Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application

Sun Hee Yoon; Rand ElShorafa; Mary Katbeh; Dong Suk Han; Hye Won Jeong; Hyunwoong Park; Ahmed Abdel-Wahab

doi:10.1016/j.apsusc.2017.06.147

Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application

Sun Hee Yoon, Rand ElShorafa, Mary Katbeh, Dong Suk Han, Hye Won Jeong, Hyunwoong Park, Ahmed Abdel-Wahab

School of Energy Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

This study investigated the effect of TiO ₂ morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO ₂ particles, nano-granular TiO ₂ particles (TiNP) and TiO ₂ nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO ₂ particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.

Original language	English
Pages (from-to)	71-77
Number of pages	7
Journal	Applied Surface Science
Volume	423
DOIs	https://doi.org/10.1016/j.apsusc.2017.06.147
State	Published - 30 Nov 2017

Keywords

Chromium(VI)
Morphology
Oxygen defect
Titania nanotube
Titanium dioxide

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title = "Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application",

abstract = " This study investigated the effect of TiO 2 morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO 2 particles, nano-granular TiO 2 particles (TiNP) and TiO 2 nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO 2 particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.",

keywords = "Chromium(VI), Morphology, Oxygen defect, Titania nanotube, Titanium dioxide",

author = "Yoon, {Sun Hee} and Rand ElShorafa and Mary Katbeh and Han, {Dong Suk} and Jeong, {Hye Won} and Hyunwoong Park and Ahmed Abdel-Wahab",

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doi = "10.1016/j.apsusc.2017.06.147",

language = "English",

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T1 - Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application

AU - Yoon, Sun Hee

AU - ElShorafa, Rand

AU - Katbeh, Mary

AU - Han, Dong Suk

AU - Jeong, Hye Won

AU - Park, Hyunwoong

AU - Abdel-Wahab, Ahmed

PY - 2017/11/30

Y1 - 2017/11/30

N2 - This study investigated the effect of TiO 2 morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO 2 particles, nano-granular TiO 2 particles (TiNP) and TiO 2 nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO 2 particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.

AB - This study investigated the effect of TiO 2 morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO 2 particles, nano-granular TiO 2 particles (TiNP) and TiO 2 nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO 2 particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.

KW - Chromium(VI)

KW - Morphology

KW - Oxygen defect

KW - Titania nanotube

KW - Titanium dioxide

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DO - 10.1016/j.apsusc.2017.06.147

M3 - Article

AN - SCOPUS:85020865206

SN - 0169-4332

VL - 423

SP - 71

EP - 77

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application

Abstract

Keywords

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