Tuning the photocatalytic selectivity of TiO2 anatase nanoplates by altering the exposed crystal facets content
Loading...
Date
Authors
Sofianou, M. V.
Psycharis, V.
Boukos, N.
Vaimakis, T.
Yu, J. G.
Dillert, R.
Bahnemann, D.
Trapalis, C.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Type
Type of the conference item
Journal type
peer reviewed
Educational material type
Conference Name
Journal name
Applied Catalysis B-Environmental
Book name
Book series
Book edition
Alternative title / Subtitle
Description
TiO2 anatase nanoplates were fabricated by a solvothermal method using titanium isopropoxide as a titanium precursor and HF as a capping agent in order to enhance the formation of the {0 0 1} crystal facets of the anatase crystal. Two different surface modification procedures were applied in order to remove the adsorbed fluoride anions on the {0 0 1} crystal facets of the nanoplates. The first procedure was by calcining the as-prepared TiO2 anatase nanoplates up to 600 degrees C and the second one was by washing them with a NaOH aqueous solution. Importantly, the surface modification procedure leads to the formation of two different morphologies of the TiO2 anatase nanoplates which exhibited tunable photocatalytic selectivity in air pollutants purification. The calcined nanoplates became larger and their {1 0 1} crystal facets expanded by shrinking the {0 0 1} crystal facets. In contrast the washed nanoplates maintained their shape which was formed by the solvothermal method. All samples that were calcined or washed, exhibited high photonic efficiency for air pollutants oxidation. The calcined TiO2 anatase nanoplates exhibited the best photocatalytic activity in oxidizing the NO gas to NO2 and NO3- whereas the washed TiO2 anatase nanoplates, preserving the initial morphology, exhibited the best photocatalytic activity in decomposing acetaldehyde. The dominant exposed {1 0 1) or {0 0 1} crystal facets of the TiO2 anatase nanoplates is the key factor in tuning the adsorption selectivity of the air pollutants. (c) 2013 Elsevier B.V. All rights reserved.
Description
Keywords
tio2 nanoplates, {101} {001} facets, photoctalysis, no oxidation, acetaldehyde decomposition, dominant 001 facets, gaseous acetaldehyde, rietveld analysis, water-adsorption, diffraction data, degradation, oxidation, surfaces, size, air
Subject classification
Citation
Link
<Go to ISI>://000324077600086
http://ac.els-cdn.com/S0926337313003925/1-s2.0-S0926337313003925-main.pdf?_tid=3b4be686-5356-11e3-8763-00000aacb360&acdnat=1385111737_c7cad1cf1c305f0692a12920dd4662ed
http://ac.els-cdn.com/S0926337313003925/1-s2.0-S0926337313003925-main.pdf?_tid=3b4be686-5356-11e3-8763-00000aacb360&acdnat=1385111737_c7cad1cf1c305f0692a12920dd4662ed
Language
en
Publishing department/division
Advisor name
Examining committee
General Description / Additional Comments
Institution and School/Department of submitter
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας