Yu Han, Zhao Min, Zhang Linus, Dong Heng, Yu Hongbing, Chen Ze
a Research Center for Cleaner Production, College of Environmental Science and Engineering , Nankai University , Tianjin , People's Republic of China.
b Department of Water Resources Engineering , Lund University , Lund , Sweden.
Environ Technol. 2017 Nov;38(22):2907-2915. doi: 10.1080/09593330.2017.1282543. Epub 2017 Feb 3.
The novel double-working-electrode electrochemical system with air diffusion cathode (ADC) and Ti/SnO-Sb anode (TSSA) has shown higher efficiency and lower energy consumption for the degradation of organic pollutant from high-salinity wastewater, compared to the traditional single anode system. To further investigate and improve this system, in this work, firstly the effect of vital factors of the double-working-electrode electrochemical system including initial methyl orange (MO) concentration, NaCl concentration and initial pH value of organic solution were investigated, using MO as the targeted organic pollutant, carbon black ADC (CBAC) as cathode and stainless steel mesh electrode (SSME) as control. Besides, for the further improvement of removal performance, a novel home-made activated carbon-ADC (ACAC) was studied as cathode with the same investigation process. The results showed that, in the experiments studying the effect of both initial MO and NaCl concentrations, the removal performance was in the order of TSSA-ACAC > TSSA-CBAC > TSSA-SSME in all conditions of initial MO and NaCl concentrations. However, with the pH value reduced from 6.0 to 3.0, the performances of three systems turned to be much closer to each other. Besides, ACAC played a synergistic role in MO removal by greatly improving the MO removal performance and enhancing its adaptability to the reactor parametric variation. ACAC created a weak acidic environment for accelerating the indirect electro-oxidation of MO on TSSA. The MO degradation pathways in the three systems were the same but the TSSA-ACAC system gave a higher degradation kinetics order.
与传统单阳极系统相比，新型的带有空气扩散阴极（ADC）和钛基二氧化锡-锑阳极（TSSA）的双工作电极电化学系统在降解高盐度废水中的有机污染物方面表现出更高的效率和更低的能耗。为了进一步研究和改进该系统，在本工作中，首先以甲基橙（MO）为目标有机污染物，炭黑空气扩散阴极（CBAC）为阴极，不锈钢网电极（SSME）作为对照，研究了双工作电极电化学系统的关键因素，包括初始甲基橙（MO）浓度、NaCl浓度和有机溶液的初始pH值的影响。此外，为了进一步提高去除性能，研究了一种新型自制的活性炭空气扩散阴极（ACAC）作为阴极，并采用相同的研究过程。结果表明，在研究初始MO浓度和NaCl浓度影响的实验中，在所有初始MO浓度和NaCl浓度条件下，去除性能顺序为TSSA-ACAC＞TSSA-CBAC＞TSSA-SSME。然而，随着pH值从6.0降至3.0，三种系统的性能变得更加接近。此外，ACAC通过极大地提高MO去除性能并增强其对反应器参数变化的适应性，在MO去除中发挥了协同作用。ACAC创造了一个弱酸性环境，以加速MO在TSSA上的间接电氧化。三种系统中MO的降解途径相同，但TSSA-ACAC系统具有更高的降解动力学级数。
