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Unprecedented porosity transformation of hierarchically porous TiO2 derived from Ti-Oxo clusters

Title
Unprecedented porosity transformation of hierarchically porous TiO2 derived from Ti-Oxo clusters
Authors
Park, SeonghunLee, JieunKim, BongkyumYuan, DaqiangChen, Ying-PinPark, Jinhee
DGIST Authors
Park, Jinhee
Issue Date
2020-06
Citation
Microporous and Mesoporous Materials, 300, 110153
Type
Article
Article Type
Article
Author Keywords
TiO2Hierarchically porous materialsPorosity transformationPhotocatalystsReactive oxygen species
Keywords
TITANIUM-DIOXIDE NANOMATERIALSHIGH SURFACE-AREASMESOPOROUS TIO2BLACK TIO2PHOTOCATALYSISOXIDEACIDCRYSTALLIZATIONGENERATIONREACTIVITY
ISSN
1387-1811
Abstract
Although attaining a high porosity in TiO2 is critical to enhancing its photocatalytic and photoelectric activities, its synthesis has been challenging owing to the high reactivity of conventional Ti precursors and the laborious template removal process. Thus, we herein report a versatile method for preparing hierarchically porous organic-functionalized TiO2 (HiPOTs) using Ti-oxo clusters consisting of a rigid reactive ligand, para-aminobenzoate (p-ABA). The presence of p-ABA as a structure-directing template is crucial to obtain microporous structures with sufficiently high yields. The HiPOTs gradually transform from hierarchically micro/mesoporous structures into mesoporous structures during a sol–gel process. The Brunauer–Emmett–Teller surface areas of the HiPOTs range from 242 to 739 m2/g, which are among the highest reported for porous TiO2 materials. The presence of p-ABA on the HiPOT surface decreases the band gap of TiO2 to 2.7 eV, and prolonging the sol–gel process releases greater quantities of p-ABA, thereby increasing the band gap and the crystallinity of the anatase phase. Interestingly, unlike conventional TiO2, which experiences rapid charge recombination, the Ti3+ oxidation states of HiPOTs are successfully isolated during UV irradiation and can be applied as a proof of concept to generate reactive oxygen species such as 1O2 and •O2 −. © 2020
URI
http://hdl.handle.net/20.500.11750/11878
DOI
10.1016/j.micromeso.2020.110153
Publisher
Elsevier BV
Related Researcher
  • Author Park, Jinhee Organic-Inorganic Hybrids Lab
  • Research Interests Organic-Inorganic Hybrid Materials; Metal-Organic Polyheda;Metal-Organic Frameworks; Porous Polymer Networks
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceOrganic-Inorganic Hybrids Lab1. Journal Articles


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