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Mineralization of an azo dye Acid Red 14 by photoelectro-Fenton process using an activated carbon fiber cathode

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Abstract.
The mineralization of an azo dye Acid Red 14 (AR14) by the photoelectro-Fenton (PEF) process was
studied in an undivided electrochemical reactor with a RuO2/Ti anode and an activated carbon fiber (ACF)
cathode able to electrochemically generate H2O2. Anodic oxidation and UV irradiation of AR14 were also
examined as comparative experiments. Results indicate that the electro-Fenton process yielded about
60–70% mineralization of AR14, while the photoelectro-Fenton could mineralize AR14 more effectively
(more than 94% total organic carbon (TOC) removal) even at low current densities assisted with UV
irradiation after 6 h electrolysis. The mineralization current efficiency (MCE) of the PEF process increased
with the increasing AR14 concentrations. In addition, the initial solution pH ranging from 1.49 to 6.72 had
little influence on the TOC removal probably due to the formation of organic carboxylic acids which
balanced the pH increase caused by the cathodic generation of hydrogen gas. The ACF cathode showed a
long-term stability during multiple experimental runs for degradation of AR14, indicating its good
potential for practical application in treating refractory organic pollutants in aqueous solutions.

Keywords: Photoelectro-Fenton process, Mineralization, Acid Red 14, Activated carbon fiber cathode

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis B: Environmental 84 (2008) 393–399

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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