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Title: Enhanced Photocatalytic Activity of TiO 2 Nanoparticles Supported on Electrically Polarized Hydroxyapatite

Fast recombination of photogenerated charge carriers in titanium dioxide (TiO 2) remains a challenging issue, limiting the photocatalytic activity. This study demonstrates here increased photocatalytic performance of TiO 2 nanoparticles supported on electrically polarized hydroxyapatite (HA) films. Dense and thermally stable yttrium and fluorine co-doped HA films with giant internal polarization were synthesized as photocatalyst supports. TiO 2 nanoparticles deposited on the support were then used to catalyze the photochemical reduction of aqueous silver ions to produce silver nanoparticles. It was found that significantly more silver nanoparticles were produced on polarized HA supports than on depolarized HA supports. In addition, the photodegradation of methyl orange with TiO 2 nanoparticles on polarized HA supports was found to be much faster than with TiO 2 nanoparticles on depolarized HA supports. It is proposed that separation of photogenerated electrons and holes in TiO nanoparticles is promoted by the internal polarization of the HA support, and consequently, the recombination of charge carriers is mitigated. The results imply that materials with large internal polarization can be used in strategies for enhancing quantum efficiency of photocatalysts.
Authors:
 [1] ; ORCiD logo [2]
  1. Univ. of Rochester, NY (United States). Dept. of Chemical Engineering
  2. Univ. of Rochester, NY (United States). Dept. of Chemical Engineering. Lab. for Laser Energetics
Publication Date:
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 20; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
Univ. of Rochester, NY (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; hydroxyapatite; methyl orange; photocatalysis; polarization; silver; titania
OSTI Identifier:
1494562

Zhang, Xuefei, and Yates, Matthew Z. Enhanced Photocatalytic Activity of TiO2 Nanoparticles Supported on Electrically Polarized Hydroxyapatite. United States: N. p., Web. doi:10.1021/acsami.8b03838.
Zhang, Xuefei, & Yates, Matthew Z. Enhanced Photocatalytic Activity of TiO2 Nanoparticles Supported on Electrically Polarized Hydroxyapatite. United States. doi:10.1021/acsami.8b03838.
Zhang, Xuefei, and Yates, Matthew Z. 2018. "Enhanced Photocatalytic Activity of TiO2 Nanoparticles Supported on Electrically Polarized Hydroxyapatite". United States. doi:10.1021/acsami.8b03838.
@article{osti_1494562,
title = {Enhanced Photocatalytic Activity of TiO2 Nanoparticles Supported on Electrically Polarized Hydroxyapatite},
author = {Zhang, Xuefei and Yates, Matthew Z.},
abstractNote = {Fast recombination of photogenerated charge carriers in titanium dioxide (TiO2) remains a challenging issue, limiting the photocatalytic activity. This study demonstrates here increased photocatalytic performance of TiO2 nanoparticles supported on electrically polarized hydroxyapatite (HA) films. Dense and thermally stable yttrium and fluorine co-doped HA films with giant internal polarization were synthesized as photocatalyst supports. TiO2 nanoparticles deposited on the support were then used to catalyze the photochemical reduction of aqueous silver ions to produce silver nanoparticles. It was found that significantly more silver nanoparticles were produced on polarized HA supports than on depolarized HA supports. In addition, the photodegradation of methyl orange with TiO2 nanoparticles on polarized HA supports was found to be much faster than with TiO2 nanoparticles on depolarized HA supports. It is proposed that separation of photogenerated electrons and holes in TiO nanoparticles is promoted by the internal polarization of the HA support, and consequently, the recombination of charge carriers is mitigated. The results imply that materials with large internal polarization can be used in strategies for enhancing quantum efficiency of photocatalysts.},
doi = {10.1021/acsami.8b03838},
journal = {ACS Applied Materials and Interfaces},
number = 20,
volume = 10,
place = {United States},
year = {2018},
month = {4}
}