Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (11): 20250140.doi: 10.7503/cjcu20250140

• Analytical Chemistry • Previous Articles     Next Articles

Nanosheet FeSe-based Electrochemical Sensor for Rapid Detection of Trace Nitrite Ions in Fracturing Flowback Fluid

ZHANG Xiang1,2, LYU Haiyan1,2, LYU Baoqiang1,2, LYU Xiaoming1,2, LI E3, XU Chunli4(), SU Xiaodong3()   

  1. 1.National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an 710021,China
    2.Research Institute of Oil & Gas Technology,Changqing Oilfield Branch Company,PetroChina,Xi’an 710021,China
    3.College of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China
    4.Central Reserve Grain Nanchong Depository Company Limited,Nanchong 637000,China
  • Received:2025-05-13 Online:2025-11-10 Published:2025-09-05
  • Contact: XU Chunli, SU Xiaodong E-mail:1782512021@qq.com;2008004@cqust.edu.cn
  • Supported by:
    the National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields Development Project, China(CQYT-CQYQY-2023-JS-1247)

Abstract:

A stable CDs/CC superhydrophilic substrate material with uniform anchoring sites was constructed by growing carbon dots(CDs) containing oxygen functional groups on dielectric barrier discharge(DBD)-modified flexible carbon cloth(CC) using a hydrothermal method. The FeSe/CDs/CC nitrite electrochemical sensor was further constructed by growing flaky FeSe nanomaterials on this substrate by a simple and rapid microwave method, and was characterised by X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS) and energy dispersive spectrometer(EDS). The electrochemical performance results showed that the successful modification of CDs and FeSe significantly improved the charge transfer resistance of CC. Under the optimal detection conditions, the oxidation peak current showed a good linear relationship with the nitrite concentration in the ranges of 0.3—10 µmol/L and 10—1000 µmol/L, with the sensitivities of 5477.80 µA∙(mmol/L)∙cm2 and 1828.84 µA∙(mmol/L)∙cm2, and the detection limit of 0.11 µmol/L, respectively. In addition, the sensor possessed excellent immunity to interferences, long-term stability, repeatability and reproducibility, and the recoveries of nitrite spiked in the fracture flowback fluid were in the range of 97.75%—103.12%.

Key words: FeSe/CDs/CC, Nitrite, Electrochemical sensor, Fracture flowback fluid

CLC Number: 

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