Synergistic effects of process parameters on methylene blue degradation by cold plasma

Eliminating dye pollutants from water systems is essential to prevent long-term environmental damage, as these substances can hinder photosynthesis, reduce water quality, and introduce harmful chemicals into aquatic ecosystems. This study explores the potential of non-thermal plasma technology, specifically the Dielectric Barrier Discharge configuration, for the degradation of Methylene Blue dye in aqueous solutions. A systematic investigation was conducted to assess the influence of key operational parameters such as applied voltage, initial Methylene Blue concentration, treatment time, and pH on the removal efficiency of Methylene Blue. Using Response Surface Methodology in conjunction with Design Expert software, optimal conditions were identified, including a voltage of 15 kV, a Methylene Blue concentration of 20 mg/L, a treatment time of 42.6 min, and a pH of 9, achieving a removal efficiency of 67.54%. Additionally, under specific condition, a maximum RE of 91.7% was achieved. The study demonstrates the efficacy of the cold plasma process in efficiently degrading Methylene Blue dye, offering a scalable and environmentally friendly solution for treating dye-laden wastewater in industrial applications.