Three modes of a direct-current plasma jet operated underwater to degrade methylene blue

作     者：Xuechen LI Biao WANG Pengying JIA Linwei YANG Yaru LI Jingdi CHU 李雪辰;王彪;贾鹏英;杨林伟;李亚茹;楚婧娣

作者机构：College of Physics Science and TechnologyHebei UniversityBaoding 071002People's Republic of China Key Laboratory of Photo-Electronics Information Materials of Hebei ProvinceBaoding 071002People's Republic of China 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2017年第19卷第11期

页      面：75-81页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：sponsored by National Natural Science Foundation of China under Grant Nos.11575050 and 10805013 One Hundred Talent Project of Hebei Province under GrantNo.SLRC2017021 the Midwest Universities Comprehensive Strength Promotion Project the Natural Science Foundation of Hebei province,China,under Grant Nos.A2015201092,A2016201042 and A2015201199 the Research Foundation of Education Bureau of Hebei province,China,under Grant No.LJRC011 the 333 Talents Project of Hebei province,China,under Grant No.A2016005005 

主　　题：plasma jet direct current glow discharge plasma degradation methylene blue 

摘      要：A direct-current air plasma jet operated underwater presents three stable modes including an intermittently-pulsed discharge, a periodically-pulsed discharge and a continuous discharge with increasing the power voltage. The three discharge modes have different appearances for the plasma plumes. Moreover, gap voltage-current characteristics indicate that the continuous discharge is in a normal glow regime. Spectral lines from reactive species（OH, N2, N2^＋, Hα,and O） have been revealed in the emission spectrum of the plasma jet operated *** intensities emitted from OH radical and oxygen atom increase with increasing the power voltage or the gas flow rate, indicating that reactive species are abundant. These reactive species cause the degradation of the methylene blue dye in solution. Effects of the experimental parameters such as the power voltage, the gas flow rate and the treatment time are investigated on the degradation efficiency. Results indicate that the degradation efficiency increases with increasing the power voltage, the gas flow rate or the treatment time. Compared with degradation in the intermittently-pulsed mode or the periodically-pulsed one, it is more efficient in the continuous mode, reaching 98% after 21 min treatment.