Voltammetric investigation of the complexing effect of Capparis spinosa on heavy metals: Application in the treatment of water

In the present study, we have investigated the effect of aqueous extracts of Capparis spinosa leaves (AECSL), buds (AECSB), and fruits (AECSF) on Pb 2+ ions. The carbon paste electrode modified with 10% 2-benzimidazole thiol (CPE-10% BIT) is used to reveal the electrochemical behavior of Pb 2+ in th...

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Bibliographic Details
Published in:Ionics 2023-12, Vol.29 (12), p.5441-5452
Main Authors: Laghlimi, Charaf, Moutcine, Abdelaziz, Chtaini, Abdelilah, Isaad, Jalal, Zannou, Abderrahim, Ziat, Younes, Ahari, M’hamed
Format: Article
Language:English
Subjects:
Adsorption
Bonding
Chemistry
Chemistry and Materials Science
Complexation
Condensed Matter Physics
Electrochemical analysis
Electrochemistry
Energy Storage
Heavy metals
Lead
Optical and Electronic Materials
Renewable and Green Energy
Square waves
Voltammetry
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Summary:In the present study, we have investigated the effect of aqueous extracts of Capparis spinosa leaves (AECSL), buds (AECSB), and fruits (AECSF) on Pb 2+ ions. The carbon paste electrode modified with 10% 2-benzimidazole thiol (CPE-10% BIT) is used to reveal the electrochemical behavior of Pb 2+ in the presence of the aqueous extract of Capparis spinosa (AECS). Square wave voltammetry (SWV) and cyclic voltammetry (CV) have been used to characterize the electrochemical properties of CPE-10% BIT, while scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) have been applied to study its surface morphology. The presence of AECSL resulted in the complete disappearance of one of the three characteristic Pb 2+ peaks observed at − 0.4 V, demonstrating the plant’s strong complexation/adsorption capacity. The efficiency of the extract increases linearly with the volume of AECS in the concentration range from 16.66 to 66.66 ml/l (0.24–0.97 g/l) with a complexing effect of 86.08%, 86.1%, and 72.54% at 83.83 ml/l for AECSL, AECSB, and AECSF, respectively. This capacity is related to the hydroxyl (–OH) and pyrone ions present in the aqueous extract, which bind to the Pb 2+ ions present in the electrolyte solution, forming a complex with multiple coordination bonds. The effect of the contact time between AECSL and Pb 2+ was studied and it was observed that 24.57% complexation/adsorption was reached after 22 min, then this percentage starts to decrease gradually with time.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-023-05194-6