Journal
CHEMELECTROCHEM
Volume 10, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202201017
Keywords
anodic stripping voltammetry; carbon composites; electrochemical sensors; heavy metals detectors; hydroxyapatite
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The study combines the excellent adsorption capacity of nanostructured hydroxyapatite (Hap) in heavy metal cations with the good electrical conductivity of high-surface carbon materials to fabricate high-content hydroxyapatite electrodes (Hap 84-96 wt.%). The electrodes demonstrate the synergistic capability of detection and adsorption of heavy metal cations in water solutions. A mesoporous carbon derived from bio-waste is used as a scaffold for depositing Hap by co-precipitation. The composite with 92 wt.% Hap shows superior sensitivity compared to low-content Hap electrodes reported in literature.
The great performance of nanostructured hydroxyapatite (Hap) in adsorbing heavy metal cations with the good electrical conductivity of high-surface carbon materials was here combined for the crafting of high-content hydroxyapatite electrodes (Hap 84-96 wt.%) endowed with the synergistic capability of detection and adsorption of heavy metal cations by water solutions. To improve the sustainability of the sensor, a mesoporous carbon (derivable by bio-waste) was selected as scaffold for depositing Hap by simply co-precipitation. The composite with 92 wt.% of Hap, which exhibited ca. 1 : 1 ratio between the exposed area of Hap and carbon (by Brunauer-Emmett-Teller method), invariably showed an average stripping oxidation peak intensity of ca. 250 mu A cm(-2) and 150 mu A cm(-2) for a 50 mu M Pb2+ and Cu2+ solution, respectively. Control experiments showed that the above sensor outperformed the sensibility of two low-content Hap electrodes (4 and 8 wt.%), representative of the best performing Hap-carbon composites available in literature.
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