Remediation of chromium(VI) at polypyrrole-coated titanium

Earley, Sean T. and Alcock, Bernadette E. and Lowry, John P. and Breslin, Carmel B. (2009) Remediation of chromium(VI) at polypyrrole-coated titanium. Journal of Applied Electrochemistry, 39 (8). pp. 1251-1257. ISSN 0021-891X

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The application of conducting polypyrrole (PPy) and polyaniline (PAni) coated substrates in remediation of chromium, Cr(VI), is an area of considerable interest. Here, we discuss the implementation of PPy-coated titanium as a new material for the reduction of Cr(VI) to the less toxic trivalent state, Cr(III). An alkaline-peroxide based etching process was used to ensure the adhesion of the PPy coatings to the underlying titanium. The PPy films showed excellent resistance to acidic Cr(VI) solutions and remained adherent after continuous exposure to the solutions. In order to optimise the remediation process a number of experimental parameters were investigated, including the thickness of the PPy coating, the reduction potential used in pre-treatment of the PPy and the degree of solution agitation. The durability of the materials on exposure to the Cr(VI) test solutions made them suitable for repeated remediation experiments. Following several test-runs, the cleanup efficiency of the material was found to decrease slightly, however, increasing the exposure/experiment time resulted in significantly improved cleanup ability.

Item Type: Article
Additional Information: Cite this article as: Earley, S.T., Alcock, B.E., Lowry, J.P. et al. J Appl Electrochem (2009) 39: 1251. doi:10.1007/s10800-009-9789-2
Keywords: Electropolymerization; Chromium remediation; Pollution control; Polypyrrole; Titanium;
Academic Unit: Faculty of Science and Engineering > Chemistry
Item ID: 7921
Identification Number: 0.1007/s10800-009-9789-2
Depositing User: Dr. Carmel Breslin
Date Deposited: 14 Feb 2017 16:19
Journal or Publication Title: Journal of Applied Electrochemistry
Publisher: Springer Verlag
Refereed: Yes
Funders: Health Research Board (HRB), Environmental Protection Agency (EPA)

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