Microfluidic Plasma Reactor Rapidly Breaks Down Textile Dye

Researchers at Jiangnan University in China developed a continuous microfluidic plasma reactor that degrades methylene blue, a harmful dye found in textile wastewater. The system uses dielectric barrier discharge plasma within a capillary tube to break down the dye using reactive species like hydroxyl radicals. Tests showed the reactor achieved 99.72% degradation of a 20 mg/L dye solution in under 16 seconds at 5.6 watts.

The degradation process follows a pseudo-first-order model, though higher dye concentrations slightly reduce the reaction rate due to competition for reactive radicals. Mass spectrometry revealed the dye breaks down into simpler organic acids and inorganic ions, demonstrating potential for complete mineralization.

Currently limited to single-capillary operation, the team suggests scaling up the design with multiple channels to increase processing capacity. This technology offers an energy-efficient method for treating persistent organic dyes and could advance continuous water remediation processes.