Improving plasma sterilization by constructing a plasma photocatalytic system with a needle array corona discharge and Au plasmonic nanocatalyst  

作　　者：朱斌 李其玮 高亚楠 闫妍 朱益民 徐力 Bin ZHU;Qiwei LI;Yanan GAO;Yan YAN;Yimin ZHU;Li XU(Laboratory of Plasma Catalysis,College of Environmental Sciences and Engineering,Dalian Maritime University,Dalian 116026,People's Republic of China;Novel Energy Materials and Catalysis Research Center,Shanwei Institute of Technology,Shanwei 516600,People's Republic of China)

机构地区：[1]Laboratory of Plasma Catalysis,College of Environmental Sciences and Engineering,Dalian Maritime University,Dalian 116026,People's Republic of China [2]Novel Energy Materials and Catalysis Research Center,Shanwei Institute of Technology,Shanwei 516600,People's Republic of China

出　　处：《Plasma Science and Technology》2023年第1期111-119,共9页等离子体科学和技术（英文版）

基　　金：National Natural Science Foundation of China(Nos.52041001,21808024);Natural Science Foundation of Liaoning Province(No.2020-MS-126);Special Foundation for Key Fields of Colleges and Universities in Guangdong Province(No.2021ZDZX4094)。

摘　　要：Efficient sterilization by a plasma photocatalytic system(PPS)requires strong synergy between plasma and photocatalyst to inactivate microorganisms while suppressing the formation of secondary pollutants.Here,we report that a PPS constructed from a needle array corona discharge and Au/TiO2plasmonic nanocatalyst could remarkably improve the sterilization of Escherichia coli(E.coli)and alleviate formation of the discharge pollutant O3.At 6 kV,the combination of corona discharge and Au/TiO2achieves sterilization efficiency of 100%within an exposure time of 5 min.At 5 kV and an exposure time of 8 min,the presence of Au/TiO2improves sterilization efficiency of the corona discharge from 73%to 91%and reduces the O3concentration from 0.38 to 0.04 ppm,whereas the presence of TiO2reduces the sterilization efficiency and O3concentration to 66%and 0.17 ppm,respectively.The Au/TiO2in the PPS enables a uniform corona discharge,enhances the interaction between plasma,E.coli and nanocatalysts,and suppresses the formation of O3.Further,the Au/TiO2can be excited by ultraviolet-visible light emitted from the plasma to generate electron-hole pairs,and thus contributes to the formation of reactive radicals and the oxidative inactivation of E.coli.The PPS constructed from a needle array corona discharge and Au-based plasmonic nanocatalyst provides a promising approach for developing high-efficiency sterilization techniques.

关 键 词：plasma photocatalysis STERILIZATION corona discharge Au/TiO2 nanocatalyst synergetic effect 

分 类 号：TL631.24[核科学技术—核技术及应用]