Highly sensitive electrochemical detection of carbendazim residues in water by synergistic enhancement of nitrogen-doped carbon nanohorns and polyethyleneimine modified carbon nanotubes

作者：Chen, Xingguang; Li, Wenzhe; Lu, Chaoqun; Chu, Jiyang; Lin, Rui; Wang, Peixuan; Xie, Guangfa; Gu, Qianhui^*; Wu, Dianhui^*; Chu, Beibei^*

来源：Science of the Total Environment, 2022, 851: 158324.

DOI：10.1016/j.scitotenv.2022.158324

• Carbendazim
• Electrochemical sensor
• Nitrogen -doped carbon nanohorns
• Polyethyleneimine modi fied carbon nanotubes

Carbendazim (CBZ) can protect crops from pathogens, but it is also easy to cause pesticide residues, threatening human health. In our work, an electrochemical sensor based on nitrogen-doped carbon nanohorns (N-CNHs) and polyethyleneimine-modified carbon nanotubes (PEI-CNTs) was developed for the detection of CBZ content in water. The results showed that N-doping provided the C\\N bonds for CNHs and improved the electrochemical reaction perfor-mance of N-CNHs surface. With the participation of PEI, the surface of CNTs was positively charged and contained a large number of N\\H bonds, which not only promoted the electrostatic assembly of N-CNHs and PEI-CNTs but also was ben-eficial to further enriching CBZ. After further ultrasound-assisted assembly of N-CNHs and PEI-CNTs, the electron transfer capacity, electrochemical active surface area, and catalytic activity of N-CNHs/PEI-CNTs were significantly improved. The sensor performed a wider linear range (15 nmol/L -70 mu mol/L), low detection limit (4 nmol/L) and satisfactory recovery (87.33 %-117.67 %) under the optimal conditions. In addition, the sensor had good anti-interference, reproducibility, and stability. Our work provided a new strategy for quantification of CBZ in environment.

• 单位
  江南大学; 西南大学