Gas/Liquid Pulsed Discharge Plasma in a Slug Flow Reactor under Pressurized Argon for Dye Decomposition

Area of Science:

• Plasma Science
• Chemical Engineering
• Environmental Chemistry

Background:

• Pulsed discharge plasma in gas/liquid environments offers low energy requirements and high reactivity.
• Previous work established a slug flow system for atmospheric pressure gas/liquid plasma.
• High-pressure plasma research shows promising results.

Purpose of the Study:

• Implement a slug flow system for gas/liquid discharge plasma under pressurized argon.
• Investigate the effect of system pressure (0.1–0.4 MPa) on plasma characteristics and reactivity.
• Apply the pressurized system to methylene blue decomposition and analyze chemical reactivity and energy.

Main Methods:

• Utilized a slug flow system for gas/liquid plasma generation.
• Controlled system pressure from 0.1 MPa (atmospheric) to 0.4 MPa.
• Applied the plasma system to degrade methylene blue and measured oxidation species.

Main Results:

• Methylene blue decomposition rate decreased with increasing system pressure.
• Concentration of total oxidation species increased as system pressure rose.
• Energy available for decomposition decreased due to steady input energy and increased energy loss.

Conclusions:

• System pressure significantly impacts gas/liquid plasma efficiency for pollutant degradation.
• Increased pressure leads to reduced degradation efficiency but higher overall oxidation species generation.
• Optimizing pressure is crucial for effective plasma-based chemical treatment applications.