基于Fe3O4/GCE磁性传感器检测水中苯酚

Detection of phenol in water based on Fe3O4/GCE magnetic sensor

中文关键词:  Fe3O4磁性纳米材料  传感器  苯酚

英文关键词:Fe3O4 magnetic nanomaterials  sensor  phenol

中文摘要:

      目的 构建定量检测水中苯酚含量的Fe3O4/GCE磁性传感器。方法 以玻碳电极(glassy carbon electrode, GCE)为工作电极, 以Fe3O4磁性纳米材料为修饰材料, 制备Fe3O4/GCE磁性传感器, 通过对电解质种类、浓度以及修饰材料修饰量的选择, 确定Fe3O4/GCE磁性传感器对苯酚进行定量分析的最佳检测条件。结果 Fe3O4具有良好的导电性、吸附性以及电催化活性, 能够有效地提高传感器的灵敏度。Fe3O4/GCE检测苯酚的最佳条件为: Fe3O4修饰量5 μL (1 mg/mL), 电解质H2SO4浓度为1.0 mol/L。在最佳检测条件下, 苯酚在2~270 μg/L范围内与其氧化峰电流呈良好的线性关系, 线性方程为Y=0.4544X?0.921, r2=0.9976, 检出限为 1.084 μg/L (S/N=3), 加标回收率在95.84%~99.67%之间, 相对标准偏差(the relative standard deviations, RSDs)不大于3.42%, 连续扫描8次的RSDs为2.58%, 6支传感器6次扫描的RSD为2.89%, 保存35 d后, 其对 50 μg/L的苯酚的测试效果仍可达到最初的91.21%。结论 该Fe3O4/GCE磁性传感器制备简单快捷、成本低、检测准确度高, 重复性、重现性和稳定性较好, 适用于水中苯酚的现场快速检测分析。

英文摘要:

      Objective To construct a Fe3O4/GCE magnetic sensor for the quantitative determination of phenol in water. Methods Fe3O4/GCE magnetic sensor was prepared using glassy carbon electrode (GCE) as working electrode, and Fe3O4 magnetic nanomaterials as modified materials, the optimum detection conditions of Fe3O4/GCE were determined by optimizing the type and concentration of electrolyte and the modification amount of modified materials. Results Fe3O4 had good conductivity, adsorption and electrocatalytic activity, which could effectively improve the sensitivity of the sensor. The optimum conditions for the determination of phenol were as follows: Fe3O4/GCE modification amount was 5 μL (1 mg/mL), electrolyte H2SO4 concentration was 1.0 mol/L. Under the best detection conditions, there was a good linear relationship between phenol concentration and oxidation peak current in the range of 2?270 μg/L, the linear equation was Y=0.4544X?0.921, r2=0.9976, the limit of detection was 1.084 μg/L (S/N=3), the recoveries were 95.84%?99.67%, the relative standard deviations (were less than or equal to 3.42%, the RSD of 8 consecutive scans was 2.58%, and the RSD of 6 sensors with 6 scans was 2.89%, after 35 days, the test effect could still reach the original 91.21%. Conclusion The Fe3O4/GCE magnetic sensor is simple and quick to prepare with low cost, high accuracy, good repeatability, good reproducibility and good stability, which is suitable for the rapid detection and analysis of phenol in water.