八面体二氧化铈负载金纳米粒子的电化学传感器检测邻氨基苯酚

An electrochemical sensor based on the octahedral cerium dioxide-loaded gold nanoparticles for the detection of o-aminophenol

采用原位生长法制备了八面体二氧化铈(Ce O_(2))负载金纳米粒子(Au NPs)复合材料Au NPs@Ce O_(2),用扫描电镜及能量色散X射线光谱仪对复合材料进行形貌表征与元素分析。利用此复合材料修饰玻碳电极,构筑了一种邻氨基苯酚电化学传感器。Ce O_(2)性质稳定,其八面体结构提供了较大的比表面积,Au NPs具备极佳的导电性,二者复合协同发挥良好的电催化能力。研究发现,Au NPs@Ce O_(2)复合材料修饰电极对邻氨基苯酚表现出较高的检测灵敏度,在优化实验条件下,邻氨基苯酚浓度与氧化峰电流成正比,在1.00×10^(-7)~3.38×10^(-5)mol/L浓度范围内呈现2段较好的线性关系,线性回归方程分别为I_(1)(A)=3.29×10^(-2)c(mol/L)+1.08×10^(-8)(R=0.9967)和I_(2)(A)=1.32×10^(-2)c(mol/L)+1.22×10^(-7)(R=0.9956),检出限(LOD)为1.16×10^(-8)mol/L。该电化学传感器用于实际样品中邻氨基苯酚的测定,回收率为98.0%~105.3%,相对标准偏差为0.9%~3.1%。

The composite of octahedral cerium dioxide-loaded gold nanoparticles(Au NPs@CeO_2) was prepared by the in-situ growth method.The morphology and elemental analysis of the composite were characterized by scanning electron microscope and energy dispersion X-ray spectrometer.An o-amino phenol electrochemical sensor was constructed by using the composite modified glass carbon electrode.The octahedral cerium dioxide(CeO_2) has the advantages of stable chemical property and a large specific surface area.It has excellent electrocatalytic performance in combination with gold nanoparticles(Au NPs).It was found that Au NPs@CeO_(2modified) electrode showed high detection sensitivity to o-aminophenol.Under the optimal experimental conditions,the concentration of o-aminophenol was proportional to the oxidation peak current,and there were two good linear relationships between the concentration of o-aminophenol and the oxidation peak current in the range of 1.00×10^(-7)-3.38×10^(-5) mol/L.The linear regression equations were I_1(A)=3.29×10^(-2)c(mol/L)+1.08×10^(-8)(R=0.9967) and I_2(A)=1.32×10^(-2)c(mol/L)+1.22×10^(-7)(R=0.9956),respectively.The detection limit(LOD) was 1.16×10-8 mol/L.The electrochemical sensor could be used for rapid detection of o-aminophenol in real samples,the recoveries of o-aminophenol were 98.0%-105.3%,and the relative standard deviations were 0.9%-3.1%.