Synthesis, characterization and application of magnetic carbon materials as electron shuttles for the biological and chemical reduction of the azo dye Acid Orange 10

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Pereira, L (Author) Other; Dias, P (Author) Other; O.S.G.P. Soares (Author) FEUP; Ramalho, PSF (Author) Other; Manuel Fernando R Pereira (Author) FEUP; Alves, MM (Author) Other

Journal

Title: Applied Catalysis B: Environmental

Vol. 212

Pages: 175-184

ISSN: 0926-3373

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 31 Citations

ISI Web of Science

Scopus - 35 Citations

Other information

Authenticus ID: P-00M-SKY

DOI: 10.1016/j.apcatb.2017.04.060

Abstract (EN): A set of core(ferrite, FeO)-shell(carbon, C) composites, C@FeO, C@MnFeO, C@CoFeO, and carbon nano tubes (CNT) impregnated with 2% of Fe (CNT@2%Fe) were prepared. The different composites were tested as redox mediators (RM) in the biological reduction of the azo dye Acid Orange 10 (A010). Materials were tested at different concentrations from 0.1 to 1.0 g L-1. In the absence of RM, the A010 decolourisation after 24 h of reaction was only 30% at a rate of 0.2 d(-1). In the presence of the core-shell composites, better results were obtained with C@FeO materials at the amount of 1.0 g L-1. The extent of A010 decolourisation was above 90% and rate improved circa 29-fold. With CNT@2%Fe, the best efficiency (98 +/- 3%) was achieved with 0.5 g L-1 leading to a 79-fold rate increase. In abiotic controls, though at lower extent, the reduction of the dyes also occurred likely due to the electron transfer from Fez' to carbon and then to the dye. To prove this, assays combining single CNT and FeO materials were performed, and FeO had effect in the reaction only when combined with CNT. In the biological assay, the rate was the double and the percentage of decolourisation increased from (88 +/- 6)% to (97 +/- 1)%, when both materials were present in solution as compared with results in the presence of CNT alone. Under abiotic conditions, decolourisation occurred only in the presence of both materials, with a final percentage of (54 +/- 2)%. Owing to their magnetic character, materials were removed from the media and successfully applied in successive cycles. (C) 2017 Elsevier B.V. All rights

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10