Department of Civil and Environmental Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea.
Chemosphere. 2020 Nov;259:127382. doi: 10.1016/j.chemosphere.2020.127382. Epub 2020 Jun 17.
We developed a continuous-flow three-dimensional electrode reactor (3DER) to remove ibuprofen (IBP) from water. The effects of the operating parameters on the 3DER performance were investigated. The 3DER was constructed by filling a conventional two-dimensional electrode reactor with granular activated carbon, which acted as particle electrodes. The IBP removal efficiency of the 3DER was 98% in 4 h, which was 2.5 times higher than the removal efficiency for the two-dimensional electrode reactor. IBP removal kinetics tests indicated that the current density (1-20 mA/cm) correlated better than the other operating parameters with the first-order rate constant (k). The flow rate affected the IBP removal kinetics to a small degree. Chloride and sulfate supporting electrolyte concentrations between 17 and 100 mM affected the IBP removal kinetics in opposite ways. Increasing the chloride concentration increased k, but increasing the sulfate concentration decreased k. Radical quenching experiments indicated that much more IBP degradation occurred through both indirect and direct oxidation mechanisms in the 3DER than in the two-dimensional electrode reactor. The particle electrodes caused hydroxyl radicals to form when the 3DER treatment was started, but the particle electrodes later acted as third electrodes and favored direct oxidation of IBP.
我们开发了一种连续流动三维电极反应器（3DER），用于从水中去除布洛芬（IBP）。研究了操作参数对 3DER 性能的影响。3DER 通过在常规二维电极反应器中填充颗粒活性炭来构建，活性炭作为颗粒电极。在 4 小时内，3DER 对 IBP 的去除效率达到 98%，是二维电极反应器去除效率的 2.5 倍。IBP 去除动力学测试表明，电流密度（1-20 mA/cm）比其他操作参数与一级速率常数（k）的相关性更好。流速对 IBP 去除动力学的影响较小。在 17 至 100 mM 之间的氯和硫酸盐支持电解质浓度以相反的方式影响 IBP 去除动力学。增加氯浓度会增加 k，但增加硫酸盐浓度会降低 k。自由基猝灭实验表明，3DER 中的 IBP 降解通过间接和直接氧化机制发生的程度远高于二维电极反应器。当 3DER 处理开始时，颗粒电极会导致羟基自由基的形成，但颗粒电极后来充当第三电极，有利于 IBP 的直接氧化。
