College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China.
Environ Technol. 2020 Jun;41(16):2140-2145. doi: 10.1080/09593330.2018.1556349. Epub 2019 Jan 22.
Aqueous solution absorptions are widely used as an effective way for the treatment of noxious gases discharged from various industrial processes. However, this technology may encounter problems in removing gaseous pollutants with low Henry constants, such as styrene from contaminated air. In this study, a novel electrochemical absorption reactor was devised to remove these air pollutants. The reactor consists of five pairs of stacked mesh electrodes. Each pair of mesh electrodes consists of a Ti/RuO anode and a Ti cathode. The dimension of mesh electrode is 100 mm × 100 mm with 3 mm × 5 mm rhombic holes evenly distributed. The distance between two neighbouring electrodes is 25 mm. The simulated gas was introduced into the reactor from the bottom of the reactor by a gas distributor. The experimental result shows that styrene in the air was effectively removed by the electrochemical absorption reactor, and the removal increased with the increase of current density applied to the reactor. It was found that almost 100% styrene removal was achieved in 1% NaCl solution with 1 pH value and a current density of 0.04 A/cm applied to the reactor. The major liquid phase products from styrene oxidation were confirmed to be 1-Phenyl-1, 2-ethanediol and benzaldehyde.
水溶液吸收广泛应用于处理各种工业过程排放的有害气体的有效方法。然而，该技术在去除亨利常数较低的气态污染物时可能会遇到问题，例如空气中的苯乙烯。在这项研究中，设计了一种新型电化学吸收反应器来去除这些空气污染物。该反应器由五对堆叠的网电极组成。每对网电极由 Ti/RuO2 阳极和 Ti 阴极组成。网电极的尺寸为 100 mm×100 mm，带有均匀分布的 3 mm×5 mm 的菱形孔。两个相邻电极之间的距离为 25 mm。模拟气体通过气体分布器从反应器底部进入反应器。实验结果表明，电化学吸收反应器能有效去除空气中的苯乙烯，去除率随施加到反应器的电流密度的增加而增加。在 1%NaCl 溶液中，pH 值为 1，施加到反应器的电流密度为 0.04 A/cm 时，苯乙烯的去除率达到近 100%。苯乙烯氧化的主要液相产物被确认为 1-苯基-1,2-乙二醇和苯甲醛。
