Catalytic degradation of methylene blue in aqueous solutions over Ni- and Co- oxide systems

✍ Scribed by Stoyanova, Maria ;Christoskova, Stoyanka

• Book ID: 111488271
• Publisher: Walter de Gruyter GmbH
• Year: 2011
• Tongue: English
• Weight: 1018 KB
• Volume: 9
• Category: Article
• ISSN: 2391-5420
• DOI: 10.2478/s11532-011-0086-7

✦ Synopsis

Abstract

The oxidative catalytic degradation of the cationic dye methylene blue (MB) with NaOCl in aqueous solutions was studied using individual and iron modified Ni- and Co-oxide systems as catalysts. The adsorption extent and the contribution of the uncatalyzed oxidation on the overall degree of MB were determined. The results indicate that methylene blue—a representative of a class of dyestuffs resistant to biodegradation—could be successfully decolorized and degraded using nickel and cobalt oxide catalysts at room temperature. The highest catalytic activity manifests in the Co-oxide system which is consistent with the adsorption data. The oxidative degradation reaction proceeds via first-order kinetics. Temperature has a relatively small effect on the methylene blue degradation kinetics. The results obtained reveal that the catalysts investigated are suitable for oxidative destruction of methytlene blue dye in wastewaters.