基于WO<sub>3</sub>/AuNPs/FTO的光电化学法检测自来水中的钴离子

引用本文: 郑晨琰, 李百川, 陈晓梅, 陈曦. 基于WO₃/AuNPs/FTO的光电化学法检测自来水中的钴离子[J]. 分析化学, 2020, 48(3): 371-377. doi: 10.19756/j.issn.0253-3820.191658 shu

Citation: ZHENG Chen-Yan, LI Bai-Chuan, CHEN Xiao-Mei, CHEN Xi. Photoelectrochemical Detection of Cobalt Ion Based on WO₃/AuNPs/FTO Electrode[J]. Chinese Journal of Analytical Chemistry, 2020, 48(3): 371-377. doi: 10.19756/j.issn.0253-3820.191658 shu

基于WO₃/AuNPs/FTO的光电化学法检测自来水中的钴离子

1.
集美大学食品与生物工程学院, 厦门 361021;
2.
厦门大学化学化工学院, 厦门 361005
基金项目:
本文系国家自然科学基金项目（No.21675062）和福建省自然科学基金项目（No.2017J05053）资助

摘要: 建立了一种快速检测钴离子（Co²⁺）的光电化学方法。首先在掺氟的SnO₂透明导电玻璃（FTO）表面电沉积金纳米颗粒（AuNPs），再通过水热法在AuNPs/FTO表面生长WO₃，得到WO₃/AuNPs/FTO。通过扫描电镜和X射线衍射对WO₃/AuNPs/FTO电极的表面形貌和晶格特征进行了表征。结果表明，AuNPs均匀分布在FTO表面，WO₃呈垂直板状阵列生长。当体系中含有一定量的乙醇和Co²⁺时，由于Co²⁺与乙醇的醇羟基的配位作用，抑制了乙醇捕获光生空穴的能力，对WO₃/AuNPs/FTO的光电流产生明显抑制作用。在优化的条件下，光电流降低程度与Co²⁺浓度在0.5~7.0 μmol/L范围内呈线性关系，检出限为0.3 μmol/L（3s/k）。将本方法用于自来水中Co²⁺含量测定，回收率为98.3%~110.0%；用于维生素B12中Co²⁺含量的检测，测定值与国标法的结果接近，说明本方法具有较高的准确度，可望应用于实际样品中Co²⁺含量检测。

关键词:

English

Photoelectrochemical Detection of Cobalt Ion Based on WO₃/AuNPs/FTO Electrode

1.
College of Food and Biological Engineering, Jimei University, Xiamen 361021, China;
2.
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
Received Date: 08 November 2019
Revised Date: 10 December 2019
Fund Project:
This work was supported by the National Natural Science Foundation of China (No. 21675062), and the Science and Technology Planning Project of Fujian Province, China (No. 2017J05053).

Abstract: A photoelectrochemical (PEC) method was constructed for detection of Co²⁺ based on a WO₃/AuNPs/FTO electrode. Gold nanoparticles (AuNPs) were electrochemically deposited on the surface of FTO and then tungsten trioxide (WO₃) with vertically aligned plate-like structure was hydrothermally grown on the surface of AuNPs/FTO. The WO₃/AuNPs/FTO was characterized by scanning electron microscopy and X-ray diffraction (XRD) patterns. From the PEC results, Co²⁺ had a weak inhibition effect on the photocurrent of WO₃/AuNPs/FTO. After addition of ethanol, the photocurrent decreased obviously. On this basis, a sensitive PEC platform was constructed for monitoring Co²⁺ in the range of 0.5-7.0 μmol/L with a detection limit of 0.3 μmol/L. The recovery was from 98.3% to 110.0%, indicating that this method had good accuracy and was expected to be applied to the detection of Co²⁺ in real samples.

Key words:

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基于WO3/AuNPs/FTO的光电化学法检测自来水中的钴离子

English

Photoelectrochemical Detection of Cobalt Ion Based on WO3/AuNPs/FTO Electrode

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通讯作者: 陈斌, bchen63@163.com

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基于WO₃/AuNPs/FTO的光电化学法检测自来水中的钴离子

Photoelectrochemical Detection of Cobalt Ion Based on WO₃/AuNPs/FTO Electrode