Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 42, Issue 10, Pages 867-874Publisher
SPRINGER
DOI: 10.1007/s10800-012-0460-y
Keywords
Polypyrrole; Modified electrodes; Arsenic; Arsenic removal; Arsenic sensor
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Funding
- FONDECYT [1100055]
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Electrochemical methods has led to the preparation of a poly(pyrrole)-modified steel electrode (SS/PPy) for testing and optimizing the polymer doping/undoping process for arsenic(V) removal. Potentiodynamic (cyclic voltammetry) electropolymerization optimal range was between -0.200 and 0.980 V vs SCE. On the other hand, the potentiostatic optimal working potential was 0.980 V. SS/PPy-modified electrode prepared under either of these optimum conditions displayed a doping/undoping process occurring at 0.700 and -0.200 V, respectively. Hence, As(V) extraction or removal was performed by incorporating the cation to SS/PPy applying a 0.700 V constant potential. Then, As(V) doped SS/PPy was transferred to another cell, in which the undoping potential (-0.200 V) was applied to remove the ion from the polymer matrix, completing thus the extraction cycle (EC). This way, for instance, with a SS of 10 cm 2 geometric area and potentiostatic deposition carried out for 10 min, arsenic removal rates over 77 % were attained for 10 EC of 60 s each. This outcome allows predicting a promising future for the method as As(V) extractor from aqueous solutions. Furthermore, the modified electrode exhibited acceptable conditions for developing a likely arsenic sensor, since a linear current vs As(V) concentration relationship exits, at least in the order of concentrations used herein (50-500 ppm).
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