石墨烯-纳米银修饰电极检测过氧化氢

The Electrochemical Detection of H2O2 by Silver Nanoparticles-Reduced Graphene Modified Electrode

摘要:

通过以氧化石墨烯（GO）和硝酸银为原料，通过共合成法，制备得到了还原氧化石墨烯负载纳米银颗粒（AgNPs-rGO），并将AgNPs-rGO复合物修饰在碳糊电极（CPE）上，制得AgNPs-rGO/CPE电极。通过XRD、SEM和EDS等技术对AgNPs-rGO的结构进行了表征与测试。结果表明，AgNPs很好的负载在了rGO上，且银元素的质量分数高达50.57%。当硝酸银用量为0.02 mol/L时，AgNPs-rGO/CPE电极表现出最佳的电化学性能。在pH=5.5的磷酸缓冲溶液中，对过氧化氢在石墨烯负载纳米银颗粒修饰碳糊电极（AgNPs-rGO/CPE）上的电化学行为进行研究。结果表明AgNPs-rGO/CPE对过氧化氢的电化学检测，表现出良好的稳定性，相对标准偏差仅为3.7%。当过氧化氢的浓度在1.0×10-8 -1.0×10-6 mol/L的线性范围内时，过氧化氢的响应电流值与其浓度呈现了良好的线性关系，线性相关系数R2高达0.9934。将其应用于自来水样品中的过氧化氢检测，得到的加标回收率达到97.1%，多次重复检测的相对标准偏差仅为4.7%。实验结果表明所制备的AgNPs-rGO/CPE工作电极对过氧化氢的电化学分析检测方法，具有良好的重现性和稳定性，可应用于过氧化氢的分析检测。

Abstract:

Silver nanoparticles-reduced graphene oxide composite (AgNPs-rGO) was prepared by co-synthesized and used for preparation of carbon paste electrode (CPE). AgNPs-rGO was characterized by XRD, SEM and EDS. The results indicated AgNPs-rGO was well synthesized with the 50.57% content of Ag element. The electrochemical behavior of H2O2 at AgNPs-rGO/CPE was investigated in pH=5.5 phosphate buffer solution. AgNPs-rGO/CPE exhibited significant response enhancement for the electrochemical determination of hydrogen peroxide (H2O2) while the RSD was 3.7%. In the range of 1.0×10-8 -1.0×10-6 mol/L, the electrochemical current of H2O2 increased linearly with the concentration of H2O2 (R2=0.9934). For that, the method was further applied in the detection of H2O2 in drinking water. The recovery rate and RSD in drinking water sample were found to be 97.1% and 4.7%, respectively. The results showed that the AgNPs-rGO/CPE working electrode could be used for electrochemical detection of H2O2 with good reproducibility and stability.