The Influence of the Au Nanoparticles Dimension on the Photocatalytic Performances of TiO_2-Au Porous Composites

• Authors: G. Melinte , M. Baia , D. Georgescu , L. Baia , V. Iancu , L. Diamandescu , T. Popescu , L. Cotet , L. Barbu-Tudoran , V. Danciu , S. Simon
• Languages of publication: EN

Abstracts

EN

The influence of Au nanoparticles dimension on the photocatalytic performances of the TiO_2 aerogels-Au composites was evaluated. Structural and morphological peculiarities of the TiO_2 aerogel, unloaded and loaded with 5 and 22 nm Au nanoparticles, were studied by transmission electron microscopy technique, X-ray diffraction and N_2-sorption measurements. UV-Vis diffuse reflectance measurements were performed to determine the band gap energies. The photocatalytic activity was evaluated by monitoring the salicylic acid photodegradation. It was found that the Au nanoparticles promote the anatase phase crystallization and produce the decrease of the specific surface area and band gap energy values. The porous composite with the smallest Au nanoparticles dimension exhibits the best photocatalytic performances.

Keywords

EN

81.05.Rm; 81.07.Wx; 82.80.Ej; 68.37.Lp; 82.65.+r; 82.50.Hp

Discipline

• 68.37.Lp: Transmission electron microscopy (TEM)
• 82.50.Hp: Processes caused by visible and UV light
• 82.80.Ej: X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
• 81.07.Wx: Nanopowders
• 81.05.Rm: Porous materials; granular materials(for granular superconductors, see 74.81.Bd)
• 82.65.+r: Surface and interface chemistry; heterogeneous catalysis at surfaces(for temporal and spatial patterns in surface reactions, see 82.40.Np; see also 82.45.Jn Surface structure, reactivity and catalysis in electrochemistry; see also 68.43.-h Chemisorption/physisorption: adsorbates on surfaces)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 1
• Pages: 208-210

Dates

published

2012-01

Contributors

author

G. Melinte

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

author

M. Baia

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

author

D. Georgescu

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

author

L. Baia

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

author

V. Iancu

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

author

L. Diamandescu

• National Institute of Materials Physics, Atomistilor 105 bis, P.O. Box MG. 7, 77125 Bucharest, Romania

author

T. Popescu

• National Institute of Materials Physics, Atomistilor 105 bis, P.O. Box MG. 7, 77125 Bucharest, Romania

author

L. Cotet

• Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, A. Janos 11, 400028 Cluj-Napoca, Romania

author

L. Barbu-Tudoran

• Faculty of Biology and Geology, Babes-Bolyai University, Clinicilor 5-7, 400006 Cluj-Napoca, Romania

author

V. Danciu

• Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, A. Janos 11, 400028 Cluj-Napoca, Romania

author

S. Simon

• Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

References

• 1. D. Beydoun, R. Amal, G. Low, S. McEvoy, Nanoparticle Res. 1, 439 (1999)
• 2. N. Hüsing, U. Schubert, Angew. Chem. Int. Ed. 37, 22 (1998)
• 3. V. Subramanian, E.E. Wolf, P.V. Kamat, J. Am. Chem. Soc. 126, 4943 (2004)
• 4. S. Sakthivel, M.V. Shankar, M. Palanichamy, B. Arabindoo, D.W. Bahnemann, V. Murugesan, Water Res. 38, 3001 (2004)
• 5. U. Cernigoj, U. Lavrencic-Stangar, P. Tresbe, U.O. Krasovec, S. Gross, Thin Solid Films 495, 327 (2006)
• 6. A.M. Luis, M.C. Neves, M.H. Mendonca, O.C. Monteiro, Mater. Chem. Phys. 125, 20 (2011)
• 7. H. Li, G. Zhao, Z. Chen, B. Song, G. Han, J. Am. Ceram. Soc. 93, 445 (2010)
• 8. L. Baia, L. Diamandescu, L. Barbu-Tudoran, A. Peter, G. Melinte, V. Danciu, M. Baia, J. Alloys Comp. 509, 2672 (2011)
• 9. H. Liu, L. Zhang, N.A. Seaton, Chem. Eng. Sci. 47, 4393 (1992)

Identifiers

DOI

10.12693/APhysPolA.121.208