纳米片FeSe基电化学传感器用于压裂返排液中痕量亚硝酸根的快速检测
张翔 , 吕海燕 , 吕宝强 , 吕小明 , 李娥 , 徐春丽 , 苏小东
高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (11) : 39 -49.
纳米片FeSe基电化学传感器用于压裂返排液中痕量亚硝酸根的快速检测
Nanosheet FeSe-based Electrochemical Sensor for Rapid Detection of Trace Nitrite Ions in Fracturing Flowback Fluid
利用水热法将含氧官能团的碳点(CDs)生长在介质阻挡放电(DBD)改性的柔性碳布(CC)上, 构建了稳定且具有均匀锚定位点的CDs/CC超亲水基底材料. 进一步通过简便快速的微波法在该基底上生长片状的FeSe纳米材料, 构建了FeSe/CDs/CC亚硝酸盐电化学传感器, 并利用X射线衍射(XRD)、 扫描电子显微镜(SEM)、 X射线光电子能谱(XPS)及能量色散光谱(EDS)等手段进行了表征. 电化学性能测试结果表明, CDs和FeSe的 修饰显著提高了CC的电荷转移电阻. 在最佳检测条件下, 氧化峰电流与0.3~10 µmol/L和10~1000 µmol/L 范围内亚硝酸盐浓度呈良好的线性关系, 灵敏度分别为5477.80和1828.84 µA∙(mmol/L)∙cm2, 检出限为 0.11 µmol/L. 此外, 该传感器具有优异的抗干扰能力、 长期稳定性、 重复性和重现性, 对压裂返排液中亚硝酸盐检测的加标回收率在97.75%~103.12%之间.
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%.
硒化铁/碳点/碳布(FeSe/CDs/CC) / 亚硝酸盐 / 电化学传感器 / 压裂返排液
FeSe/CDs/CC / Nitrite / Electrochemical sensor / Fracture flowback fluid
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低渗透油气田勘探开发国家工程实验室开发课题(CQYT-CQYQY-2023-JS-1247)
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