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Micelle-assisted synthesis of Al2O3·CaO nanocatalyst: optical properties and their applications in photodegradation of 2,4,6-trinitrophenol.

Imtiaz A, Farrukh MA, Khaleeq-ur-rahman M, Adnan R - ScientificWorldJournal (2013)

Bottom Line: The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO.The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques.The direct optical band gap of the Al2O3·CaO nanocatalyst was found as 3.3 eV.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, GC University Lahore, 54000 Lahore, Pakistan.

ABSTRACT
Calcium oxide (CaO) nanoparticles are known to exhibit unique property due to their high adsorption capacity and good catalytic activity. In this work the CaO nanocatalysts were prepared by hydrothermal method using anionic surfactant, sodium dodecyl sulphate (SDS), as a templating agent. The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO. The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques. The catalytic efficiencies of these nanocatalysts were studied for the photodegradation of 2,4,6-trinitrophenol (2,4,6-TNP), which is an industrial pollutant, spectrophotometrically. The effect of surfactant and temperature on size of nanocatalysts was also studied. The smallest particle size and highest percentage of degradation were observed at critical micelle concentration of the surfactant. The direct optical band gap of the Al2O3·CaO nanocatalyst was found as 3.3 eV.

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ln⁡α versus hν for determination of the localized tail state Ee.
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Related In: Results  -  Collection


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fig7: ln⁡α versus hν for determination of the localized tail state Ee.

Mentions: Using Urbach's equation (3), the density of the localized tail state (Ee = 1.87 eV) in the forbidden energy gap was determined by plotting ln⁡α versus hν as shown in Figure 7:(3)α=α0ehν/Ee.


Micelle-assisted synthesis of Al2O3·CaO nanocatalyst: optical properties and their applications in photodegradation of 2,4,6-trinitrophenol.

Imtiaz A, Farrukh MA, Khaleeq-ur-rahman M, Adnan R - ScientificWorldJournal (2013)

ln⁡α versus hν for determination of the localized tail state Ee.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3842055&req=5

fig7: ln⁡α versus hν for determination of the localized tail state Ee.
Mentions: Using Urbach's equation (3), the density of the localized tail state (Ee = 1.87 eV) in the forbidden energy gap was determined by plotting ln⁡α versus hν as shown in Figure 7:(3)α=α0ehν/Ee.

Bottom Line: The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO.The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques.The direct optical band gap of the Al2O3·CaO nanocatalyst was found as 3.3 eV.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, GC University Lahore, 54000 Lahore, Pakistan.

ABSTRACT
Calcium oxide (CaO) nanoparticles are known to exhibit unique property due to their high adsorption capacity and good catalytic activity. In this work the CaO nanocatalysts were prepared by hydrothermal method using anionic surfactant, sodium dodecyl sulphate (SDS), as a templating agent. The as-synthesized nanocatalysts were further used as substrate for the synthesis of alumina doped calcium oxide (Al2O3·CaO) nanocatalysts via deposition-precipitation method at the isoelectric point of CaO. The Al2O3·CaO nanocatalysts were characterized by FTIR, XRD, TGA, TEM, and FESEM techniques. The catalytic efficiencies of these nanocatalysts were studied for the photodegradation of 2,4,6-trinitrophenol (2,4,6-TNP), which is an industrial pollutant, spectrophotometrically. The effect of surfactant and temperature on size of nanocatalysts was also studied. The smallest particle size and highest percentage of degradation were observed at critical micelle concentration of the surfactant. The direct optical band gap of the Al2O3·CaO nanocatalyst was found as 3.3 eV.

Show MeSH
Related in: MedlinePlus