Investigating the synergy of rapidly synthesized iron oxide predecessor and plasma-gaseous species for dye-removal to reuse water in irrigation

• Published in: Chemosphere (Oxford) Vol. 364; p. 143040
• Main Authors: Lamichhane, Prajwal, Acharya, Tirtha Raj, Dhakal, Oat Bahadur, Dahal, Roshani, Choi, Eun Ha
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-09-2024
• Subjects: Agriculture; Azo dye; Iron oxide predecessor; plasma generated gaseous species; Reactive oxygen species; Reactive oxygen species; plasma generated gaseous species; Agriculture; Iron oxide predecessor; Azo dye
• ISSN: 0045-6535; 1879-1298; 1879-1298
• DOI: 10.1016/j.chemosphere.2024.143040

This study explores a novel and sustainable approach to reusing textile wastewater for irrigation. This is investigated by degrading Evans blue dye, a model azo dye, in wastewater by combining iron oxide predecessor (IOP) catalyst with gaseous species generated by multi-electrode cylindrical plasma device (MCPD). Analysis of IOP-plasma gaseous species revealed the generation of different types of reactive oxygen species in solution which were responsible for degradation of model dye. Key factors influencing the degradation process were studied by performing optimization experiments that resulted in rates of up to 0.008 L mg−1 min−1, more than twice as fast as using plasma gas treatment alone. These studies included mechanistic response of MCPD generated gaseous species with the IOP. In particular, reusability testing of IOP affirmed the robustness and performance efficiency up to three cycles. Finally, toxicity analysis revealed not only reduced negative effects on plant growth by the treated wastewater, but also it can used as minerals to plants. These findings highlight the feasibility of the IOP-MCPD system as a sustainable and eco-friendly solution to reduce scarcity of water in irrigation by treating textile effluent.
[Display omitted]
•Iron oxide predecessor (IOP) can be synthesized inside ten minute.•IOP enhances degradation capacity of plasma-gaseous species, more than doubling rates.•IOP boost ozone conversion to other reactive oxygen species, enhancing treatment.•IOP are reusable for multiple cycles maintaining effectiveness.•IOP suppresses acidification and peroxide in treated water and aids plant growth.