌, bchen63@163.com

Fabrication of Cu/CuO/ZnO/PPy Heterojunction Materials for Anti-interference Detection of Hg²⁺ in Seawater