负载爆米花状铜粒子的植酸掺杂碳纳米管网络用于Hg(Ⅱ)的高灵敏检测

Highly Sensitive Determination of Hg(II)Based on Phytic Acid Doped Carbon Nanotube Network Loaded with Popcorn Copper

Hg(Ⅱ)易于在生物体内积累,对人类健康和生态环境构成严重威胁,实现Hg(Ⅱ)的灵敏、快速且准确的检测至关重要。以逐步电沉积的方式,先后在丝网印刷碳电极表面修饰植酸掺杂的碳纳米管网络(PACNTnet)和爆米花状铜粒子(popCu),以构建Hg(Ⅱ)电化学传感器。含有丰富含氧官能团和磷酸根的PACNTnet为Hg(Ⅱ)提供了大量的结合位点,而适量Cu(Ⅱ)与Hg(Ⅱ)之间的协同作用实现了电流信号的放大。因此,所制备的电化学传感器对于Hg(Ⅱ)的检测表现出良好的选择性、重现性和稳定性,在Hg(Ⅱ)质量浓度为0.02~2μg/L的线性范围内,传感器灵敏度高达5.51μA/(μg·L^(-1)),检测限低至0.012μg/L。此外,大米和茶叶样品的加标回收实验也获得了良好的回收率,证明了该传感器在实际样品中的应用潜力。

Hg(Ⅱ)accumulation in organisms can cause serious threats to human health and ecology.Therefore,it is crucial to sensitively,rapidly,and accurately detect Hg(Ⅱ)under different conditions.To construct an effective electrochemical sensor for Hg(II),phytic acid doped carbon nanotube network(PACNTnet)and popcorn-like copper nanoparticles(popCu)were electrodeposited on the surface of screen-printed carbon electrodes(SPCE)through cyclic voltammetry and the potentiostatic method.A large number of binding sites for Hg(Ⅱ)were generated on PACNTnet with oxygen-containing functional groups and phosphates being predominant.The sensing signal was amplified by the synergistic effect of Cu(Ⅱ)and Hg(Ⅱ).A sensitivity of 5.51μA/(μg·L^(-1))was achieved with a linear range of 0.02-2μg/L,and a detection limit of 0.012μg/L was determined.Furthermore,a satisfactory recovery rate of Hg(II)was obtained in rice and tea samples.Using ICP-MS as a reference method,the accuracy of the as-fabricated sensor was corroborated.The results indicated the potential of popCu/PACNTnet/SPCE for Hg(II)detection in real-world samples.