Work

Enhanced decolorization and mineralization of Metanil Yellow dye by combined ferrate (VI) and plasma-activated water

Year: 2025

Type: article

Abstract: Metanil Yellow (MY), a toxic and persistent azo dye, poses significant environmental challenges in wastewater treatment. This study explores the degradation and mineralization of MY using ferrate (Fe (VI)) alone and in combination with plasma-activated water (PAW). Optimal decolorization occurred at pH 7 with a second-order rate constant (kapp) of 93.73 M⁻¹·s⁻¹. An [MY]:[Fe (VI)] molar ratio of 1:8 ensured complete dye removal, while increasing the temperature to 45°C enhanced degradation kinetics (kapp = 193.65 M⁻¹·s⁻¹) with an activation energy of 52.86 kJ/mol. Despite high decolorization, Fe (VI) alone achieved limited mineralization (11–14%), indicating the presence of persistent intermediates. Computational toxicity estimation (USEPA TEST software) confirmed the formation of less toxic degradation products. To improve treatment performance, a hybrid Fe (VI)–PAW system was introduced, significantly enhancing decolorization (up to 95%) and mineralization (up to 35%). The synergistic effect factor (SEF) exceeded 1.0, especially in sequential Fe (VI)–PAW application. These results highlight the potential of the Fe (VI)–PAW process as an efficient and environmentally friendly advanced oxidation strategy for dye-contaminated wastewater.

Source: Environmental Engineering Research

DOI: 10.4491/eer.2025.322

Authors: Bimo Tri Goutomo, Amina Ouzar, Seong Yeop Han, KiJeon Nam, Dian Majid, Il-Kyu Kim

Language: English

Topic: Advanced oxidation water treatment

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: diamond

Funder: Pukyong National University

Award: G5622002197