Cu-Ag/石墨烯修饰电极的制备及其对亚硝酸盐的测定  

Fabrication of a Cu-Ag / graphene modified electrode and its application for determination of nitrite

作　　者：孟祖超[1] 李成希[1] 郭敏[1] 杨义磊 孟昱婷 毛云霞[1] 

机构地区：[1]西安石油大学化学化工学院,西安710065

出　　处：《分析试验室》2016年第5期560-564,共5页Chinese Journal of Analysis Laboratory

基　　金：陕西省自然科学基金项目(2013JQ2015);陕西省教育厅基金项目(2013JK0673);陕西省大学生创新创业训练计划项目(1037)

摘　　要：利用电沉积方法制备Cu-Ag/石墨烯修饰玻碳电极,研究了亚硝酸盐在该修饰电极上的电化学行为,建立了电化学测定亚硝酸盐的新方法。在磷酸盐缓冲溶液中,修饰电极对亚硝酸盐的电化学响应具有很好的催化作用。利用线性扫描伏安法对亚硝酸盐的电化学氧化进行定量分析,亚硝酸盐的氧化峰电流与其浓度在8×10^(-9)~8×10^(-7)mol/L和8×10^(-7)~2×10^(-6)mol/L范围内呈良好的线性关系,检出限低至8×10^(-9)mol/L。A Cu- Ag / grapheme（ GO） modified glassy carbon electrode（ Cu- Ag / GO / GCE） was prepared through electrodepositing Ag- Cu alloy nanoparticles on the GO / GCE and the electrochemical response of nitrite on this modified electrode was investigated. The research results showed that the modified electrode exhibited excellent electrocatalytic behavior toward nitrite. Under the optimal experimental conditions,the oxidation peak current was proportional to the concentration of nitrite in the range from 18 × 10（- 9）- 8 × 10（- 7）mol / L and 8 ×10（- 7）- 2 × 10（- 6）mol / L with the detection limit of 8 × 10（- 9）mol / L. In brief,the Cu- Ag / GO / GCE has the advantage in simple preparation,good reproducibility and high stability,thus,it is suitable for sensitive detection of nitrite.

关 键 词：石墨烯 铜银合金 修饰电极 亚硝酸盐 电化学检测 

分 类 号：O657.1[理学—分析化学]