双室介质阻挡放电等离子体反应器降解亚甲基蓝

介质阻挡放电（DBD）等离子体技术可以有效地降解和矿化水中的亚甲基蓝（MB）分子。本文采用一种新型的双室DBD反应器通过处理亚甲基蓝溶液，研究了液体体积、下气室高度、输入功率、初始pH、初始浓度、曝气种类对MB降解的影响。结果表明，在液体体积50 mL、下气室高度7 mm、输入功率18 W、初始pH 4.0、初始浓度100 mg·L-1、氧气曝气时，MB可以在20 min内几乎脱色完全。并提出了MB的降解是脱甲基化、臭氧直接氧化和羟基化共同作用的结果。

Degradation of methylene blue using double-chamber dielectric barrier discharge plasma reactor

Dielectric barrier discharge (DBD) plasma technology is an efficient way to decompose and mineralize aqueous methylene blue (MB). In this paper, a new double-chamber dielectric barrier discharge plasma reactor was designed to degrade MB solution. The influence of the volume of the solution, the height of the lower chamber, initial pH, initial concentration of MB solution, and the gas injected into the reactor on the MB degradation efficiency was also studied. The results proved that MB can be decolorized almost completely in 20 min in the following conditions: a solution volume of 50 mL, a lower chamber height of 7 mm, an input power of 18 W, and oxygen as the working gas. Furthermore, the possible routes of MB abasement and byproduct formation were proposed tentatively. The decomposition of MB may have been a result of the synergistic effects of dealkylation, ozonization, and hydroxylation.