Details
| Original language | English |
|---|---|
| Pages (from-to) | 147-153 |
| Number of pages | 7 |
| Journal | Separation and Purification Technology |
| Volume | 145 |
| Early online date | 20 Mar 2015 |
| Publication status | Published - 5 May 2015 |
Abstract
Mesoporous Al 2O 3-TiO 2 nanocomposites at different Al 2O 3 contents (0-5 wt.%) have been synthesized through a facile sol-gel method using tetrabutyl orthotitanateand and aluminum-tri-sec-butoxide as a precursors for TiO 2 and Al 2O 3 sources. XRD and Raman spectra confirmed that highly crystalline anatase TiO 2 phase was formed at low Al 2O 3 content; however, the produced Al 2O 3-TiO 2 nanocomposites are amorphous phase at 3 and 5 wt.% Al 2O 3. TEM images show TiO 2 particles are quite uniform with 10 ± 2 nm sizes with mesoporous structure. The surface area of mesoporous TiO 2 was increased from 174 m 2/g to 325 m 2/g by increasing Al 2O 3 contents from 0% to 5%. The photocatalytic efficiencies of Al 2O 3-TiO 2 nanocomposites were evaluated by photodegradation of herbicide imazapyr compared with UV-100 under UV illumination. The photocatalytic efficiency of 2 wt.% Al 2O 3-TiO 2 nanocomposite is significantly 2 and 3-fold higher than that of mesoporous TiO 2 and UV-100, respectively. 2 wt.% Al 2O 3-TiO 2 is considered to be the optimum photocatalyst for the highest photonic efficiency ∼4%. The superiority of 2 wt.% Al 2O 3-TiO 2 nanocomposite is explained by the highly crystalline and small particles sizes with mesoporous structure. The proposed mechanism of this system and the role of amorphous Al 2O 3 are explained by details.
Keywords
- Al O -TiO, Degradation, Imazapyr, Mesoporous, Photocatalyst
ASJC Scopus subject areas
- Chemistry(all)
- Analytical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Separation and Purification Technology, Vol. 145, 05.05.2015, p. 147-153.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photocatalytic degradation of imazapyr using mesoporous Al2O3–TiO2 nanocomposites
AU - Ismail, A.A.
AU - Abdelfattah, I.
AU - Atitar, M.F.
AU - Robben, L.
AU - Bouzid, H.
AU - Al-Sayari, S.A.
AU - Bahnemann, D.W.
N1 - Funding information: I.A. thanks the Egyptian Ministry of Higher Education for providing him a Postdoctoral fellowship. Advanced Materials and NanoResearch Centre, Najran University, Najran, Saudi Arabia has been gratefully acknowledged for instrumental facility. A.A. I. acknowledges the Alexander von Humboldt (AvH) Foundation for granting him a research fellowship.
PY - 2015/5/5
Y1 - 2015/5/5
N2 - Mesoporous Al 2O 3-TiO 2 nanocomposites at different Al 2O 3 contents (0-5 wt.%) have been synthesized through a facile sol-gel method using tetrabutyl orthotitanateand and aluminum-tri-sec-butoxide as a precursors for TiO 2 and Al 2O 3 sources. XRD and Raman spectra confirmed that highly crystalline anatase TiO 2 phase was formed at low Al 2O 3 content; however, the produced Al 2O 3-TiO 2 nanocomposites are amorphous phase at 3 and 5 wt.% Al 2O 3. TEM images show TiO 2 particles are quite uniform with 10 ± 2 nm sizes with mesoporous structure. The surface area of mesoporous TiO 2 was increased from 174 m 2/g to 325 m 2/g by increasing Al 2O 3 contents from 0% to 5%. The photocatalytic efficiencies of Al 2O 3-TiO 2 nanocomposites were evaluated by photodegradation of herbicide imazapyr compared with UV-100 under UV illumination. The photocatalytic efficiency of 2 wt.% Al 2O 3-TiO 2 nanocomposite is significantly 2 and 3-fold higher than that of mesoporous TiO 2 and UV-100, respectively. 2 wt.% Al 2O 3-TiO 2 is considered to be the optimum photocatalyst for the highest photonic efficiency ∼4%. The superiority of 2 wt.% Al 2O 3-TiO 2 nanocomposite is explained by the highly crystalline and small particles sizes with mesoporous structure. The proposed mechanism of this system and the role of amorphous Al 2O 3 are explained by details.
AB - Mesoporous Al 2O 3-TiO 2 nanocomposites at different Al 2O 3 contents (0-5 wt.%) have been synthesized through a facile sol-gel method using tetrabutyl orthotitanateand and aluminum-tri-sec-butoxide as a precursors for TiO 2 and Al 2O 3 sources. XRD and Raman spectra confirmed that highly crystalline anatase TiO 2 phase was formed at low Al 2O 3 content; however, the produced Al 2O 3-TiO 2 nanocomposites are amorphous phase at 3 and 5 wt.% Al 2O 3. TEM images show TiO 2 particles are quite uniform with 10 ± 2 nm sizes with mesoporous structure. The surface area of mesoporous TiO 2 was increased from 174 m 2/g to 325 m 2/g by increasing Al 2O 3 contents from 0% to 5%. The photocatalytic efficiencies of Al 2O 3-TiO 2 nanocomposites were evaluated by photodegradation of herbicide imazapyr compared with UV-100 under UV illumination. The photocatalytic efficiency of 2 wt.% Al 2O 3-TiO 2 nanocomposite is significantly 2 and 3-fold higher than that of mesoporous TiO 2 and UV-100, respectively. 2 wt.% Al 2O 3-TiO 2 is considered to be the optimum photocatalyst for the highest photonic efficiency ∼4%. The superiority of 2 wt.% Al 2O 3-TiO 2 nanocomposite is explained by the highly crystalline and small particles sizes with mesoporous structure. The proposed mechanism of this system and the role of amorphous Al 2O 3 are explained by details.
KW - Al O -TiO
KW - Degradation
KW - Imazapyr
KW - Mesoporous
KW - Photocatalyst
UR - http://www.scopus.com/inward/record.url?scp=84925834579&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2015.03.012
DO - 10.1016/j.seppur.2015.03.012
M3 - Article
VL - 145
SP - 147
EP - 153
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
ER -