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Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays
Cho, Kangwoo; Lee, Seonggeun; Kim, Hyeonjeong; Kim, Hyung-Eun; Son, Aseom; Kim, Eun-ju; Li, Mengkai; Qiang, Zhimin; Hong, Seok Won
2019-11-15
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume257Pages:-
AbstractWe herein provide photoelectrochemical (PEC) disinfection activities of anodically prepared TiO2 nanotube (TNT) arrays (diameter (similar to)100 nm, length (similar to)16 mu m on average) that were electrochemically self-doped before (bk-TNT) and after (bl-TNT) an atmospheric annealing at 450 degrees 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) (10(5) or 10(7) 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.
Department环境水质学国家重点实验室
KeywordCapacitance Disinfection Electrochemical self-doping Reactive oxidants TiO2
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42641
Collection环境水质学国家重点实验室
Affiliation1.Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 790784, South Korea
2.Korea Inst Sci & Technol, Water Cycle Res Ctr, Hwarangro 14 Gil, Seoul 02792, South Korea
3.Chinese Acad Sci, Univ Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Cho, Kangwoo,Lee, Seonggeun,Kim, Hyeonjeong,et al. Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,257:-.
APA Cho, Kangwoo.,Lee, Seonggeun.,Kim, Hyeonjeong.,Kim, Hyung-Eun.,Son, Aseom.,...&Hong, Seok Won.(2019).Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays.APPLIED CATALYSIS B-ENVIRONMENTAL,257,-.
MLA Cho, Kangwoo,et al."Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays".APPLIED CATALYSIS B-ENVIRONMENTAL 257(2019):-.
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