Lim, Jihun Shin, Yong-Uk Son, Aseom Hong, Seok Won Hong, Seungkwan 2024-01-19T12:31:59Z 2024-01-19T12:31:59Z 2022-04-05 2022-03 https://pubs.kist.re.kr/handle/201004/115558 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 degrees 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. English NATURE PORTFOLIO TiO2 nanotube electrode for organic degradation coupled with flow-electrode capacitive deionization for brackish water desalination Article 10.1038/s41545-022-00150-9 1 npj Clean Water, v.5, no.1 npj Clean Water 5 1 Y scie scopus 000764708000001 2-s2.0-85126150474 Engineering, Chemical Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article NITRATE REMOVAL SURFACE-WATER NANOFILTRATION ENERGY OXIDATION GROUNDWATER PERFORMANCE