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Ultrasensitive and simultaneous detection of heavy metal ions based on three-dimensional graphene-carbon nanotubes hybrid electrode materials
Shandong University, Peoples R China.
2014 (English)In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 852, 45-54 p.Article in journal (Refereed) Published
Abstract [en]

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 p-p 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 Pb2+ and Cd2+ ions in terms of anodic stripping voltammetry (ASV). The linear calibration plots for Pb2+ and Cd2+ ranged from 0.5 mg L-1 to 30 mg L-1. The detection limits were determined to be 0.2 mg L-1 (S/N = 3) for Pb2+ and 0.1 mg L-1 (S/N = 3) for Cd2+ in the case of a deposition time of 180 s. It is worth mentioning that the G-MWCNTs modified electrodes were successfully applied to the simultaneous detection of Cd2+ and Pb2+ 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.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 852, 45-54 p.
Keyword [en]
Graphene-carbon nanotubes hybrid, Heavy metal ions, Differential pulse anodic stripping voltammetry, Detection
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-203216DOI: 10.1016/j.aca.2014.09.010ISI: 000344235900007Scopus ID: 2-s2.0-84912090504OAI: oai:DiVA.org:kth-203216DiVA: diva2:1081431
Note

QC 20170317

Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2017-11-29Bibliographically approved
In thesis
1. Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
Open this publication in new window or tab >>Electrochemical Application and AFM Characterization of Nanocomposites: Focus on Interphase Properties
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of graphene and conductive polyaniline nanomaterials in the field of electrochemistry is increasing due to their excellent conductivity, rapid electron transfer and high specific surface area. However, these properties are strongly dependent on the preparation processes. To accelerate the development of advanced electrochemical sensors for the simultaneous detection of trace amounts of heavy metal ions, two facile and green methods are proposed to improve their performance in this thesis. The first one was dedicated to make graphene-carbon nanotube hybrid nanocomposites. The introduction of carbon nanotubes not only greatly enhances the conductivity of graphene but also suppresses, to some degree, the aggregation between graphene nanosheets. Another method proposed in this thesis work was to synthesize a phytic acid doped polyaniline nanofiber based nanocomposite. The synergistic contribution from polyaniline nanofibers and phytic acid enhances the accumulation efficiency and the charge transfer rate of metal ions during the differential pulse anodic stripping voltammetry analysis. The above-mentioned nanocomposite modified electrodes were all successfully applied to real samples for the simultaneous detection of Cd2+ and Pb2+ with good recovery rates. Meanwhile, corrosion protection is another important branch in the field of electrochemistry. In this direction, an active alkyd-polyaniline composite coating with self-healing functionality was prepared. The polyaniline used in this thesis was doped with p-toluene sulfonic acid, which was employed to increase the conductivity of polyaniline, and 1 wt.% of as-prepared polyaniline nanoparticles were found to offer an effective conductive network for anticorrosion. Finally, the reasons that such low loading levels of nanomaterials can result in significantly reinforced properties in nanocomposites were studied with combined atomic force microscopy (AFM) techniques. The results demonstrated that the interphase for a 40-nm-sized silica particle could extend to 55–70 nm in poly(ethyl methacrylate) (PEMA) and poly(isobutyl methacrylate) (PiBMA) polymer matrix, and the interphase exhibited a gradient distribution in surface nanomechanical properties.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 72 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:13
Keyword
Electrochemical sensor, nanocomposite, graphene, carbon nanotubes, phytic acid, polyaniline, corrosion protection, silica nanoparticles, atomic force microscopy, interphase
National Category
Materials Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-203239 (URN)978-91-7729-285-2 (ISBN)
Public defence
2017-03-10, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170315

Available from: 2017-03-15 Created: 2017-03-14 Last updated: 2017-03-17Bibliographically approved

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