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Nonthermal Atmospheric Pressure Plasma for Methylene Blue Dye Decolorization by Using Slug Flow Reactor System
Plasma Chemistry and Plasma Processing ( IF 3.6 ) Pub Date : 2020-02-04 , DOI: 10.1007/s11090-020-10066-2
Motoki Yamada , Wahyudiono , Siti Machmudah , Hideki Kanda , Motonobu Goto

Abstract Non-equilibrium pulsed discharge plasma using a gas–liquid slug flow in a glass column as a plasma reactor is developed and applied to methylene blue (MB) dye decolorization in aqueous wastewater. By flowing the solution and gas simultaneously in the slug flow system, the interval of the bubbles could be controlled and adjusted for each flow rate. After the slug flow became steady, an electrical discharge was introduced into the system using an AC power supply with a bipolar pulsed output voltage to generate plasma in the bubbles between the electrodes with a high applied voltage. The decolorization rate of the MB dye was determined by UV–Vis absorption spectroscopy. Based on the experimental results, it was determined that approximately 90% of the MB dye was decolorized for one-time treatment in oxygen and argon in a gaseous phase. This suggests that the oxygen-based reactive species derived from oxygen gas were effective as oxidizing agents, whereas short lifetime OH radicals were mainly produced and decolorized the MB dye in the case of argon and helium gas. Graphic Abstract

中文翻译:

柱塞流反应器系统非热常压等离子体对亚甲基蓝染料脱色

摘要 利用玻璃柱中的气液段塞流作为等离子体反应器开发了非平衡脉冲放电等离子体,并将其应用于水性废水中的亚甲蓝(MB)染料脱色。通过在段塞流系统中同时使溶液和气体流动,可以控制和调整每个流速的气泡间隔。在段塞流稳定后,使用具有双极脉冲输出电压的交流电源将放电引入系统,以在施加高电压的电极之间的气泡中产生等离子体。MB染料的脱色率由紫外-可见吸收光谱法测定。根据实验结果,确定约 90% 的 MB 染料在气相中在氧气和氩气中进行一次处理脱色。这表明源自氧气的氧基活性物质作为氧化剂是有效的,而在氩气和氦气的情况下,主要产生短寿命的 OH 自由基并使 MB 染料脱色。图形摘要
更新日期:2020-02-04
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