Experimental design to optimise colour removal of diazo dye Congo Red using Zero-Valent Iron
by Animesh Debnath; Saswati Chakraborty
International Journal of Environment and Waste Management (IJEWM), Vol. 11, No. 3, 2013

Abstract: Two types of zero-valent iron named Iron Powder (IP) and Iron Wool (IW) were used for colour removal of Congo Red (CR) dye from aqueous solution. Strong acidic condition (pH 2–3) favoured 99% colour removal with 2454-2485 mg/g of dye removal capacity by IP and IW. Decolourization of CR followed first order kinetics. At acidic pH, COD (Chemical Oxygen Demand) removal was 14-15% probably by adsorption by various oxidised iron species and at pH 7, it increased to 85%, due to co-precipitation by iron oxide products. IW was reused for three successive cycles without compromising colour removal efficiency of CR.

Online publication date: Sat, 20-Sep-2014

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