Authors

1 Department of Environmental Health Engineering, Faculty of Health, Kashan University of Medical Sciences, Kashan, Iran

2 Department of Environmental Health Engineering, School of Health, Kashan University of Medical Sciences, Kashan, Iran

3 Department of Epidemiology and Biostatistics, School of Health Kashan University of Medical Sciences, Kashan, Iran

4 Department of Environmental Health Engineering, Mamasani Higher Education Complex for Health, Shiraz University of Medical Sciences, Shiraz, Iran.

Abstract

Background and Purpose: Acidic dyes, such as Acid Orange 7, pose significant environmental and health risks due to their carcinogenic and mutagenic properties. These pollutants resist biological degradation, remaining persistent in conventional wastewater treatments. This study evaluates the removal of Acid Orange 7 using a combined UV/Alg@Fe₃O₄-ZnO/O₃ process.

Materials and Methods: A 300 mL laboratory-scale reactor was used with a UVA lamp and Fe₃O₄-ZnO nanoparticles synthesized on alginate. Structural characteristics of the nanocomposite were analyzed using XRD, VSM, and FTIR. Catalyst concentration (0.1, 0.2, and 0.5 g/L), pollutant concentration (100, 200, and 300 mg/L), reaction time (20, 40, and 60 minutes), and pH levels (3, 7, and 11) were evaluated for their impact on degradation efficiency.

Results: Optimal removal efficiency of 97% was achieved with 0.2 g/L catalyst concentration, 100 mg/L pollutant concentration, 40 minutes of reaction time, and a neutral pH. Removal efficiency increased with higher catalyst concentrations, longer reaction times, and neutral-to-alkaline pH but decreased with increasing pollutant concentrations.

Conclusion: The UV/Alg@Fe₃O₄-ZnO/O₃ process effectively degrades Acid Orange 7 in aqueous solutions, demonstrating high efficiency and potential for dye wastewater treatment.
 
Open Access Policy: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/

Keywords

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