Document Detail

Ion/electron coupled transport through polyaniline membrane: fast transmembrane redox reactions at neutral pH.
MedLine Citation:
PMID:  18489136     Owner:  NLM     Status:  MEDLINE    
Different oxidizing and reducing agents can be separated by a solid polymer membrane, but they still react. The possibility to conduct this type of transmembrane redox reactions coupled with electroneutral electron/chloride countertransport is demonstrated here for polyaniline (PANI) membrane doped with camphor sulfonic acid (CSA). For the 80 microm film, the transmembrane reaction rate can be as high as 5 x 10 (-8) mol/(cm (2) s) with FeCl 3 as the oxidizing and ascorbic acid as the reducing agents, which is approximately 25 times higher than described by us earlier with HCl-doped PANI membrane. Both solutions separated by the membrane with CSA can have pH near neutral, which is impossible with HCl-doping. Advanced kinetic mechanism of electron/ion coupled transport including chloride equilibrium at the interface is proposed, and major kinetic parameters are estimated. Interfacial redox rate constants (cm/s) are compared with the rate constants determined for polarized membranes by electrochemical methods and also with usual first and second order rate constants in the bulk volume. Possibility to conduct different redox reactions between substances which are not mixed and are separated by a membrane makes this new process very attractive for chemical and environmental engineering.
Nikolai M Kocherginsky; Zheng Wang
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Publication Detail:
Type:  Journal Article     Date:  2008-05-20
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  112     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-06-05     Completed Date:  2008-08-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7016-21     Citation Subset:  IM    
Biomime, 909 E. Sunnycrest Drive, Urbana, IL 61801, U.S.A.
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MeSH Terms
Aniline Compounds / chemistry*
Hydrogen-Ion Concentration*
Reg. No./Substance:
0/Aniline Compounds; 0/Ions; 0/polyaniline

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