光电流
材料科学
石墨氮化碳
异质结
光电子学
氮化碳
可见光谱
化学
光催化
生物化学
催化作用
作者
Qian Liu,Peilin Yang,Kaituo Jiang,Hang Zhang,Tianyan You
标识
DOI:10.1016/j.microc.2023.109015
摘要
The development of a reliable method for detecting tetracycline (TC) in fish is essential to ensure the safety of aquatic products and human health. Herein, a photoelectrochemical (PEC) aptasensor was fabricated for the efficient detection of TC based on a designed efficient photoanode with a novel high light-harvesting heterojunction of bismuth sulfide/graphitic carbon nitride (Bi2S3/g-C3N4) as a photoactive material. The Bi2S3/g-C3N4 exhibited enhanced photocurrent due to its increased light capture capability, high carrier density and especially low electron-hole recombination efficiency enabled by the Z-scheme electron transfer, which was verified by the UV–vis diffuse reflectance spectrum, Mott–Schottky plot, and electron spin resonance spectroscopy. Under optimal experimental conditions, the fabricated aptasensor had the advantages of a wide linear range of 0.01–10 nM, a low detection limit of 3 pM and good selectivity and reproducibility. When the aptasensor was applied to determine TC in fish, the results were in good agreement with the UPLC-MS/MS method, indicating the reliability of the PEC aptasensing method for detecting TC in real samples.
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