Noble-metal-free Fe3O4/Co3S4 nanosheets with oxygen vacancies as an efficient electrocatalyst for highly sensitive electrochemical detection of As(III)
Noble-metal-free Fe3O4/Co3S4 nanosheets with oxygen vacancies as an efficient electrocatalyst for highly sensitive electrochemical detection of As(III)
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DOI：
10.1016/j.aca.2021.339208
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发表时间：
2021-10-28
影响因子：
6.2
通讯作者：
Huang, Xing-Jiu
中科院分区：
文献类型：
--
作者：
Huang, Hong-Qi;Li, Yong-Yu;Huang, Xing-Jiu
利用不含贵金属的纳米材料高灵敏测定实际水样中砷(III)的电化学方法仍然是一项艰巨但意义重大的任务。在这里，由不含贵金属的层状多孔 Fe3O4/Co3S4 纳米片驱动的电化学传感器成功用于 As(III) 分析，该传感器通过简单的两步法制备，包括水热处理和随后的硫化过程。正如预期的那样，方波阳极溶出伏安法（SWASV）对0.1 M HAc-NaAc（pH 6.0）中的As（III）进行电化学检测，其灵敏度达到4.359 mu A/mu g.L-1，优于常用的贵金属修饰电极。实验和表征结果表明，As(III)电化学性能的增强可归因于其纳米多孔结构、氧空位的存在以及Fe3O4和Co3S4物质之间的强协同耦合效应。此外，Fe3O4/Co3S4修饰丝网印刷碳电极（Fe3O4/Co3S4-SPCE）表现出优异的稳定性和重复性以及有价值的抗干扰能力，可用于实际水样的检测。因此，结果证实所制备的多孔 Fe3O4/Co3S4 纳米片被认为是在实际样品分析中检测 As(III) 的有前景的改性剂。 (C) 2021 Elsevier B.V. 保留所有权利。
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 mu A/mu g.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. (C) 2021 Elsevier B.V. All rights reserved.