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ISSN:2394-3661 | Crossref DOI | SJIF: 5.138 | PIF: 3.854

International Journal of Engineering and Applied Sciences

(An ISO 9001:2008 Certified Online and Print Journal)

Rapid sun light degradation of Rhodamine-B, Methylene blue, Methyl orange, Congo red and their binary mixtures using suprastoichiometric Bi - Molybdate

( Volume 2 Issue 8,August 2015 ) OPEN ACCESS

P. Suresh, A.M. Umabala, A.V. Prasada Rao


Bi2(MoO4)3 with excess MoO3 has been prepared by combustion method using Bismuth nitrate, MoO3 and glycine. The sample as prepared showed excellent photocatalytic activity for the degradation of Rhodamine B, Methylene blue, Methyl orange and Congo red in presence of H2O2 under direct exposure to sun light. Complete degradation of separate 100ml aqueous solutions containing 5ppm Rhodamine B, 10ppm Methylene blue, 5ppm Methyl orange and 20ppm Congo red with 100 mg of dispersed catalyst occurred in 60, 120, 70 and 60 min respectively. Binary mixtures of aqueous solutions containing different dyes also showed complete bleaching in 60 to 150 min of exposure to sun light. Photoluminescence studies using terepthalic acid showed generation of .OH free radicals in the solution during irradiation. Synergitic effect is noticeable for Bi2Mo3O12 with MoO3 towards degradation of pure dyes as well as their mixtures. 

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