Plasma re-activation: a promising approach to enhance chemical activity for plasma activated water
Sitao Wang, Zhijie Liu, Bolun Pang, Yuting Gao, Dehui Xu, Dingxin Liu, Michael G. Kong
Abstract
Abstract Plasma activated water (PAW) is a green prospective solution for a wide range of biotechnology applications. However, the drawback for the transient chemical activity of PAW would make it lose versatility in possible applications. Herein, we propose a promising approach for plasma re-activation aimed at enhancing the chemical activity of PAW again before it entirely decays. Our results indicate that the PAW generated by re-activation displays superior physicochemical properties and higher production of RONS. Especially, the concentrations of ONOO − /O 2 − and H 2 O 2 by re-activation can remarkably increase by 17.88% and 34.83% compared to the initial activation, respectively. Furthermore, the low temperature storage shows excellent synergetic effects with re-activation, indicating that the re-activation actually enhances the chemical activity of PAW to a higher level. The possible reasons for high chemical activity of PAW by plasma re-activation may be affected by the synergistic effect of multi-factors including the residual RONS in stored PAW and the lower pH value, temperatures of electrode and liquid during re-activation. This study provides good insight into the nature of liquid chemistry for PAW prepered by plasma re-activation, and demonstrates a new alternative for improving the chemical activity of PAW.