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In the present work, a process of a selective generation of reactive oxygenspecies (ROS) such as H2O2 and dissolved O3 in plasma-activated water (PAW) isdiscussed. For selective ROS generation, pure CO2 was used as a plasma-forminggas. The gases species present in plasma and properties of PAW are compared indetails when CO2 and air are used as plasma forming gas. The results revealthat PAW (CO2) has significantly higher pH, and low oxidizing potential andelectrical conductivity compared to PAW (air). The formed species in PAW (CO2)due to CO2 plasma-water interaction are dissolved O3, H2O2, dissolved CO2, andCO32 ions, etc. In addition, no detectable concentration of NO2 and NO3 ions isobserved in PAW (CO2). PAW (CO2) has a substantially higher concentration ofH2O2 compared to PAW (air). Moreover, increasing plasma treatment time withwater significantly increases H2O2 and dissolved O3 concentration in PAW (CO2).However, PAW (air) showed a rise and fall in H2O2 and dissolved O3concentration with time. In conclusion, selective generation of ROS in PAW ispossible using CO2 as plasma-forming gas.

Selective generation of reactive oxygen species in plasma activated water using CO2 plasma