Document Detail


Electrochemical dechlorination of chloroacetic acids (CAAs) using hemoglobin-loaded carbon nanotube electrode.
MedLine Citation:
PMID:  16185744     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Hemoglobin (Hb) was immobilized on carbon nanotube (CNT) electrode to catalyze the dechlorination of chloroacetic acids (CAAs), and the electrocatalytic behaviors of the Hb-loaded electrode for the dechlorination of trichloroacetic acid (TCAA) were studied by cyclic voltammetry and constant-potential electrolysis technique. An Hb-loaded packed-bed flow reactor was also constructed for bioelectrocatalytic dechloriantion of CAAs from drinking water. The results showed that the reduced heme of Hb immobilized on CNT electrode was easily regenerated, and Hb exhibited a stable and high activity for reductive dechlorination of CAAs with significant lowering of overpotential. TCAA could be reduced at -0.450 V (vs. saturated calomel electrode (SCE)) with catalysis of Hb-loaded electrode and its dechlorination was stepwise, following the pathway of TCAA-->dichloroacetic acid (DCAA)-->monochloroacetic acid (MCAA)-->acetic acid. It was also found that all CAAs, e.g., TCAA, DCAA and MCAA, could be dechlorinated completely at -0.450 V. The removal of 30.0 mM TCAA and DCAA is ca. 40% and 31%, respectively, with electrolysis for 100 min at -0.600 V (vs. SCE) using the Hb-loaded packed-bed flow reactor. The dechlorination activities of CAAs follow the decreasing order: TCAA>DCAA>MCAA, and the average current efficiency is over 90%.
Authors:
Yu-Ping Li; Hong-Bin Cao; Yi Zhang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-09-26
Journal Detail:
Title:  Chemosphere     Volume:  63     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-03-28     Completed Date:  2006-06-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  359-64     Citation Subset:  IM    
Affiliation:
Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, China.
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MeSH Terms
Descriptor/Qualifier:
Acetic Acids / chemistry,  isolation & purification*
Catalysis
Chlorine / chemistry*
Electrodes
Electrolysis
Hemoglobins / chemistry*
Nanotubes, Carbon*
Oxidation-Reduction
Water Pollutants, Chemical / isolation & purification*
Water Purification / methods
Chemical
Reg. No./Substance:
0/Acetic Acids; 0/Hemoglobins; 0/Nanotubes, Carbon; 0/Water Pollutants, Chemical; 7782-50-5/Chlorine

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