Nanocrystal TiO2 Engulfed SiO2-Barium Hexaferrite for Enhanced Electrons Mobility and Solar Harvesting Potential

Azrina Abd Aziz; Shaliza Ibrahim; Pichiah Saravanan

doi:10.4028/www.scientific.net/MSF.819.226

Paper Titles

Modeling the Effect of ARC and other Parameters on the Efficiency of GaAs Solar Cell Using Silvaco
p.204

Estimation of Material Damping Coefficients of AlN for Film Bulk Acoustic Wave Resonator
p.209

Thermal Annealing Effect on Properties of Zn Foils Substrates
p.215

Sic-Reinforced Aluminum-Silicon Composite via Pressureless Infiltration Using Polystyrene as External Binder for Electronic Assemblies
p.220

Nanocrystal TiO₂ Engulfed SiO₂-Barium Hexaferrite for Enhanced Electrons Mobility and Solar Harvesting Potential
p.226

Synthesis and Characterisation of Li_1-xNa_xNi_1/3Co_1/3Mn_1/3O₂ as Cathode Materials for Rechargeable Lithium Batteries
p.232

Effects of Compatibilizer on Thermal and Mechanical Properties of PLA/NR Blends
p.241

Compression Test and Energy Absorption of Polyurethane/Multi Walled Carbon Nanotubes Foam Composites
p.246

Crystallinity and Morphological of Cellulose Extraction from Elaeis guineensis Jacquin Frond
p.251

HomeMaterials Science ForumMaterials Science Forum Vol. 819Nanocrystal TiO2 Engulfed SiO2-Barium Hexaferrite...

Nanocrystal TiO₂ Engulfed SiO₂-Barium Hexaferrite for Enhanced Electrons Mobility and Solar Harvesting Potential

Abstract:

Barium hexaferrite embedded-silica-titania photocatalyst (TiO₂-SiO₂-BaFe₁₂O₁₉) was synthesized through sol-gel, liquid catalytic phase transformation and solid reaction routes. The magnetic photocatalyst was aimed to harvest the photoenergy from the sunlight, minimize the electron-holes recombination rate, improve the long lifetime charge-carriers transfer to maximize the photocatalytic activity and enhances the separation and reusability of it. The as-synthesized photocatalyst was characterized and the photocatalytic activity was evaluated for the reduction of 2, 4-dichlorophenol (2, 4-DCP) under direct sunlight. The presence of SiO₂ interlayer in TiO₂-SiO₂-BaFe₁₂O₁₉ prevents the phase transformation of magnetic core. TiO₂-SiO₂-BaFe₁₂O₁₉ benefits the magnetic separation with appreciable magnitude of coercivity (5035.6 Oe) and saturation magnetization (18.8256E^-3 emu/g), respectively. The ferrite ions from the magnetic core which dispersed into TiO₂ matrix exhibited an evident shift of the absorption in the visible region. This was again confirmed with the reduced band gap energy of 1.90 eV. Furthermore, TiO₂-SiO₂-BaFe₁₂O₁₉destructed 100% of 2, 4-DCP compound within 150 min under very bright sunlight with an average irradiance of 820.8 W/m² (results not shown). The embedding of BaFe₁₂O₁₉with a SiO₂layer onto TiO₂nanocrystals contributed for an excellent solar-light utilization and ease magnetic separation of the nanosized photocatalyst.

You might also be interested in these eBooks

International Conference on Functional Materials and Metallurgy (ICoFM 2014)

View Preview

Info:

Periodical:

Materials Science Forum (Volume 819)

Pages:

226-231

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.819.226

Citation:

Cite this paper

Online since:

June 2015

Authors:

Azrina Abd Aziz*, Shaliza Ibrahim, Pichiah Saravanan

Keywords:

Electrons Mobility, Photocatalyst, SiO₂-Barium Hexaferrite, Solar Harvesting, TiO₂

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] Sano, T., Puzenat, E., Guillard, C., Geantat, C., Matsuzawa, S., & Negishi, N. Improvement of Photocatalytic Degradation Activity of Visible-light-responsive TiO2 by Aid of Ultraviolet-light Pretreatment, The Journal of Physical Chemistry C, (2009).

