title: [Reductive dechlorination of trichloroacetic acid by bioelectrochemically catalytic method].
abstract: Direct electrochemical behaviors of hemoglobin (Hb) immobilized on carbon nanotube (CNT) modified carbon paste electrode with adsorption were investigated. Cyclic voltammetry of Hb-CNT-modified electrode showed a pair of well-defined and nearly reversible peaks for HbhemeFe(III) /Fe(II) redox couple in pH = 7 PBS buffers. The electrocatalytic behaviors of Hb-CNT-modified electrode for the reductive dechlorination of trichloroacetic acid (TCA) were studied by cyclic voltammmetry and fixed-potential electrolysis technique, and the reductive mechanism of TCA was discussed by analysis of reduction products. The results showed that Hb-CNT-modified electrode possessed good electro-catalytic activity for reduction of TCA and the dechlorination of TCA was stepwise, following the pathway of trichloroacetic--> dichloroacetic--> monochloroacetic--> acetic. The dechlorination of TCA in waster water was investigated using a two-compartment flow reactor with working electrode compartment packed with Hb-CNT-modified graphite electrode. The conversion of TCA was 40.13% with electrolysis for 180 min at - 0.60V (vs. SCE).
authors.affiliation: Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Li
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Cao
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D002384:Catalysis; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D004572:Electrolysis; D006454:Hemoglobins / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry; D014238:Trichloroacetic Acid / Q000737:chemistry*
chemical_list: D006454:Hemoglobins; D037742:Nanotubes, Carbon; D014238:Trichloroacetic Acid