Sensitive stripping voltammetry detection of Pb(II) at a glassy carbon electrode modified with an amino-functionalized attapulgite

[Display omitted] •Attapulgite was modified by covalent grafting of [3-(2-Amino ethylamino)propyl]trimethoxysilane.•The obtained organoclay was fully characterised and shown to be a prominent material for the building of stable and sensitive amperometric sensor.•The obtained sensor display a detecti...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-04, Vol.242, p.1027-1034
Main Authors: Jiokeng, Sherman L.Z., Dongmo, Liliane M., Ymélé, Ervice, Ngameni, Emmanuel, Tonlé, Ignas K.
Format: Article
Language:English
Subjects:
Aminofunctionalisation
Anodic stripping
Attapulgite
Coating effects
Device alarms
Drinking water
Electroanalysis
Electrodes
Electrolytic analysis
Film modified electrode
Glassy carbon
Grafting
Infrared analysis
Lead(II)
Organic chemicals
Organic chemistry
Organoclay
Parameter modification
Sensors
Stripping
Voltammetry
X-ray diffraction
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Summary:[Display omitted] •Attapulgite was modified by covalent grafting of [3-(2-Amino ethylamino)propyl]trimethoxysilane.•The obtained organoclay was fully characterised and shown to be a prominent material for the building of stable and sensitive amperometric sensor.•The obtained sensor display a detection limit estimated at 0.88×10−12M, allowing the determination of Lead(II) in tap water. The electroanalysis of Pb2+ ions using an organoclay modified electrode is reported herein. The amine functionalized attapulgite used as electrode modifier was prepared by the covalent grafting of [3-(2-Aminoethylamino)propyl]trimethoxysilane (AEPTMS). The properties of the obtained hybrid material were studied by various physico-chemical techniques, including infrared spectroscopy, X-ray diffraction and CHN elemental analysis that together confirmed the effectiveness of the grafting process. The modified clay was then coated as thin film onto the active surface of a glassy carbon electrode (GCE) and the resulting modified electrode was evaluated for the electrochemical determination of Pb2+. A two-step analytical procedure was used: the accumulation at open circuit of Pb2+ and its detection by anodic stripping differential pulse voltammetry. Various experimental parameters that can influence i-E curves of Pb2+ at the GCE modified electrode were fully investigated and optimized. A linear response for Pb2+ was obtained in the concentration range from 4×10−12M to 4×10−11M, with a detection limit estimated at 0.88×10−12M (S/N=3). The interfering effect of some ions likely to influence the stripping determination of Pb2+ was evaluated and the proposed method was successfully applied to the analysis of laboratory tap water.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.09.150