基于二氧化钛@金/羧甲基壳聚糖/玻碳电极传感器同时检测饮用水中重金属铅和镉的研究

Simultaneous detection of heavy metals lead and cadmium in drinking water based on titanium dioxide@gold nanoparticles/carboxymethyl chitosan/glassy carbon electrode sensor

中文关键词:  二氧化钛  复合纳米材料  铅  镉  传感器

英文关键词:titanium dioxide  nanoparticles nanocomposite  lead  cadmium  sensor

中文摘要:

      目的 制备二氧化钛@金/羧甲基壳聚糖/玻碳电极(titanium dioxide@gold nanoparticles/carboxymethyl chitosan/glassy carbon electrode, TiO2@Au/CMCS/GCE)传感器对饮用水中的铅和镉同时进行检测分析。方法 制备了二氧化钛纳米材料(titanium dioxide nanomaterials, TiO2)并在此基础上负载纳米金(gold nanoparticles, Au), 制备了新型的二氧化钛@纳米金纳米复合材料(titanium dioxide@gold nanoparticles, TiO2@Au)。以玻碳电极(glassy carbon electrode, GCE)为工作电极, 羧甲基壳聚糖(carboxymethyl chitosan, CMCS)为交联剂, 制备了TiO2@Au/CMCS/GCE传感器。结果 TiO2@Au具有良好的导电性, 对Cd2+和Pb2+具有很好的富集作用, 能够有效提高TiO2@Au/CMCS/GCE的灵敏度; CMCS对TiO2@Au起到了很好的交联作用, 并能为传感器提供稳定的电化学环境。Cd2+和Pb2+浓度与它们的峰电流分别在0.05~6.00和0.01~8.00 μmol/L范围内呈线性关系, 检出限(S/N=3)分别为0.0242和0.0051 μmol/L; 加标回收率分别在92.30%~96.74%和93.20%~97.06%之间。TiO2@Au/CMCS/GCE对常见重金属Ca2+、Mg2+、Fe3+和Ni+有很好的抗干扰能力并且重复性、稳定性良好。结论 TiO2@Au/CMCS/GCE传感器简单快捷, 可用于饮用水中铅和镉的同时定量分析。

英文摘要:

      Objective To prepare titanium dioxide@gold nanoparticles/carboxymethyl chitosan/glassy carbon electrode (TiO2@Au/CMCS/GCE) sensor for simultaneous detection and analysis of lead and cadmium in drinking water. Methods Titanium dioxide nanomaterials (TiO2) were prepared and supported with gold nanoparticles (Au) and a new type of titanium dioxide@gold nanoparticles (TiO2@Au) was prepared. TiO2@Au/CMCS/GCE sensor was prepared using glassy carbon electrode (GCE) as the working electrode and carboxymethyl chitosan (CMCS) as the crosslinking agent. Results TiO2@Au had good conductivity and enrichment effect on Cd2+ and Pb2+, which could effectively improve the sensitivity of TiO2@Au/CMCS/GCE; CMCS could crosslink TiO2@Au well and provide a stable electrochemical environment for the sensor. The concentrations of Cd2+ and Pb2+ were linear with their peak currents in the range of 0.05-6.00 and 0.01-8.00 μmol/L, respectively, the detection limits (S/N=3) were 0.0242 and 0.0051 μmol/L, respectively; the recoveries of spiked samples were 92.30%-96.74% and 93.20%-97.06%. TiO2@Au/CMCS/GCE had good anti-interference ability against common heavy metals Ca2+, Mg2+, Fe3+ and Ni+ and good repeatability and stability. Conclusion TiO2@Au/CMCS/GCE sensor is simple and rapid, which can be used for simultaneous quantitative analysis of lead and cadmium in drinking water.