Effects of reactive oxidants generation and capacitance on photoelectrochemical water disinfection with self-doped titanium dioxide nanotube arrays

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	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
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2019-11-15
卷号	257 页码:-
关键词	Capacitance Disinfection Electrochemical self-doping Reactive oxidants TiO2
ISSN号	0926-3373
英文摘要	We 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.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42641]
专题	生态环境研究中心_环境水质学国家重点实验室
作者单位	1.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
推荐引用方式 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):-.