Carnation-like Morphology of BiVO4-7 Enables Sensitive Photoelectrochemical Determination of Cr(VI) in the Food and Environment

文献类型： 外文期刊

第一作者： Wu, Wenqin

作者： Wu, Wenqin;Tan, Zhao;Chen, Xiao;Chen, Xiaomei;Cheng, Ling;Li, Peiwu;Zhang, Zhaowei;Wu, Wenqin;Tan, Zhao;Chen, Xiao;Chen, Xiaomei;Cheng, Ling;Li, Peiwu;Zhang, Zhaowei;Tan, Zhao;Chen, Xiao;Wu, Huimin

作者机构：

关键词： photoelectrochemistry; hexavalent chromium; bismuth vanadate; food safety; environmental monitoring

期刊名称：BIOSENSORS-BASEL （ 影响因子：5.743； 五年影响因子：5.972 ）

ISSN：

年卷期： 2022 年 12 卷 2 期

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收录情况： SCI

摘要： Hexavalent chromium, namely, Cr(VI), is a significant threat to ecological and food safety. Current detection methods are not sensitive to Cr(VI). A photoelectrochemical (PEC) sensor based on bismuth vanadate (BiVO4) was developed for sensitive detection of Cr(VI). First, BiVO4-X (X: the pH of the reaction precursor solution) was synthesized using a facile surfactant-free hydrothermal method. The BiVO4-X morphology was well controlled according to pH values, showing rock-like (X = 1), wrinkled bark-like (X = 4), carnation-like (X = 7), and the collapsed sheet-like morphologies (X = 9, 12). BiVO4-7 exhibited excellent photoelectric performance due to a proper band structure under visible light and a large specific surface area. Then, BiVO4-7 was used to construct a PEC sensor to detect Cr(VI), which was demonstrated to have a low detection limit (10 nM) and wide detection range (2-210 mu M). The BiVO4-7 PEC sensor had a stable output signal, as well as excellent reproducibility, repeatability, and selectivity. We used the BiVO4-7 PEC sensor to detect Cr(VI) in real environmental and food samples, resulting in a satisfactory recovery of 90.3-103.0%, as determined by comparison with results obtained using a spectrophotometric method. The BiVO4-7 PEC sensor is promising for practical application to heavy metal detection in the food and environment.

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