Experimental Research on Organic Dye Removal from Polluted Water using the Oxidation Method
Year: 2025
Type: article
Abstract: Electrochemical, biological, adsorption, and oxidative methods can be applied for the treatment of synthetic wastewater containing methyl orange (MO). In this study, MO was catalytically oxidised using ferrous sulphate (FeSO 4 ) and hydrogen peroxide (H 2 O 2 ). The effects of reagent concentrations, initial dye concentration, contact time, and pH on treatment efficiency were investigated, and the optimal process conditions were identified. FeSO 4 and H 2 O 2 are cost-effective and environmentally benign reagents: excess hydrogen peroxide decomposes into water, while the small amount of iron introduced does not significantly impair the quality of the treated effluent. The results showed that increasing the FeSO 4 concentration from 0.02 % to 2.00 % enhanced the removal efficiency of C-MO from 81.5 % to 98.7 %, as the higher availability of Fe 2+ ions accelerates the formation of HO ● radicals. Increasing the H 2 O 2 concentration from 0.6 % to 24 % raised the efficiency from 81.1 % to 94.5 %, and the highest degradation efficiency was achieved at pH 2.00 - 3.00, confirming that optimal Fenton reaction performance occurs under mildly acidic conditions. Investigation of the initial dye concentration revealed that the efficiency ranged from 80.4 % to 89.1 % when the dye concentration increased from 50 mg/L to 750 mg/L, while the reduction at higher concentrations indicates an insufficient amount of HO ● radicals. Contact time studies showed that the efficiency increased from 39.8 % to 97.1 %, with the optimal reaction time being 2 hours. Overall, the findings demonstrate that the Fenton process is a highly effective method for the degradation of azo dyes and holds strong potential for application in wastewater treatment systems.
Authors: Dainius Paliulis, Rasa Vaiškūnaitė
Institution: Vilnius Gediminas Technical University
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7119485622