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Indexed by:期刊论文

Date of Publication:2012-09-15

Journal:JOURNAL OF HAZARDOUS MATERIALS

Included Journals:SCIE、EI、PubMed、Scopus

Volume:231

Page Number:105-113

ISSN No.:0304-3894

Key Words:Titanium nitride; Cathode; Electrocatalysis; Debromination

Abstract:An energetic TiN cathode was fabricated for effective electrocatalytic debromination of 2,2',4,4'-tetrabromodiphenyl ethers (BDE-47); this was achieved by placing Ti foils in an aqueous suspension of TiN nanoparticles, then drying the system at 50 degrees C for 12 h. TEM and SEM characterization showed that the TiN nanoparticles-whose average size was approximately 50 nm-were ideal nano-cubic structures and distributed uniformly on the Ti substrate. When applied as a cathode in cyclic voltammetry measurements, the TiN electrode exhibited stable electrochemical performance over 20 cycles, in the similar to 1-10 pH range. The overpotential of the TiN cathode for electrochemical reduction of water (the main side reaction during the electrocatalytic reduction of pollutants in aqueous solution) was determined as 0.54V, which was much higher than the values for either a Pt wafer (0.12 V), or a Pt film (0.07 V). The TiN electrodes displayed superior electrocatalytic activity for the electrocatalytic debromination of BDE-47. The kinetic constant of BDE-47 degradation on TiN cathode is 0.65 h(-1), which was 2,4 and 17 times as much as those on Pt film, Pt wafer and graphite cathodes, respectively. A pathway was proposed for the degradation of BDE-47, based on measurements of the intermediate products resulting from the removal of BDE-47 by GC-MS. (C) 2012 Elsevier B.V. All rights reserved.