Details
| Original language | English |
|---|---|
| Pages (from-to) | 63-71 |
| Number of pages | 9 |
| Journal | Catalysis Today |
| Volume | 313 |
| Early online date | 8 Dec 2017 |
| Publication status | Published - 1 Sept 2018 |
Abstract
Regardless of the fact that tungsten trioxide (WO 3) is recognized as one of the most promising photocatalysts for potential activity under visible light illumination, it still suffers from intrinsic drawbacks such as photocorrision and an unsuitable band gap structure for the reduction of molecular oxygen. To overcome these limitations we herein report for the first time in-situ synthesized WO 3 nanoparticles which were coupled with commercial TiO 2 (P25) via a simple impregnation method. The surface of the composites were additionally grafted with varying contents (0.005–0.3 wt%) of Fe(III) nanoclusters with their synergistic performance being investigated. The photocatalytic activities of the obtained materials were evaluated by monitoring the decomposition of the model compounds nitric oxide (NO) and acetaldehyde under UV and visible light illumination. A significant improvement of visible light sensitivity was attained in comparison with bare WO 3/TiO 2. Additionally the synthesized photocatalysts have been characterized by using x-ray powder diffraction(XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy, UV–vis diffuse reflectance spectroscopy and N 2 adsorption (BET) for specific surface area determination. The EPR results confirmed a direct charge transfer from the VB of the composites to the surface grafted Fe(III) nanoclusters, which are promoting multi-electron reduction processes consequently resulting in the degradation of harmful gases.
Keywords
- Acetaldehyde, IFCT, Photocatalysts, Visible light activity, WO /TiO
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
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In: Catalysis Today, Vol. 313, 01.09.2018, p. 63-71.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Surface-grafted WO3/TiO2 photocatalysts
T2 - Enhanced visible-light activity towards indoor air purification
AU - Balayeva, Narmina O.
AU - Fleisch, Manuel
AU - Bahnemann, Detlef W.
N1 - Publisher Copyright: © 2017 Elsevier B.V. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - Regardless of the fact that tungsten trioxide (WO 3) is recognized as one of the most promising photocatalysts for potential activity under visible light illumination, it still suffers from intrinsic drawbacks such as photocorrision and an unsuitable band gap structure for the reduction of molecular oxygen. To overcome these limitations we herein report for the first time in-situ synthesized WO 3 nanoparticles which were coupled with commercial TiO 2 (P25) via a simple impregnation method. The surface of the composites were additionally grafted with varying contents (0.005–0.3 wt%) of Fe(III) nanoclusters with their synergistic performance being investigated. The photocatalytic activities of the obtained materials were evaluated by monitoring the decomposition of the model compounds nitric oxide (NO) and acetaldehyde under UV and visible light illumination. A significant improvement of visible light sensitivity was attained in comparison with bare WO 3/TiO 2. Additionally the synthesized photocatalysts have been characterized by using x-ray powder diffraction(XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy, UV–vis diffuse reflectance spectroscopy and N 2 adsorption (BET) for specific surface area determination. The EPR results confirmed a direct charge transfer from the VB of the composites to the surface grafted Fe(III) nanoclusters, which are promoting multi-electron reduction processes consequently resulting in the degradation of harmful gases.
AB - Regardless of the fact that tungsten trioxide (WO 3) is recognized as one of the most promising photocatalysts for potential activity under visible light illumination, it still suffers from intrinsic drawbacks such as photocorrision and an unsuitable band gap structure for the reduction of molecular oxygen. To overcome these limitations we herein report for the first time in-situ synthesized WO 3 nanoparticles which were coupled with commercial TiO 2 (P25) via a simple impregnation method. The surface of the composites were additionally grafted with varying contents (0.005–0.3 wt%) of Fe(III) nanoclusters with their synergistic performance being investigated. The photocatalytic activities of the obtained materials were evaluated by monitoring the decomposition of the model compounds nitric oxide (NO) and acetaldehyde under UV and visible light illumination. A significant improvement of visible light sensitivity was attained in comparison with bare WO 3/TiO 2. Additionally the synthesized photocatalysts have been characterized by using x-ray powder diffraction(XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy, UV–vis diffuse reflectance spectroscopy and N 2 adsorption (BET) for specific surface area determination. The EPR results confirmed a direct charge transfer from the VB of the composites to the surface grafted Fe(III) nanoclusters, which are promoting multi-electron reduction processes consequently resulting in the degradation of harmful gases.
KW - Acetaldehyde
KW - IFCT
KW - Photocatalysts
KW - Visible light activity
KW - WO /TiO
UR - http://www.scopus.com/inward/record.url?scp=85039045014&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2017.12.008
DO - 10.1016/j.cattod.2017.12.008
M3 - Article
VL - 313
SP - 63
EP - 71
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
ER -