Effect of Low Flow Rate of Air Injection on Remazol Red Degradation in Contact Glow Discharge Electrolysis Reactor

摘要

Background and Objective: The plasma electrolysis requires a high amount of energy at the beginning of the process. The purpose of the study was to examine how air injection could reduce the energy of plasma formation. Furthermore, the effect of the flow rate of injected air on hydroxyl radical production and Remazol Red degradation were also studied. Materials and Methods: In this study, the air was injected directly through the glass sheath at the anode in Contact Glow Discharge Electrolysis reactor. Material used were Remazol Red RB-133 200 ppm as synthetic dye waste, Fesup2+/sup 20 ppm as catalyst and Nasub2/subSOsub4/sub 0.02 Mas electrolyte solution. Results: For the same energy input, the higher the flow rate of air injection, the radical hydroxyl concentration increased to an optimum point at a certain flow rate. Moreover, the rate of airflow at optimum condition increased with increasing voltage. An airflow rate of 0.05 L minsup?/supsup1/sup and a voltage of 600 V was the optimum condition. The concentration of hydroxyl radical at this condition produced 19.0849 mmol Lsup?/supsup1/sup after 30 min. Conclusion: This was an increase of 48.43% in comparison with the amount of ?OH where air injection was not used. The presence of air injection also increased the degradation of Remazol Red. Within 5 min, Remazol Red degradation had reached 86.37% at an airflow rate of 0.05 L minsup?/supsup1/sup. This indicated a 53.59% increase compared to the degradation process without air injection.