Ar等离子体射流处理乙醇水溶液的放电特性及灭菌效应

doi:10.19595/j.cnki.1000-6753.tces.201227

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摘要乙醇是一种医疗上常用的消毒剂,理论上在Ar等离子体射流处理的水溶液中掺杂乙醇可以增强灭菌效果。通过对耐甲氧西林金黄色葡萄球菌的灭活实验,发现在被处理的水溶液中掺杂20%乙醇可使Ar射流等离子体活化水的灭菌效果提高5个数量级以上。进一步地,发现当工作气体中掺杂0.2%N₂或在屏蔽罩中掺杂1%O₂时,只需在被处理的水溶液中掺杂2%乙醇,即可提高5个数量级以上的灭菌效果。同时发现,2%乙醇掺杂可使等离子体中多个放电通道交叠,原因可能是亚稳态Ar^*和乙醇气体分子在气液界面的彭宁电离作用。最后,通过对液相活性粒子的检测分析,发现等离子体活化乙醇溶液中的过氧乙酸可能在灭菌过程中起主导作用,而过氧亚硝酸和过氧乙酸可能协同作用增强了灭菌效果。

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关键词 ： Ar等离子体射流, 乙醇, 放电特性, 灭菌效应

Abstract：Ethanol is a kind of commonly used disinfectant in medical treatment. Theoretically, doping ethanol into aqueous solution treated by Ar plasma jet can enhance the bactericidal effect. Through the inactivation experiment of Methicillin-resistant Staphylococcus aureus, it was found that the bactericidal effect of Ar jet plasma-activated water was increased by more than 5 orders of magnitude by doping 20% ethanol. Furthermore, when 0.2% N₂ was mixed into the working gas or 1% O₂ was added into the shield, the bactericidal effect can be improved by more than 5 orders of magnitude by doping 2% ethanol. At the same time, 2% ethanol doping can cause the overlapping of multiple discharge channels in the plasma, which may be due to Penning ionization of metastable Ar^* and ethanol gas molecules at the gas-liquid interface. Finally, the analysis of reactive species in liquid phase show that peracetic acid in ethanol solution activated by plasma may play a leading role in the sterilization process, and peroxynitrite and peracetic acid may synergistically enhance the bactericidal effect.

Key words： Ar plasma jet ethanol discharge characteristics bactericidal effect

收稿日期: 2020-09-17

PACS:

TM89

通讯作者: 刘定新男,1982年生,博士,博士生导师,研究方向为大气压冷等离子体技术及其生物医学应用、放电设备故障诊断等。E-mail: liudingxin@mail.xjtu.edu.cn

作者简介: 夏文杰男,1991年生,博士,研究方向为大气压冷等离子体射流及其生物医学应用。E-mail: 690726712@qq.com

引用本文:

夏文杰, 刘定新. Ar等离子体射流处理乙醇水溶液的放电特性及灭菌效应[J]. 电工技术学报, 2021, 36(4): 765-776. Xia Wenjie, Liu Dingxin. Discharge Characteristics and Bactericidal Effect of Ar Plasma Jet Treating Ethanol Aqueous Solution. Transactions of China Electrotechnical Society, 2021, 36(4): 765-776.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201227 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I4/765

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