Electrochemical Detection of Lead Ions with Ordered Mesoporous Silica–Modified Glassy Carbon Electrodes

The development of methods for lead ion determination in various biological and environmental samples is both necessary and challenging. In this context, considering the properties of both SBA-15 and MCM-41 mesoporous materials and the role of NH 2 -functional groups grafted on the silica surface (S...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2020-05, Vol.231 (5), Article 217
Main Authors: Cotolan, Nicoleta, Mureşan, Liana Maria, Salis, Andrea, Barbu-Tudoran, Lucian, Turdean, Graziella Liana
Format: Article
Language:English
Subjects:
Acetates
Acetic acid
Anodic stripping
Atmospheric Protection/Air Quality Control/Air Pollution
Carbon
Climate Change/Climate Change Impacts
Cost analysis
Detection
Earth and Environmental Science
Electric properties
Electrochemical analysis
Electrochemistry
Electrodes
Electron microscopy
Electrons
Environment
Environmental monitoring
Functional groups
Glassy carbon
Hydrogeology
Lead
Oxidation
Scanning electron microscopy
Silica
Silica glass
Silicon dioxide
Silver chloride
Soil Science & Conservation
Square waves
Stripping analysis
Water Quality/Water Pollution
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Summary:The development of methods for lead ion determination in various biological and environmental samples is both necessary and challenging. In this context, considering the properties of both SBA-15 and MCM-41 mesoporous materials and the role of NH 2 -functional groups grafted on the silica surface (SBA-15-NH 2 and MCM-41-NH 2 ), the aim of the study was to investigate the electrochemical detection of Pb 2+ by means of silica-modified glassy carbon electrodes (GCEs). The square wave anodic stripping voltammetry (SWASV) was used to characterize the modified electrodes with four different samples of ordered mesoporous silica (OMS) powders, mentioned above. Additionally, scanning electron microscopy (SEM) was used to characterize these modifiers. Pb 2+ exhibits a well-defined oxidation peak (around − 0.5 V vs. Ag/AgCl/KCl sat ) and high peak current at either bare or OMS-modified glassy carbon electrodes, but the best response was recorded in the case of GC/SBA-15-NH 2 -modified electrode in 0.1 M acetate buffer. The performance of the prepared electrodes is highlighted by good analytical parameters (satisfies the requirements of low cost and rapid results), which recommends them to be used for real sample analysis.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-020-04599-7