In this work, cold plasma jet system and used it to effectively remove Rhodamine B in the solution. We showed that the main oxidation substance responsible to remove Rhodamine B is the hydroxyl radical (•OH). By studying the effects of – the hydrogen peroxide (H2O2) concentration in the initial and later produced in the solution, the plasma power, and the Ar gas flow speed – on the dye remove rate, we identified 2 main reaction pathways to generate hydroxyl radical (•OH). Both of these reaction pathways involved high-energy electrons interacting with water and O2 in the solution and in the ambient air. Our work provided important information to understand the mechanism of dye removal by cold plasma treatment. |
