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Synthesis of a novel electrode material containing phytic acid-polyaniline nanofibers for simultaneous determination of cadmium and lead ions
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. Shandong Univ, Peoples R China.
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2016 (English)In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 947, 32-41 p.Article in journal (Refereed) Published
Abstract [en]

The development of nanostructured conducting polymers based materials for electrochemical applications has attracted intense attention due to their environmental stability, unique reversible redox properties, abundant electron active sites, rapid electron transfer and tunable conductivity. Here, a phytic acid doped polyaniline nanofibers based nanocomposite was synthesized using a simple and green method, the properties of the resulting nanomaterial was characterized by electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). A glassy carbon electrode modified by the nanocomposite was evaluated as a new platform for the simultaneous detection of trace amounts of Cd2+ and Pb2+ using differential pulse anodic stripping voltammetry (DPASV). The synergistic contribution from PANI nanofibers and phytic acid enhances the accumulation efficiency and the charge transfer rate of metal ions during the DPASV analysis. Under the optimal conditions, good linear relationships were obtained for Cd2+ in a range of 0.05–60 μg L−1, with the detection limit (S/N = 3) of 0.02 μg L−1, and for Pb2+ in a range of 0.1–60 μg L−1, with the detection limit (S/N = 3) of 0.05 μg L−1. The new electrode was successfully applied to real water samples for simultaneous detection of Cd2+ and Pb2+ with good recovery rates. Therefore, the new electrode material may be a capable candidate for the detection of trace levels of heavy metal ions.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 947, 32-41 p.
Keyword [en]
Bismuth film electrode, Differential pulse anodic stripping voltammetry, Heavy metal ions, Phytic acid, Polyaniline nanofibers, Simultaneous determination
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-203218DOI: 10.1016/j.aca.2016.10.012ISI: 000388108700005Scopus ID: 2-s2.0-84995680331OAI: oai:DiVA.org:kth-203218DiVA: diva2:1081438
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)
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Supervisors
Note

QC 20170315

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

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