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Title: The efficiency of toxic chromate reduction by a conducting polymer (polypyrrole): Influence of electropolymerization conditions

Abstract

Studies of pollution due to hexavalent chromium are important because it represents a risk to human health and the environment. Hexavalent chromium is a toxic substance and has been found to be carcinogenic. Fortunately, its reduced form, Cr(III), is much less toxic. This paper discusses the remediation Cr(VI) by its reduction in aqueous media by polypyrrole (PPy)-coated reticulated citreous carbon substrates (RVC). The study is focused on the effect of PPy-film electropolymerization conditions and its efficiency toward the reduction of toxic chromate. The authors have studied parameters such as the influence of the polymerization electrolyte, the scan rate, the potential limits, and the polymerization cycles concerning the reduction capability of the film. Key results obtained in the present study show that in the presence of different anions during formation of the PPy film, the efficiency of chromate reduction depends on the nature of the anion. They found that the films prepared and treated in the presence of Kl performed much better and lasted much longer than those prepared in the presence of KF. Films synthesized at lower scan rates, and higher positive potential limits showed higher chromate reduction efficiencies. Some of their results show reduction of ca. 100% of Cr(VI)more » from a 10 mg/L solution, even after using the film in 20 contacts with the chromium solution, with films synthesized in KBr and Kl electrolytes, at a scan rate of 20 mV/s, between {minus}0.3 and 0.9 V and 40 polymerization cycles. Their study shows that remediation of Cr(VI) by reduction with PPy-coated substrates could be developed into an effective method toward the solution of this problem.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. de Guanajuato (MX)
OSTI Identifier:
20080463
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 34; Journal Issue: 10; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; GROUND WATER; REMEDIAL ACTION; CHROMIUM; PYRROLES; REDUCTION; POLYMERIZATION; ELECTROCATALYSTS

Citation Formats

Rodriguez, F.J., Gutierrez, S., Ibanez, J.G., Bravo, J.L., and Batina, N. The efficiency of toxic chromate reduction by a conducting polymer (polypyrrole): Influence of electropolymerization conditions. United States: N. p., 2000. Web. doi:10.1021/es990940n.
Rodriguez, F.J., Gutierrez, S., Ibanez, J.G., Bravo, J.L., & Batina, N. The efficiency of toxic chromate reduction by a conducting polymer (polypyrrole): Influence of electropolymerization conditions. United States. doi:10.1021/es990940n.
Rodriguez, F.J., Gutierrez, S., Ibanez, J.G., Bravo, J.L., and Batina, N. Mon . "The efficiency of toxic chromate reduction by a conducting polymer (polypyrrole): Influence of electropolymerization conditions". United States. doi:10.1021/es990940n.
@article{osti_20080463,
title = {The efficiency of toxic chromate reduction by a conducting polymer (polypyrrole): Influence of electropolymerization conditions},
author = {Rodriguez, F.J. and Gutierrez, S. and Ibanez, J.G. and Bravo, J.L. and Batina, N.},
abstractNote = {Studies of pollution due to hexavalent chromium are important because it represents a risk to human health and the environment. Hexavalent chromium is a toxic substance and has been found to be carcinogenic. Fortunately, its reduced form, Cr(III), is much less toxic. This paper discusses the remediation Cr(VI) by its reduction in aqueous media by polypyrrole (PPy)-coated reticulated citreous carbon substrates (RVC). The study is focused on the effect of PPy-film electropolymerization conditions and its efficiency toward the reduction of toxic chromate. The authors have studied parameters such as the influence of the polymerization electrolyte, the scan rate, the potential limits, and the polymerization cycles concerning the reduction capability of the film. Key results obtained in the present study show that in the presence of different anions during formation of the PPy film, the efficiency of chromate reduction depends on the nature of the anion. They found that the films prepared and treated in the presence of Kl performed much better and lasted much longer than those prepared in the presence of KF. Films synthesized at lower scan rates, and higher positive potential limits showed higher chromate reduction efficiencies. Some of their results show reduction of ca. 100% of Cr(VI) from a 10 mg/L solution, even after using the film in 20 contacts with the chromium solution, with films synthesized in KBr and Kl electrolytes, at a scan rate of 20 mV/s, between {minus}0.3 and 0.9 V and 40 polymerization cycles. Their study shows that remediation of Cr(VI) by reduction with PPy-coated substrates could be developed into an effective method toward the solution of this problem.},
doi = {10.1021/es990940n},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 10,
volume = 34,
place = {United States},
year = {2000},
month = {5}
}