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Modification of NiTiO3 visible light-driven photocatalysts by Nb doping and NbOx heterojunction: Oxygen vacancy in the Nb-doped NiTiO3 structure

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Abstract
In this study, two types of niobium-containing NiTiO3 photocatalysts ? Nb-doped NiTiO3 and NbOx/NiTiO3
heterojunction ? were prepared with different Nb contents to enhance photocatalytic activity for dye
photodegradation under sunlight irradiation. Nb-doped NiTiO3 exhibited higher photocatalytic activity than
pure NiTiO3, whereas the heterojunction of NbOx with NiTiO3 caused a decrease in photocatalytic activity.
The incorporation of Nb into the NiTiO3 lattice structure induced the formation of Ti3+ and Nb3+ sites, which
considerably increased the number of oxygen vacancies in those photocatalysts; this conclusion was confirmed by the results of X-ray photoelectron spectroscopy. Eventually, the Nb-doped NiTiO3 photocatalyst at
the highest Nb content (NT-Nb-10) was transformed into a triple metal oxide phase with the highest surface
area and oxygen vacancy. The abundant oxygen vacancy of NT-Nb-10 resulted in the lowest photoluminescence emission intensity, which resulted in the highest apparent photocatalytic reaction rate
constant (kapp) of 14.1 min?1 owing to the suppression of the recombination process. The formation of the
triple metal oxide phase in this study may allow a potential way to modify low cost visible light-driven
NiTiO3 photocatalysts for sustainable photocatalytic application.
Author(s)
다오 득 쾅신은우우홍안웬 티 킴 안장개명정해원Thanh-Truc PhamYong Men
Issued Date
2021
Type
Article
Keyword
NiTiO3 photocatalystNb-dopedNbOx heterojunctionOxygen vacancyTriple metal oxide
DOI
10.1016/j.jallcom.2021.158636
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9230
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_jallcom_2021_158636&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Modification%20of%20NiTiO3%20visible%20light-driven%20photocatalysts%20by%20Nb%20doping%20and%20NbOx%20heterojunction:%20Oxygen%20vacancy%20in%20the%20Nb-doped%20NiTiO3%20structure&offset=0&pcAvailability=true
Publisher
JOURNAL OF ALLOYS AND COMPOUNDS
Location
스위스
Language
영어
ISSN
0925-8388
Citation Volume
861
Citation Number
1
Citation Start Page
158636
Citation End Page
158636
Appears in Collections:
Engineering > Chemical Engineering
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