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Atmospheric-pressure plasma and TiO 2  photocatalysis have been widely investigated separately for the management and reduction of microorganisms in aqueous solutions. In this paper, the two methods were combined in order to achieve a more profound understanding of their interactions in disinfection of water contaminated by  Escherichia coli . Under water discharges carried out by microplasma jet arrays can result in a rapid inactivation of  E. coli  cells. The inactivation efficiency is largely dependent on the feed gases used, the plasma treatment time, and the discharge power. Compared to atmospheric-pressure N 2 , He and air microplasma arrays, O 2  microplasma had the highest activity against  E. coli  cells in aqueous solution, and showed >99.9% bacterial inactivation efficiency within 4 min. Addition of TiO 2  photocatalytic film to the plasma discharge reactor significantly enhanced the inactivation efficiency of the O 2  microplasma system, decreasing the time required to achieve 99.9% killing of  E. coli  cells to 1 min. This may be attributed to the enhancement of ROS generation due to high catalytic activity and stability of the TiO 2  photocatalyst in the combined plasma-TiO 2  systems. Present work demonstrated the synergistic effect of the two agents, which can be correlated in order to maximize treatment efficiency.

Synergistic Effect of Atmospheric-pressure Plasma and TiO2 Photocatalysis on Inactivation of Escherichia coli Cells in Aqueous Media