DOI: 10.1021/jp808032y

Google Scholar

[2] Hermann, J.M. Heterogeneous Photocatalysis: State of the Art and Present Applications In honor of Pr. R.L. Burwell Jr. (1912-2003), Former Head of Ipatieff Laboratories, Northwestern University, Evanston (Ill), Topics in Catalysis, (2005).

DOI: 10.1007/s11244-005-3788-2

Google Scholar

[3] Maeda, K., Teramura, K., Lu, D., Takata, T., Saito, N., Inoue, Y., & Domen, K. Photocatalyst Releasing Hydrogen from Water, Nature, (2006), 440 (7082), p.295−296.

DOI: 10.1038/440295a

Google Scholar

[4] Fujishima, A., Honda, K. Electrochemical Photolysis of Water at a Semiconductor Electrode, Nature, (1972), 238 (5358), p.37−38.

DOI: 10.1038/238037a0

Google Scholar

[5] Yang, Y., Zhong, H., & Tian, C. Photocatalytic Mechanisms of Modified Titania under Visible Light, Research on Chemical Intermediates, (2010), 37 (1), p.91−102.

DOI: 10.1007/s11164-010-0232-4

Google Scholar

[6] Friedmann, D., Mendive, C., & Bahnemann, D. TiO2 for Water Treatment: Parameters Affecting the Kinetics and Mechanisms of Photocatalysis, Applied Catalysis B: Environmental, (2010), 99 (3-4), p.398−406.

DOI: 10.1016/j.apcatb.2010.05.014

Google Scholar

[7] Yu, J., Wang, G., Cheng, B., & Zhou, M. Effects of Hydrothermal Temperature and Time on the Photocatalytic Activity and Microstructures of Bimodal Mesoporous TiO2 Powders, Applied Catalysis B: Environmental, (2007), 69 (3-4), p.171−180.

DOI: 10.1016/j.apcatb.2006.06.022

Google Scholar

[8] Xu, S., Shangguan, W., Yuan, J., Chen, M., & Shi, J. Preparations and Photocatalytic Properties of Magnetically Separable Nitrogen-doped TiO2 supported on Nickel Ferrite. Applied Catalysis B: Environment, (2007), 71 (3-4), p.177−184.

DOI: 10.1016/j.apcatb.2006.09.004

Google Scholar

[9] Polshettiwar, V., Varma, R. S. Green Chemistry by Nano-catalysis, Green Chemistry, (2010), 12 (5), p.743−754.

DOI: 10.1039/b921171c

Google Scholar

[10] Shylesh, S., Schünemann, V., & Thiel, W. R. Magnetically Separable Nanocatalysts: Bridges between Homogeneous and Heterogeneous Catalysis, Angewandte Chemie International Edition, (2010), 49 (20), p.3428−3459.

DOI: 10.1002/anie.200905684

Google Scholar

[11] Lu, A. -H., Salabas, E. L., & Schüth, F. Magnetic Nanoparticles: Synthesis, Protection, Functionalization, and Application, Angewandte Chemie International Edition, (2007), 46 (8), p.1222−1244.

DOI: 10.1002/anie.200602866

Google Scholar

[12] Kagotani, T., Fujiwara, D., Sugimoto, S., Inomata, K., & Homma, M. Enhancement of GHz Electromagnetic Wave Absorption Characteristics in Aligned M-type Barium Ferrite Ba1−xLaxZnxFe12−x−y(Me0. 5Mn0. 5)yO19 (x=0. 0–0. 5; y=1. 0–3. 0, Me: Zr, Sn) by Metal Substitution, Journal of Magnetism and Magnetic Materials, (2004).

DOI: 10.1016/j.jmmm.2003.12.878

Google Scholar

[13] Aziz, A. A., Cheng, C. K., Ibrahim, S., Matheswaran, M., & Saravanan, P. Visible Light Improved, Photocatalytic Activity of Magnetically Separable Titania Nanocomposite, Chemical Engineering Journal, (2012), 183, p.349−356.

DOI: 10.1016/j.cej.2012.01.006

Google Scholar