基于Bi@BiOCl/MWNTs的光电化学传感器超灵敏地检测对乙酰氨基酚

Multiwalled Carbon Nanotubes/Bi@BiOCl Modified Electrode for Ultra-Sensitive Detection of Acetaminophen

目的:本研究通过水热法合成了均匀的Bi@BiOCl微球,结合多壁碳纳米管(MWNTs),制备了Bi@BiOCl/ MWNTs材料,将其应用于对乙酰氨基酚(AC)的特异性光电化学检测。Bi@BiOCl/MWNTs/GCE检测AC时有显著的光电流响应,这主要是由于在可见光照下,Bi与BiOCl产生光生电子(e−)空穴(h+)对,可以吸附更多的AC至电极表面并氧化,增加的光电流;而MWNTs具有较强的导电能力,传导光生电子以及AC被氧化产生的电子,阻止电子空穴对的复合,吸附更多的AC,进一步提高光电流,最终实现对AC的超灵敏性检测。该光电传感器检测AC时的浓度范围在0.5~300 μmol/L之间,检出限为0.17 μmol/L,表明Bi@BiOCl/MWNTs对AC具有较好的催化效果。该光电化学传感器具有特异性强、稳定性好和灵敏度高等优点,且对生物分子中酚类化合物的检测具有潜在的意义,期待其在生物传感器的开发中具有广阔的应用前景。

Purpose: In this study, homogeneous Bi@BiOCl microspheres were synthesized by hydrothermal method and combined with multiwalled carbon nanotubes (MWNTs) to prepare Bi@BiOCl/MWNTs electrode, which was applied to the specific photochemical detection of acetaminophen (AC). Bi@BiOCl/MWNTs/GCE has a significant photocurrent response for detection of acetaminophen, which is mainly due to the photogenerated electron (e−) hole (h+) pair generated by Bi and BiOCl under visible light, which can adsorb more AC to the electrode surface and oxidize AC, increasing the photocurrent. MWNTs has strong electrical conductivity, conducts photogenerated electrons and electrons which AC was oxidized, prevents the recombination of electron hole pairs, absorbs more AC, further improves the photocurrent, and finally realizes the ultra-sensitive detection of AC. The concentration range of the photochemical sensor for AC detection was between 0.5 μmol/L and 300 μmol/L, the detection limit was 0.17 μmol/L, indicating that Bi@BiOCl/MWNTs had a good catalytic effect on AC. The photochemical sensor has strong specificity, good stability and high sensitivity and potential significance for the detection of phenolic compounds in biomolecules. It is expected to have a broad application prospect in the development of biosensors.