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Lab. on Chemical Redox Acceleration Technologies for Water Quality
Journal
Effects of Reactive Oxidants Generation and Capacitance on Photoelectrochemical Water Disinfection with Self-doped Titanium Dioxide Nanotube Arrays | |
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Year of publication | 2019 |
Title of paper | Effects of Reactive Oxidants Generation and Capacitance on Photoelectrochemical Water Disinfection with Self-doped Titanium Dioxide Nanotube Arrays |
Author | Kangwoo Cho*, Seonggeun Lee, Hyeonjeong Kim, Hyung-Eun Kim, Aseom Son, Eun-ju Kim, Mengkai Li, Zhimin Qiang, Seok Won Hong* |
Publication in journal | Applied Catalysis B: Environmental |
Status of publication | accepted |
Vol | 257 |
File | Effects of Reactive Oxidants Generation and Capacitance on Photoelectrochemical Water Disinfection with Self-doped Titanium Dioxide Nanotube Arrays.pdf (5.6M) 54회 다운로드 DATE : 2019-07-08 12:25:12 |
Link | https://www.sciencedirect.com/science/article/pii/S0926337319306563 956회 연결 |
We herein provide photoelectrochemical (PEC) disinfection activities of anodically prepared TiO2 nanotube (TNT) arrays (diameter ˜ 100 nm, length ˜ 16.5 μm on average) that were electrochemically self-doped before (bk-TNT) and after (bl-TNT) an atmospheric annealing at 450 °C. The X-ray diffraction indicated predominating anatase TiO2 signal on bl-TNT, while substantial lattice distortion was noticed for bk-TNT. Although the X-ray photoelectron spectra indicated negligible Ti3+ on surface of both TNTs, linear sweep (cyclic) voltammetry and electrochemical impedance spectrometry confirmed the bk-TNT to show greater double layer capacitance and overall photocurrent, coupled with lower charge transfer resistance. Nevertheless, the PEC disinfection of E. coli was significantly invigorated on bl-TNT, while the bactericidal rates in tap water were comparable or even far greater than those in 0.1 M Na2SO4 solutions, depending on [E. coli]0 (105 or 107 CFU/mL). Under a presumed diffusion-controlled kinetic regime in this study, observed effects of capacitance and electrolyte could be interpreted in terms of electrostatic interaction between the electrical double layer of photoanodes and charged bio-solids, such as repulsion by co-ions (SO42-) and adsorption/surface blocking. Analogous PEC experiments on model organic compounds degradation (4-chlorophenol and methylene blue) corroborated a long-term stability of the bl-TNT (up to 30 consecutive cycles) and the role of surface hydroxyl radical as the primary oxidant.
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