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Postillumination Activity in a Single-Phase Photocatalyst of Mo-Doped TiO2 Nanotube Array from Its Photocatalytic "Memory"
Feng, F; Yang, WY; Gao, S; Sun, CX; Li, Q; Li, Q (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Environm Funct Mat Div, Shenyang 110016, Peoples R China.
2018-05-01
Source PublicationACS SUSTAINABLE CHEMISTRY & ENGINEERING
ISSN2168-0485
Volume6Issue:5Pages:6166-6174
AbstractSeveral composite photocatalysts with photo catalytic "memory" effect had recently been developed, which could possess postillumination activity for an extended period of time in the dark for many potential applications. Here, a single-phase photocatalyst of Mo-doped TiO2 nanotube array was developed for the first time with the postillumination photocatalytic memory effect, which could eliminate the requirement of building composite photocatalysts with heterojunctions and largely broaden the material selection for this interesting photocatalytic memory effect. Because of the proper electronic band gap structure and variable valences of Mo dopants, photogenerated electrons could transfer from TiO2 to Mo dopants and be trapped there by reducing Mo6+ to Mo5+ under UV irradiation. When UV irradiation was switched off, these trapped electrons could be released from Mo dopants and react with O-2 through the two -electron O-2 reduction process to produce H2O2 in the dark. Thus, Mo-doped TiO2 nanotube array could remain active in the dark as demonstrated by its effective disinfection of Escherichia coli cells when UV irradiation was turned off. This work demonstrated that photocatalysts with postillumination photocatalytic memory effect were not limited to composite photocatalysts with heterojunctions. Various single-phase photocatalysts could also possess this interesting photocatalytic memory effect through doping metal elements with variable valences.; Several composite photocatalysts with photo catalytic "memory" effect had recently been developed, which could possess postillumination activity for an extended period of time in the dark for many potential applications. Here, a single-phase photocatalyst of Mo-doped TiO2 nanotube array was developed for the first time with the postillumination photocatalytic memory effect, which could eliminate the requirement of building composite photocatalysts with heterojunctions and largely broaden the material selection for this interesting photocatalytic memory effect. Because of the proper electronic band gap structure and variable valences of Mo dopants, photogenerated electrons could transfer from TiO2 to Mo dopants and be trapped there by reducing Mo6+ to Mo5+ under UV irradiation. When UV irradiation was switched off, these trapped electrons could be released from Mo dopants and react with O-2 through the two -electron O-2 reduction process to produce H2O2 in the dark. Thus, Mo-doped TiO2 nanotube array could remain active in the dark as demonstrated by its effective disinfection of Escherichia coli cells when UV irradiation was turned off. This work demonstrated that photocatalysts with postillumination photocatalytic memory effect were not limited to composite photocatalysts with heterojunctions. Various single-phase photocatalysts could also possess this interesting photocatalytic memory effect through doping metal elements with variable valences.
description.department[feng, fan ; yang, weiyi ; li, qi] chinese acad sci, shenyang natl lab mat sci, inst met res, environm funct mat div, shenyang 110016, peoples r china ; [feng, fan] univ chinese acad sci, beijing 100049, peoples r china ; [gao, shuang] tsinghua univ, grad sch shenzhen, div energy & environm, shenzhen 518055, peoples r china ; [sun, caixia] qingdao binhai univ, key lab new metall funct mat & adv surface engn u, qingdao 266555, peoples r china ; [sun, caixia] qingdao binhai univ, sch mech & elect engn, qingdao 266555, peoples r china
KeywordIllumination Catalytic Memory Visible-light Illumination Water-treatment Technology Electronic-structure Oh Radicals Oxide Degradation Oxidation Nitrogen Films
Subject AreaChemistry, Multidisciplinary ; Green & Sustainable Science & Technology ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China [51672283, 51602316]; Basic Science Innovation Program of Shenyang National Laboratory for Materials Science [Y4N56R1161, Y5N56F2161]; Natural Science Foundation of Shandong Province, P.R China [ZR2017MEM017]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79316
Collection中国科学院金属研究所
Corresponding AuthorLi, Q (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Environm Funct Mat Div, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Feng, F,Yang, WY,Gao, S,et al. Postillumination Activity in a Single-Phase Photocatalyst of Mo-Doped TiO2 Nanotube Array from Its Photocatalytic "Memory"[J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2018,6(5):6166-6174.
APA Feng, F,Yang, WY,Gao, S,Sun, CX,Li, Q,&Li, Q .(2018).Postillumination Activity in a Single-Phase Photocatalyst of Mo-Doped TiO2 Nanotube Array from Its Photocatalytic "Memory".ACS SUSTAINABLE CHEMISTRY & ENGINEERING,6(5),6166-6174.
MLA Feng, F,et al."Postillumination Activity in a Single-Phase Photocatalyst of Mo-Doped TiO2 Nanotube Array from Its Photocatalytic "Memory"".ACS SUSTAINABLE CHEMISTRY & ENGINEERING 6.5(2018):6166-6174.
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