Electrochemical sensor construction based on Nafion/calcium lignosulphonate functionalized porous graphene nanocomposite and its application for simultaneous detection of trace Pb2+ and Cd2+
Electrochemical sensor construction based on Nafion/calcium lignosulphonate functionalized porous graphene nanocomposite and its application for simultaneous detection of trace Pb2+ and Cd2+
复制标题
基于Nafion/木质素磺酸钙功能化多孔石墨烯纳米复合材料的电化学传感器构建及其在痕量Pb2和Cd2同时检测中的应用
DOI：
10.1016/j.snb.2017.12.103
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发表时间：
2018-04
期刊：
影响因子：
--
通讯作者：
X. Hu
中科院分区：
文献类型：
--
作者：
L. Yu;Q. Zhang;B. Yang;Q. Xu;Q. Xu;X. Hu
采用木质素磺酸钙（CLS）辅助氧化石墨的化学还原和热还原反应制备了一种新型的多孔石墨烯（PGR）基纳米复合材料，并通过扫描电镜（SEM）、透射电镜（TEM）、X射线光电子能谱（XPS）、Zeta电位分析、傅里叶变换红外光谱（FTIR）和电化学阻抗谱（EIS）对其进行了表征。然后将该修饰电极沿着Nafion修饰在玻碳电极上，构建了同时检测Pb 2+和Cd 2+的电化学传感器。与裸GCE、还原氧化石墨烯/GCE和CLS/PGR/GCE相比，Nafion/CLS/PGR/GCE在检测两种离子方面表现出改善的电化学性能。这是由于PGR、CLS和Nafion的协同作用，使其具有高的活性表面积、良好的阳离子交换能力和强的吸附能力。在最佳条件下，该传感器对Pb ~（2+）和Cd ~（2+）具有较宽的检测范围（0.05-5.0 μM），Pb ~（2+）的检测限和定量限分别为0.01和0.03 μM，Cd ~（2+）的检测限和定量限分别为0.003和0.01 μM。用于真实的水样中Pb 2+和Cd 2+的同时测定，Pb 2+和Cd 2+的回收率分别为93.6-105.3%和93.5-102.5%，表明该方法用于环境金属污染物的测定是可行的。
Here, a new porous graphene (PGR) based nanocomposite was synthesized by a chemical and thermal reduction of graphite oxide in the assistance of calcium lignosulfonate (CLS), and characterized by scanning electron microscopy SEM, TEM, XPS, Zeta potential analysis, FTIR and EIS. Then the as-prepared CLS/PGR was used along with Nafion to modify a glassy carbon electrode (GCE) for constructing electrochemical sensor to detect Pb2+and Cd2+simultaneously. Compared with the bare GCE, the reduced graphene oxide/GCE, and the CLS/PGR/GCE, the Nafion/CLS/PGR/GCE exhibited improved electrochemical performance in detecting the two ions. It could be ascribed to the synergistic contribution from PGR, CLS and Nafion, which integrated the advantageous features of high active surface area, good cation exchange ability and strong adsorption capacity. Under optimum conditions, this novel sensor showed a wide detection range for Pb2+and Cd2+(0.05–5.0 μM) with the limit of detection and limit of quantification for Pb2+0.01 and 0.03 μM, for Cd2+0.003 and 0.01 μM, respectively. It was successfully applied for the simultaneous determination of Pb2+and Cd2+in real water samples with satisfying recoveries of 93.6–105.3% for Pb2+and 93.5–102.5% for Cd2+, demonstrating its feasibility for the determination of environmental metallic pollutants.
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