Evaluation of the Performance of a Rotary Photoreactor Equipped with Linear LED Light Sources in the Removal of Organic Dye Pollutants: Intermediate Products Analysis and Optimization of Operational Parameters

Document Type : Research

Authors

1 Department of Chemistry, Faculty of Science, University of Zanjan, P. O. Code: 4537138791, Zanjan, Iran

2 Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, P. O. Code: 5166614769, Tabriz, Iran

3 Health and Environment Research Center (HERC), Tabriz University of Medical Sciences, P. O. Code: 5166614711, Tabriz, Iran

10.30509/jscw.2025.167616.1252

Abstract

In this study, a custom-designed rotary photoreactor equipped with LED light and activated persulfate was employed to remove the persistent dye Basic Red 46 from aqueous solutions. Key operational parameters including initial dye concentration, persulfate dosage, cylinder rotation speed, and light source position were investigated. The results demonstrated that lower dye concentrations, increased persulfate dosage up to 50 mM, a moderate rotation speed (6 rpm), and positioning the LED on the left side of the reactor significantly enhanced removal efficiency. Kinetic analysis confirmed that the degradation process followed a pseudo-first-order model. TOC analysis showed a considerable reduction in organic content, indicating effective breakdown of the dye structure. Furthermore, GC-MS analysis identified intermediate compounds with simpler structures confirming the mineralization of the dye. These findings clearly demonstrate the high efficiency of the LED/persulfate system in degrading resistant dye pollutants and highlight its potential for sustainable industrial wastewater treatment.

Keywords

Main Subjects

References

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Journal of Studies in Color World
Volume 16, Issue 1
May 2026
Pages 46-35

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History

  • Receive Date: 30 July 2025
  • Revise Date: 16 September 2025
  • Accept Date: 27 September 2025

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