Nghiên cứu khả năng tạo gốc tự do trong nước bằng công nghệ plasma lạnh

Abstract

This study was conducted to investigate factors that affected the free radicals concentration generated in aqueous solution by cold plasma technology. The factors such as solution flow through electrodes (from 1 to 5 L/min), voltage (from 12 kV to 16 kV), plasma irradiation time (from 10 to 60 min), organic compounds and water types were studied. In addition, the study also investigated the effects of indirect plasma and air flow rate on the free radical concentration. The results showed that the concentration of free radical decreased from 7.57×10-2 to 5.41×10-2 mM when increasing water flow rate from 1 to 5 L/min. Concentration of free radical increased from 6.89×10-2 to 7.77×10-2 mM when increasing the voltage from 12 to16 kV. Experiment data also showed that increasing irradiation time (10 to 60 min) would also increase concentration of free radical (7.52×10-2 to 8.89×10-2 mM). The highest concentration of free radical was obtained at condition of 1 L/min, 16 kV and 60 min irradiation. Furthermore, the study also found that the presence of organic compounds also strongly affected the free radical concentration.