School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Chemosphere. 2022 Nov;307(Pt 1):135541. doi: 10.1016/j.chemosphere.2022.135541. Epub 2022 Jun 30.
The method of enhancing mass transfer and improving reaction efficiency by confinement has attracted much attention in the electrochemical research field. In this research, to make low diffusion-limited electrochemical reactors fieldable, a new electrochemical reactor in flow-through mode was established with the mass-produced Ti/RuO-IrO felt fibers as the electrodes. The effects of voltage, current, and electrode thickness were explored in this study. When the flow mode was switched from flow-by to flow-through, the single-pass degradation effect of rhodamine B rose from 4.4% to 74.8% under the same operating conditions. Meanwhile, a mass transfer model was established based on the results of removal efficiency and electrode channel parameters. The model was in good agreement with the new electrode parameters verification (R > 0.970). With this model, it could derive specific results on the effect of pore size change on the treatment effect. The impact of enhancing mass transfer by confining the pore sizes is most clearly gained at a certain range (less than 100 μm). Furthermore, a pilot-scale electrochemical reactor in flow-through mode was built, and excellent performance was shown in the treatment of actual waste leachate. The removal efficiencies of total nitrogen, ammonia, and nitrate were 80.9%, 88.6%, and 64.5% in 30 min, respectively. It will be a promising technology with good prospect.
通过限制来增强传质和提高反应效率的方法在电化学研究领域引起了广泛关注。在这项研究中，为了使低扩散限制的电化学反应器可行，使用批量生产的 Ti/RuO-IrO 毡纤维作为电极，建立了一种新的在流通模式下工作的电化学反应器。本研究探讨了电压、电流和电极厚度的影响。当流动模式从旁通切换为流通时，在相同的操作条件下，罗丹明 B 的单通降解效果从 4.4%提高到 74.8%。同时，根据去除效率和电极通道参数的结果建立了传质模型。该模型与新电极参数验证（R＞0.970）吻合良好。利用该模型，可以推导出孔径变化对处理效果的具体影响。在一定范围内（小于 100μm），通过限制孔径来增强传质的效果最为明显。此外，还构建了一种流通模式的中试规模电化学反应器，在实际渗滤液处理中表现出优异的性能。在 30 分钟内，总氮、氨和硝酸盐的去除效率分别达到 80.9%、88.6%和 64.5%。这将是一种具有广阔前景的很有前途的技术。
