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Electrochemical removal of RRX-3B in residual dyeing liquid with typical engineered carbonaceous cathodes.
Lu, Jun; Ayele, Befkadu A; Liu, Xiaochen; Chen, Quanyuan.
Afiliação
  • Lu J; School of Environment Science and Engineering, Donghua University, Shanghai, 201620, PR China.
  • Ayele BA; School of Environment Science and Engineering, Donghua University, Shanghai, 201620, PR China.
  • Liu X; School of Environment Science and Engineering, Donghua University, Shanghai, 201620, PR China.
  • Chen Q; School of Environment Science and Engineering, Donghua University, Shanghai, 201620, PR China; Shanghai Institution of Pollution Control and Ecological Security, Shanghai, 200092, PR China; State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Don
J Environ Manage ; : 111669, 2020 Nov 21.
Artigo em Inglês | MEDLINE | ID: mdl-33234317
ABSTRACT
Electro-catalytic activities of carbonaceous cathodes including graphite plate, graphite felt, carbon felt, activated carbon felt (ACF) and carbon fiber felt (CFF) for degradation of Reactive Red X-3B (RRX-3B) in residual dyeing liquid were compared. The best electrochemical performance was obtained using dimensional stable anode (DSA) and CFF cathode due to the higher capacity for electro-generation of H2O2 by selective two-electron oxygen reduction. The CFF/DSA electrolysis system realized 78.2% COD removal and complete decolorization over a wide pH range. The efficacy of RRX-3B degradation was found to be dependent on the nature of carbonaceous materials. Electrochemical measurements showed that CFF possessed higher electrochemical surface area and hydrogen evolution reaction over-potential. Furthermore, the intrinsic graphitic N in CFF was proved to be catalytic active site by DFT calculations. Reactive Red X-3B degradation intermediates with benzene structures and carboxylic acids via hydroxylation in RRX-3B oxidation were identified by GC-MS. It was found that S/Cl/N-containing groups in RRX-3B molecule were mineralized to SO42-, NO3- and Cl- ions in the electrolysis.
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Environ Manage Ano de publicação: 2020 Tipo de documento: Artigo

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Environ Manage Ano de publicação: 2020 Tipo de documento: Artigo
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