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Enhanced selective photocatalytic oxidation of a bio-derived platform chemical with vacancy-induced core-shell anatase TiO2 nanoparticles

Authors
Jang, Woo-SungPham, Vy NgocYang, Sang-HyeokBaik, JaeyoonLee, HangilKim, Young-Min
Issue Date
1-Mar-2023
Publisher
ELSEVIER
Keywords
TiO2 nanoparticles; Oxygen vacancy; Core-shell structure; Photocatalytic oxidation; 5-hydroxymethlyfurfural (HMF)
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.322, pp 1 - 8
Pages
8
Journal Title
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume
322
Start Page
1
End Page
8
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/151960
DOI
10.1016/j.apcatb.2022.122140
ISSN
0926-3373
1873-3883
Abstract
2,5-Furandicarboxylic acid (FDCA), a biodegradable alternative to fossil fuels, can be obtained via the catalytic oxidation of 2,5-hydroxymethlyfurfural (HMF), which is sourced from biomass. Anatase TiO2 nanoparticles (NPs) with oxygen vacancies (Vo) effectively promote the oxidation process under ultraviolet/visible-light illumination. The conversion process is accelerated by introducing anatase TiO2 NPs with a Vo-densified shell and stoichio-metric core, which is achieved by a simple base treatment after synthesis. The defective shell acts as an electron -rich catalytic platform to facilitate HMF oxidation. Base-treated NPs measuring less than 20 nm yield similar to 40% conversion to FDCA via HMF oxidation at room temperature in water. The photocatalytic activity is achieved at a 580% higher rate than with the corresponding untreated TiO2. Spectroscopic characterizations clearly visualize the densified layer of Vo enclosing the surface of the high-performance TiO2 NPs. Our results provide new in-sights into the optimal defect engineering of oxide-based catalysts for efficient biomass conversions.
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