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Photodegradation of red 40 via a manganese (II)-based photo-Fenton like process
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DOI：10.1016/j.rechem.2026.103177.png)
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Abstract
En 中文
Red 40 (R40) is an azo dye continuously discharged into wastewater effluents from the food, cosmetic, and textile industries. It is highly persistent, toxic, and potentially carcinogenic to aquatic organisms. Advanced oxidation processes (AOPs) of the Fenton type using manganese (II) represent a promising alternative for the degradation of dyes such as R40 through the generation of SOH radicals under UV irradiation, without the operational pH limitations. In this study, the degradation of R40 was evaluated using a solar photo-Fenton like process with Mn2+, HQOQ, and UV radiation from sunlight. Experiments were designed using a 33 factorial design to assess the effects of pH (4, 6, and 8), and the concentrations (mg L- 1) of Mn2+ (5, 7, and 10) and HQOQ (50, 100, and 150). Additionally, the influence of the initial dye concentration and the regeneration capacity of Mn2+ compared to Fe2+ over two cycles were investigated. Complete degradation of R40 (100%) was achieved. The degradation kinetics followed a pseudo-first-order model, with a rate constant of 60.9 & times; 10-3 min- 1. R40 was mineralized to COQ with a yield of 0.34 +/- 0.01. Mn2+ showed a higher regeneration capacity than Fe2+. This study lays the groundwork for the use of manganese (II) catalysts in the degradation of organic pollutants in water, with superior regeneration capacity compared to iron (II).
Keywords:
Degradation
Manganese
Photocatalysis
Photo-Fenton like process
Red 40 (E129)
Journal
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4.2
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506
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6.1K