Malachite Green Degradation in Aqueous Solution via UV/H2O2 Route and Comparison of the Degradation using Fenton-like reagent

IJEP 46(4): 318-325 : Vol. 46 Issue. 4 (April 2026)

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Kinjal Kumar Dey1, Trina Dutta2, Prerna Sahani1, Anannya Nath1 and Sangita Bhattacharjee1*

1. Heritage Institute of Technology, Department of Chemical Engineering, Kolkata – 700 107, West Bengal, India
2. JIS College of Engineering, Department of Chemistry, Kalyani – 741 235, West Bengal, India

Abstract

Since textile effluent contains harmful organic dyes, chemicals and other contaminants that pollute waterbodies and because the colour of the effluent can block sunlight, hindering photosynthesis in aquatic plants, proper treatment of dye-containing textile wastewater must be efficiently performed before discharging it into waterbodies. In this study, UV/H2O2 photocatalysis was used to degrade Malachite Green (MG) dye in water within an annular UV reactor. Malachite Green, a shiny green dye, is used for dyeing wool, silk, leather, cotton, jute and for biological staining. Since Malachite Green is non-biodegradable and toxic, removing it from textile effluent is crucial to protect aquatic flora and fauna from exposure. The combined effect of ultraviolet light and hydrogen peroxide proved effective in significantly reducing dye concentration. A substantial removal of 96.52% was achieved using 26.45±0.36 mM/L H2O2 over 120 min in this UV-irradiated reactor with an initial dye concentration of 50 ppm. Additionally, using a Fenton-like reagent system, such as FeCl3/H2O2 followed by UV treatment resulted in 99.32% degradation of Malachite Green dye.

Keywords

Advanced oxidation process, UV/H2O2, Malachite Green, Photocatalysis, Kinetic study

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