1. Noble-metal-free Fe3O4/Co3S4 nanosheets with oxygen vacancies as an efficient electrocatalyst for highly sensitive electrochemical detection of As(III)
- Author
-
Hui-Quan Li, Yu-Min Cui, Hong-Qi Huang, Xing-Jiu Huang, Shi-Hua Chen, Zhonggang Liu, Zheng Guo, and Yong-Yu Li
- Subjects
Inorganic chemistry ,chemistry.chemical_element ,engineering.material ,Electrochemistry ,Electrocatalyst ,Biochemistry ,Analytical Chemistry ,Electrochemical gas sensor ,Nanomaterials ,chemistry ,Electrode ,engineering ,Environmental Chemistry ,Noble metal ,Porosity ,Carbon ,Spectroscopy - Abstract
The electrochemical method for highly sensitive determination of arsenic(III) in real water samples with noble-metal-free nanomaterials is still a difficult but significant task. Here, an electrochemical sensor driven by noble-metal-free layered porous Fe3O4/Co3S4 nanosheets was successfully employed for As(III) analysis, which was prepared via a facile two-step method involves a hydrothermal treatment and a subsequent sulfurization process. As expected, the electrochemical detection of As(III) in 0.1 M HAc-NaAc (pH 6.0) by square wave anodic stripping voltammetry (SWASV) with a considerable sensitivity of 4.359 μA/μg·L−1 was obtained, which is better than the commonly used noble metals modified electrodes. Experimental and characterization results elucidate the enhancement of As(III) electrochemical performance could be attributed to its nano-porous structure, the presence of oxygen vacancies and strong synergetic coupling effects between Fe3O4 and Co3S4 species. Besides, the Fe3O4/Co3S4 modified screen printed carbon electrode (Fe3O4/Co3S4-SPCE) shows remarkable stability and repeatability, valuable anti-interference ability and could be used for detection in real water samples. Consequently, the results confirm that as-prepared porous Fe3O4/Co3S4 nanosheets is identified as a promising modifier to detect As(III) in real sample analysis.
- Published
- 2022
- Full Text
- View/download PDF