AgNPs/聚萘二胺/碳纳米管复合电极对亚硝酸盐的电化学检测
Electrochemical detection of nitrite based on silver nanoparticles/poly (naphthalenediamine)/carbon nanotubes composites electrode
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摘要: 本文采用简单、环保的电化学沉积法制备银纳米粒子/聚萘二胺/碳纳米管修饰玻碳电极（AgNPs/Poly（1，5-DAN）/CNTs/GCE），并将其应用于亚硝酸盐的定量检测.通过扫描电子显微镜（SEM）、能量散射光谱（EDX）和电化学技术对AgNPs/Poly（1，5-DAN）CNTs/GCE的形貌和性能进行表征，研究该修饰电极快速检测NO2-离子的电化学行为和电催化机理.结果表明，由于银纳米粒子、聚萘二胺和碳纳米管复合物的协同作用，AgNPs/Poly（1，5-DAN）CNTs/GCE复合电极的电活性面积和催化性能明显提高.该修饰电极对NO2-的检测具有优异的电化学行为，催化机理是2个电子参与的不可逆反应.采用安培法检测低浓度NO2-，NO2-氧化电流随其浓度的增加而增加，且在1.5×10-7-6.75×10-5 mol·L-1（I（μA）=0.0667 C+0.1049，R2=0.9918）范围内呈现良好的线性关系，检出限低至5×10-8 mol·L-1（S/N=3）.该AgNPs/Poly（1，5-DAN）CNTs/GCE还具有良好的选择性、稳定性和再现性，成功应用于实际样品中NO2-的定量测定，加标回收率为96.7%-106.7%，结果令人满意.Abstract: In this paper, the silver nanoparticles/poly(naphthalenediamine)/carbon nanotubes modified glassy carbon electrode (AgNPs/Poly(1,5-DAN)/CNTs/GCE) was prepared by a simple and environmental-friendly electrodeposition method, which was applied to quantitatively detect the nitrite (NO2-) salts. The morphology and properties of AgNPs/Poly(1,5-DAN)/CNTs/GCE were characterized by scan electron microscope (SEM), energy dispersive X-ray spectrum (EDX) and electrochemical techniques. The electrochemical behavior and electrocatalytical mechanism of nitrite detection were also examined. The results displayed that the electroactive area and catalytical properties of AgNPs/Poly(1,5-DAN)/CNTs/GCE were significantly improved, mainly due to the synergistic effects of AgNPs, poly(1,5-DAN) and CNTs. The proposed electrode had excellent electrochemical behaviors for the determination of NO2-, and the catalytical mechanism was involved two electrons in irreversible reaction. The low concentration of NO2- was detected by amperometry, and the oxidation peak currents of nitrite were increased with the increasement of its concentration. The good linearity of peak currents versus NO2- concentration was obtained in the range of 1.5×10-7-6.75×10-5 mol ·L-1 (I (μA)=0.0667 C+ 0.1049, R2=0.9918), and the limit of detection (LOD) was as low as 5×10-8 mol ·L-1(S/N=3). The AgNPs/Poly(1,5-DAN)/CNTs/GCE had good selectivity, long-term stability and reproductivity, which was successfully applied to detect nitrite in real water samples. The recovery rates of standard addition were ranging from 96.7% to 106.7% with satisfactory results.
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Key words:
- silver nanoparticles /
- poly(naphthalenediamine) /
- nitrite /
- electrocatalytical oxidation
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