【摘要】 制备了金纳米粒子/碳纳米管修饰玻碳电极(AuNPs-CNTs/GCE),采用循环伏安法和线性扫描伏安法研究了4-壬基酚在修饰电极上的电化学行为,并建立了一种灵敏简便地检测4-壬基酚的电化学方法。优化了pH值、扫描速率、富集时间等测定参数,并计算出pH值与氧化峰电压、扫描速率与氧化峰电流之间的数量关系。在pH 10.0的BR缓冲溶液中,4-壬基酚在AuNPs-CNTs/GCE上出现灵敏的氧化峰,氧化电位为0.51 V。与裸玻碳电极(GCE)和单一碳纳米管修饰电极(CNTs/GCE)相比,AuNPs-CNTs/GCE明显提高了4-壬基酚的氧化电流。在优化实验条件下,4-壬基酚的浓度分别在0.05～4μmol/L和6～14μmol/L范围内与氧化峰电流呈良好的线性关系,检出限为0.023μmol/L,对于实际样品测定的回收率为95%～104%。该修饰电极具有良好的重现性和稳定性,可用于环境样品中4-壬基酚的直接检测。更多还原

【Abstract】 A gold nanoparticles/multi-walled carbon nanotubes modified glassy carbon electrode(AuNPs-CNTs/GCE) was prepared,and the electrochemical behavior of 4-n-octylphenol(NP) on the modified electrode was investigated by cyclic voltammetry(CV) and linear sweep voltammetric(LSV) method.In BR buffer solution,a sensitive oxidation peak of NP was found at+0.51 V and the oxidation peak current was significantly enhanced by AuNPs-CNTs/GCE compared with those by bare glassy carbon electrode(GCE) and multi-walled carbon nanotubes modified glassy carbon electrode(CNTs/GCE).Based on this,a simple and sensitive electroanalytical method was developed for the determination of NP.Factors such as pH,scan rate and accumulation time that influenced the detection processes were optimized.Under the optimal conditions,the oxidation peak current was proportional to NP concentration in wide linear ranges of 0.05-4 μmol/L and 6-14 μmol/L with correlation coefficients of 0.998 4 and 0.993 3,respectively.The low detection limit was 0.023 μmol/L.The spiked recoveries of the samples were in the range of 95%-104%.With the advantages of simple preparation,high sensitivity,low cost,excellent reproducibility and stability,the proposed method could be used in the determination of NP in environmental sample.更多还原