基于纳米复合材料的电化学传感器检测水中的Cd(Ⅱ)

Detection of Cd(Ⅱ) in Water by Electrochemical Sensor Based on Nano-Composite Materials

目的:重金属具有高毒性、不易降解等危险,因此需建立准确、灵敏的相关检测手段。方法:通过绿色化学原位还原法合成GO/BiNPs材料,在此基础上采用柠檬酸还原法合成AuNPs,即为GO/BiNPs/AuNPs纳米复合材料。结果:在最优条件下,采用SWV方波伏安法对不同浓度的Cd(Ⅱ)进行检测,结果表明该传感器在5 nmol/L~1 μmol/L,线性关系良好,检测限为2.30 nmol/L。结论:该修饰电极在Cd(Ⅱ)检测的应用中具有一定的抗干扰性、良好的重现性,同时具有实际应用能力。

Objective:Heavy metals are highly toxic and not easy to degrade,so it is urgent to establish accurate and sensitive detection methods.Method:GO/BiNPs material was synthesized by green chemical in-situ reduction method,and then AuNPs was synthesized by citric acid reduction method on the basis of this material,namely GO/BiNPs/AuNPs nanocomposites.Result:Under the optimal conditions,SWV method was used to detect Cd(Ⅱ) at different concentrations.The results showed that the linearity of the sensor was good in the range of 5 nmol/L~1 μmol/L,and the detection limit was 2.30 nmol/L.Conclusion:The experimental results show that the modified electrode has certain anti-interference,good reproducibility and practical application ability in Cd(Ⅱ) detection.