Document Detail


Ultrasensitive and simultaneous detection of heavy metal ions based on three-dimensional graphene-carbon nanotubes hybrid electrode materials.
MedLine Citation:
PMID:  25441878     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A green and facile method was developed to prepare a novel hybrid nanocomposite that consisted of one-dimensional multi-walled carbon nanotubes (MWCNTs) and two-dimensional graphene oxide (GO) sheets. The as-prepared three-dimensional GO-MWCNTs hybrid nanocomposites exhibit excellent water-solubility owing to the high hydrophilicity of GO components; meanwhile, a certain amount of MWCNTs loaded on the surface of GO sheets through π-π interaction seem to be "dissolved" in water. Moreover, the graphene(G)-MWCNTs nanocomposites with excellent conductivity were obtained conveniently by the direct electrochemical reduction of GO-MWCNTs nanocomposites. Seeing that there is a good synergistic effect between MWCNTs and graphene components in enhancing preconcentration efficiency of metal ions and accelerating electron transfer rate at G-MWCNTs/electrolyte interface, the G-MWCNTs nanocomposites possess fast, simultaneous and sensitive detection performance for trace amounts of heavy metal ions. The electrochemical results demonstrate that the G-MWCNTs nanocomposites can act as a kind of practical sensing material to simultaneously determine Pb(2+) and Cd(2+) ions in terms of anodic stripping voltammetry (ASV). The linear calibration plots for Pb(2+) and Cd(2+) ranged from 0.5μgL(-1) to 30μgL(-1). The detection limits were determined to be 0.2μgL(-1) (S/N=3) for Pb(2+) and 0.1μgL(-1) (S/N=3) for Cd(2+) in the case of a deposition time of 180s. It is worth mentioning that the G-MWCNTs modified electrodes were successfully applied to the simultaneous detection of Cd(2+) and Pb(2+) ions in real electroplating effluent samples containing lots of surface active impurities, showing a good application prospect in the determination of trace amounts of heavy metals.
Authors:
Hui Huang; Ting Chen; Xiuyu Liu; Houyi Ma
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Publication Detail:
Type:  Journal Article     Date:  2014-09-16
Journal Detail:
Title:  Analytica chimica acta     Volume:  852     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  45-54     Citation Subset:  IM    
Copyright Information:
Copyright © 2014 Elsevier B.V. All rights reserved.
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