Research Title |
Evaluating photodegradation properties of Fe–N–TiO2 mesoporous material with anatase/rutile brookite phase mixture under visible light using LED irradiation source |
Date of Distribution |
29 August 2019 |
Conference |
Title of the Conference |
ASIAN Conference on X-ray Absorption Spectroscopy (ACXAS 2019) |
Organiser |
Synchrotron Light Research Institute (Public Organization) |
Conference Place |
Holiday Inn Chiang Mai Hotel |
Province/State |
Chiang Mai, Thailand |
Conference Date |
28 August 2019 |
To |
30 August 2019 |
Proceeding Paper |
Volume |
- |
Issue |
- |
Page |
56 |
Editors/edition/publisher |
Synchrotron Light Research Institute (Public Organization) |
Abstract |
The titanium dioxide photocatalysts co-modified with iron and nitrogen (Fe–N–TiO2) were produced via hydrothermal method. The effects of various dopants concentration were investigated. The characterizations of catalysts such as phase structure, crystallographic orientation, surface morphology, specific surface area, chemical surface composition, charge state and bandgap energy were analyzed by specific techniques. The results showed that the effect of different iron and nitrogen concentrations was significant on the physicochemical properties of the catalysts. The photocatalysts displayed the anatase/rutile/brookite crystal phase mixture. Increasing of rutile and brookite phase compositions was observed with increasing iron content. When increased the nitrogen content, the occurrence of rutile and brookite phases was inhibited and the catalysts displayed the higher content of anatase phase. The high BET surface area was found at high iron and low nitrogen contents. The surface morphology presented the nanorice shape and most of them transformed to spherical shape by increasing the iron content. The bandgap energy of all samples was in the range 2.76-3.15 eV, which appeared lower than undoped TiO2. The state of nitrogen incorporated into TiO2 lattice was demonstrated in an interstitial position (Ti–O–N). The iron incorporated deeper in the structure of TiO2 as Fe2+ and Fe3+ oxidation states, not at the surface as confirmed by XPS and XANES measurements. The photocatalytic activity of antibiotic was performed under visible light using LED illumination source and nearly 70% of antibiotic was removed in 6 h by using the most active sample (2.5%N–1.5%Fe). Additionally, the TiO2 combined with iron and nitrogen dopants improved the charge separation as verified by photoluminescence result. The synergistic effect from the combination of different phases displayed a crucial role in the photocatalytic degradation of antibiotic as well. |
Author |
|
Peer Review Status |
มีผู้ประเมินอิสระ |
Level of Conference |
นานาชาติ |
Type of Proceeding |
Abstract |
Type of Presentation |
Oral |
Part of thesis |
true |
Presentation awarding |
false |
Attach file |
|
Citation |
0
|
|