Degradation of Dyestuffs from Industrial Effluents using an Ultrasonic Bath in the Presence and Absence of Various Inorganic Salts and H2O2

Abstract

Textile industries consume various dyestuffs for dyeing of fabrics. These dyestuffs are often present in industrial wastewater, have a serious impact on the environment and personal health. This report describes a system developed to degrade the dyestuffs using sonochemical reactions. The degradation of dye molecules in aqueous solution was investigated using 50-60 Hz ultrasonic bath, and all solutions volumes were 50 mL where the concentration of dye solution was 50 mg/L. Experiments were performed at an initial concentration of two types of dye solutions, i.e. Methylene Blue (MB) and Methyl Orange (MO) in absence and presence of inorganic salts (NaCl, Na2CO3, Na2SO4, NaNO3) and catalyst, i.e. H2O2 at room temperature. This research investigated the degradation of dye molecules with an aim of cost-effective method. In sonochemical degradation of dyestuffs in sonicator, high degradation rate for MB was obtained in the presence of additives H2O2 and followed the order: MB+H2O2> MB+ Na2CO3 > MB+Na2SO4> MB + NaCl> MB (0 mM salt & additive) > MB+NaNO3. Whereas, in case of MO, high rate was obtained in the presence of Na2SO4 and then followed the order: MO+Na2SO4> MO + NaNO3> MO+H2O2> MO + NaCl> MO (0 mM salt & additive) > MO+Na2CO3.