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TiO2 nanotube electrode for organic degradation coupled with flow-electrode capacitive deionization for brackish water desalination
npj Clean Water ( IF 11.4 ) Pub Date : 2022-03-04 , DOI: 10.1038/s41545-022-00150-9
Jihun Lim 1 , Yong-Uk Shin 1 , Aseom Son 1, 2 , Seungkwan Hong 1 , Seok Won Hong 2
Affiliation  

A photoelectrochemical (PEC) oxidation and flow-electrode capacitive deionization (FCDI) dual system was explored for the effective treatment of brackish water. Two anodic electrodes with electrochemically self-doped TiO2 arrays (blue-mesh/ blue-plate TiO2 nanotube arrays (BM-TNA & BP-TNA)) were fabricated by annealing at 600 °C, and applied for the treatment of a water system. Specifically, the BM-TNA confirmed lower electrical resistance and superior performance under multiple light source (UV-A, -B, and -C). Furthermore, the system generated powerful oxidizing reactive oxygen species (ROS), which were assessed via degradation of eight organic pollutants: bisphenol-A, 4-chlorophenol, cimetidine, sulfamethoxazole, benzoic acid, phenol, nitrobenzene, and acetaminophen. Decomposition efficiency was stable throughout a wide range of pH, and durability of the BM-TNA electrode was demonstrated through long-term operation. Concurrently, optimization of the FCDI process via key operational parameters (electrode mass loading, and applied voltage) achieved superior desalination performance, and specific energy consumption (SEC). In particular, increased mass loading enhanced charge transportation through the formation of stable charge-percolation pathways, leading to improved solution conductance. Finally, the feasibility of the dual system (PEC-FCDI) was verified through complete degradation of the organic substrates and successful desalination of the brackish water.



中文翻译:

用于有机物降解的 TiO2 纳米管电极结合流动电极电容去离子用于苦咸水淡化

探索了一种光电化学(PEC)氧化和流动电极电容去离子(FCDI)双系统用于有效处理微咸水。两个带有电化学自掺杂 TiO 2阵列的阳极电极(蓝网/蓝板 TiO 2纳米管阵列(BM-TNA 和 BP-TNA))通过在 600 °C 下退火制造,并应用于水系统的处理。具体而言,BM-TNA 证实了在多光源(UV-A、-B 和 -C)下具有更低的电阻和卓越的性能。此外,该系统产生了强大的氧化活性氧(ROS),通过降解八种有机污染物进行评估:双酚A、4-氯苯酚、西咪替丁、磺胺甲恶唑、苯甲酸、苯酚、硝基苯和对乙酰氨基酚。分解效率在很宽的 pH 范围内保持稳定,BM-TNA 电极的耐用性通过长期运行得到证明。同时,通过关键操作参数(电极质量负载和施加电压)优化 FCDI 工艺,实现了卓越的脱盐性能,和比能耗(SEC)。特别是,增加的质量负载通过形成稳定的电荷-渗透路径来增强电荷传输,从而提高溶液的电导率。最后,通过有机底物的完全降解和微咸水的成功脱盐验证了双系统(PEC-FCDI)的可行性。

更新日期:2022-03-04
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