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NO-2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NO-2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NO-2,NO-2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NO-2的定量测定,加标回收率为96.7%—106.7%,结果令人满意.
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(NO-2)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 NO-2,and the catalytical mechanism was involved two electrons in irreversible reaction.The low concentration of NO-2 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 NO-2 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.
作者
李致霆
张雨琪
邹晨
黄金烨
史书宽
李爱莉
许贺
LI Zhiting;ZHANG Yuqi;ZOU Chen;HUANG Jinye;SHI Shukuan;LI Aili;XU He(College of Environmental Science and Engineering,Donghua University,Shanghai,201620,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第7期1904-1912,共9页
Environmental Chemistry
基金
中央高校科研业务费专项基金(17D111310)资助
关键词
银纳米粒子
聚萘二胺
亚硝酸盐
电催化氧化
silver nanoparticles
poly(naphthalenediamine)
nitrite
electrocatalytical oxidation
