Fujian Key Laboratory for Plasma and Magnetic Resonance, School of Physics Science and Technology, Xiamen University, Xiamen 361005, China.
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia.
Sci Rep. 2016 Dec 22;6:39552. doi: 10.1038/srep39552.
Atmospheric-pressure plasma and TiO 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, He and air microplasma arrays, O 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 photocatalytic film to the plasma discharge reactor significantly enhanced the inactivation efficiency of the O 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 photocatalyst in the combined plasma-TiO systems. Present work demonstrated the synergistic effect of the two agents, which can be correlated in order to maximize treatment efficiency.
大气压等离子体和 TiO2 光催化已被广泛研究，分别用于管理和减少水溶液中的微生物。在本文中，这两种方法被结合在一起，以便更深入地了解它们在大肠杆菌污染水消毒中的相互作用。在微等离子体射流阵列进行的水下放电中，大肠杆菌细胞可以迅速失活。失活效率在很大程度上取决于所使用的进料气体、等离子体处理时间和放电功率。与大气压 N、He 和空气微等离子体阵列相比，O 微等离子体在水溶液中对大肠杆菌细胞具有最高的活性，并且在 4 分钟内表现出 >99.9%的细菌失活效率。在等离子体放电反应器中添加 TiO2 光催化薄膜显著提高了 O 微等离子体系统的失活效率，将达到 99.9%大肠杆菌细胞杀灭所需的时间缩短至 1 分钟。这可能归因于 TiO2 光催化剂在组合等离子体-TiO2 系统中的高催化活性和稳定性增强了 ROS 的生成。本工作证明了两种试剂的协同作用，可以对其进行相关分析以最大限度地提高处理效率。
