Degradation of aniline in aqueous solution using non-thermal plasma generated in microbubbles
Degradation of aniline in aqueous solution using non-thermal plasma generated in microbubbles
复制标题
利用微泡中产生的非热等离子体降解水溶液中的苯胺
DOI：
10.1016/j.cej.2018.01.057
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发表时间：
2018-08-01
影响因子：
15.1
通讯作者：
Li, Pan
中科院分区：
文献类型：
--
作者：
Liu, Yanan;Zhang, Han;Li, Pan
苯胺对人类和水生生物具有致癌性和毒性。为了从水中去除苯胺，通常需要较长的处理时间和添加化学品。在这项研究中，采用介质阻挡放电（DBD）与微泡（MB）相结合的新方法来降解水溶液中的苯胺。 DBD/MB 的苯胺去除率受到输入功率、气泡大小、初始 pH、缓冲溶液的存在和初始电导率的影响。与不使用 MB 的对应工艺相比，DBD/MB 工艺显着增强了苯胺的降解和矿化。使用电子自旋共振和自由基抑制剂叔丁醇将羟基自由基确定为负责苯胺降解的主要活性物质。这项研究表明，DBD/MB组合可以增强等离子体产生的活性物质从气相到液相的溶解和传质，此外，MB在水面下塌陷增加了羟基自由基的产生并促进苯胺降解。因此，采用 MB 来增强 DBD 反应器的反应能力可能有助于开发一种替代方法来降解顽固的化学品，因为它不需要任何化学品剂量。
Aniline is carcinogenic and toxic to human and aquatic life. A long treatment time and the addition of chemicals are usually necessary to remove aniline from water. In this study a novel approach, dielectric barrier discharge (DBD) combined with microbubbles (MBs), was employed to degrade aniline in aqueous solution. The aniline removal rates with DBD/MB were influenced by input power, bubble sizes, initial pH, the existence of a buffer solution, and initial conductivity. Compared to counterpart that did not use MBs, the DBD/MB process significantly enhanced aniline degradation and mineralization. Hydroxyl radicals were identified as the primary active species responsible for aniline degradation used electron spin resonance and the free-radicals inhibitor tertiary-butyl alcohol. This study revealed that the DBD/MB combination could enhance the dissolution and mass transfer of plasma-generated active species from the gas to liquid phase, and furthermore, that MBs collapsed under water surface increased production of hydroxyl radicals and promoted aniline degradation. Thus, employing MBs to enhance the reactive capacity of a DBD reactor may contribute to the development of an alternative method to degrade recalcitrant chemicals since it does not need any dosing with chemicals.