Amino-functionalized MCM-41 for the simultaneous electrochemical determination of trace lead and cadmium

被引：34
作者：
Dai, Xingxin [1 ]
Qiu, Fagui [2 ]
Zhou, Xuan [1 ]
Long, Yumei [1 ,3 ]
Li, Weifeng [1 ]
Tu, Yifeng [1 ,3 ]
机构：
[1] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China
[2] Jilin Univ, Dept Quartermaster Engn, Changchun 130062, Peoples R China
[3] Key Lab Hlth Chem & Mol Diag, Suzhou, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2014年 / 144卷
基金：
中国国家自然科学基金;
关键词：
NH2-MCM-41; Sensor; Anodic stripping voltammetry; Lead; Cadmium; ANODIC-STRIPPING VOLTAMMETRY; MESOPOROUS SILICA; HEAVY-METALS; FABRICATION; PLATFORM; MERCURY; LIQUID; PB(II); PB2+;
D O I：
10.1016/j.electacta.2014.08.093
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this work, a new strategy for the simultaneous determination of Pb2+ and Cd2+ was described based on amino-functionalized mesoporous silica (NH2-MCM-41) as sensing mediator. NH2-MCM-41 was prepared using a post-grafting process and the successful amino-functionality was confirmed by Fourier transform infrared (FTIR) and X-ray energy dispersive (EDS) spectra. It was found that both MCM-41- and NH2-MCM-41-modified glassy carbon (GC) electrode exhibit simultaneous response to Pb2+ and Cd2+. However, the NH2-MCM-41 modified electrode showed higher sensitivity than that of the MCM-41-modified one, which was attributed to the good chelating ability of amino groups to metal ions besides the high surface area and special mesoporous morphology of MCM-41. As a result, simultaneous assay of Pb2+ and Cd2+ was realized using anodic stripping voltammetric (ASV) method. Under the optimum experimental conditions, the linear response ranges for Pb2+ and Cd2+ ions are 0.5-250 mu gL(-1) and 50-450 mu gL(-1), respectively. The corresponding detection limits are 0.2 mu gL(-1) for Pb2+ and 1.0 mu gL(-1) for Cd2+, with good electrode renewability, which is defined as the complete removal of the accumulated metals from the electrode surface. In addition, the NH2-MCM-41 modified electrode was demonstrated for the successful determination of Pb2+ and Cd2+ in real samples, including tap water, lake water and tea. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：161 / 167
页数：7
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