Title: Catalytic wet peroxide oxidation of azo dye (Acid Orange 7) using NaY zeolite from coal fly ash

Authors: S. Suresh; Kusuma Ravi Teja; Shri Chand

Addresses: Department of Chemical Engineering, Maulana Azad National Institute of Technology, Bhopal-462 051, India ' Environment Department, My home Industries Limited, Mellacheruvu Cement Works, Nalgonda, Andhra Pradesh-508246, India ' Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee-247 667, India

Abstract: This work concerns the synthesis of NaY zeolite derived from low-cost materials like fly ash (FA) for degradation of Acid Orange 7 (AO7) by catalytic wet peroxide oxidation. Synthesised NaY zeolite is characterised using XRD, SEM/EDAX and FTIR. The results indicate that synthesised NaY zeolite is a promising catalyst for dye removal. The effects of various operating parameters like temperature, initial pH, hydrogen peroxide concentration and catalyst loading on the removal of dye, colour and COD from an aqueous solution were studied at atmospheric pressure. The percent removals of dye, colour and COD at optimum pH₀ 2, 90°C using 0.6 ml H₂O₂ solution and 1.5 g/l catalyst was 97% (in 4 h), 99.8% (in 45 min) and 70% (in 4 h), respectively. The % dye removal has been found to be less in comparison to % colour removal at all conditions, e.g., dye removal in 45 min and at above conditions was 82%, whereas the colour removal was 99.8%. Dye, colour and COD removals were maximum at pH₀ 2.

Keywords: catalytic wet oxidation; NaY zeolite; coal fly ash; azo dye; Acid Orange 7; wet peroxide oxidation; dye removal; colour removal; COD removal; chemical oxygen demand.

DOI: 10.1504/IJEWM.2014.066591

International Journal of Environment and Waste Management, 2014 Vol.14 No.4, pp.338 - 357

Accepted: 04 Feb 2014
Published online: 30 Dec 2014 *

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