Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-24T23:13:31.788Z Has data issue: false hasContentIssue false
  • English
  • Français

Immobilization and photocatalytic efficiency of titania nanoparticles on silica carrier spheres

Published online by Cambridge University Press:  03 March 2011

Cheng-Yu Kuo  and
Shih-Yuan Lu
Cheng-Yu Kuo
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu 30043, Taiwan, Republic of China
Shih-Yuan Lu*
Affiliation:
Department of Chemical Engineering, National Tsing-Hua University, Hsin-Chu 30043, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Immobilization of titania nanoparticles on submicron-sized silica carrier spheres was achieved, and the relevant photocatalytic efficiency was studied. In contrast to the commonly adopted practice of either free suspending nano-sized catalyst particles or immobilized catalyst particles on large supports for photocatalytic applications, the present approach offers a third option, avoiding the disadvantages of the above-mentioned two practices. In the model system of photo-degradation of methylene blue, the photocatalytic efficiency of the present catalyst form was found comparable to that of free-suspending P25 nanoparticles, a popular commercial titania photocatalyst, of the same total catalyst surface area. The present photocatalytic process was found to be diffusion dominant, and its impressive catalytic performance was attributed to the well-separated, smaller than usual titania particles immobilized on the surfaces of submicron-sized silica spheres.

Keywords

CatalyticCoatingColloid
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2290 - 2297
Copyright
Copyright © Materials Research Society 2006

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Lee, D.K. and Cho, I.C.: Characterization of TiO2 thin film immobilized on glass tube and its application to PCE photocatalytic destruction. Microchem. J. 68, 215 (2001).CrossRefGoogle Scholar
2Lee, J.M., Kim, M.S., and Kim, B.W.: Photodegradation of bisphenol-A with TiO2 immobilized on the glass tubes including the UV light lamps. Water Res. 38, 3605 (2004).CrossRefGoogle ScholarPubMed
3Rao, K. Venkata Subba, Rachel, A., Subrahmanyam, M., and Boule, P.: Immobilization of TiO2 on pumice stone for the photocatalytic degradation of dyes and dye industry pollutants. Appl. Catal., B: Environ. 46, 77 (2003).Google Scholar
4Pozzo, R.L., Giombi, J.L., Baltanás, M.L., and Cassano, A.E.: The performance in a fluidized bed reactor of photocatalysts immobilized onto inert supports. Catal. Today 62, 175 (2000).CrossRefGoogle Scholar
5Noorjahan, M., Reddy, M.P. Pratab, Kumari, V. Durga, Lavédrine, B., Boule, P., and Subrahmanyam, M.: Photocatalytic degradation of H-acid over a novel TiO2 thin film fixed bed reactor and in aqueous suspensions. J. Photochem. Photobiol., A: Chem. 156, 179 (2003).CrossRefGoogle Scholar
6Zertal, A., Molnár-Gábor, D., Malouki, M.A., Sehili, T., and Boule, P.: Photocatalytic transformation of 4-chloro-2-methylphenoxyacetic acid (MCPA) on several kinds of TiO2. Appl. Catal., B: Environ. 49, 83 (2004).CrossRefGoogle Scholar
7Xu, N.P., Shi, Z.F., Fan, Y.Q., Dong, J., Shi, J., and Hu, M.Z.C.: Effects of particle size of TiO2 on photocatalytic degradation of methylene blue in aqueous suspensions. Ind. Eng. Chem. Res. 38, 373 (1999).CrossRefGoogle Scholar
8Kim, H-J., Shul, Y-G., and Han, H.S.: Photocatalytic properties of silica-supported TiO2. Top. Catal. 35, 287 (2005).CrossRefGoogle Scholar
9Dagan, G., Sampath, S., and Lev, O.: Preparation and utilization of organically modified silica-titania photocatalysts for decontamination of aquatic environments. Chem. Mater. 7, 446 (1995).CrossRefGoogle Scholar
10Anderson, C. and Bard, A.J.: Improved photocatalyst of TiO2/SiO2 prepared by a sol-gel synthesis. J. Phys. Chem. 99, 9882 (1995).CrossRefGoogle Scholar
11Fu, X., Clark, L.A., Yang, Q., and Anderson, M.A.: Enhanced photocatalytic performance of titania-based binary metal oxides: TiO2/SiO2 and TiO2/ZrO2. Environ. Sci. Technol. 30, 647 (1996).CrossRefGoogle Scholar
12Anderson, C. and Bard, A.J.: Improved photocatalytic activity and characterization of mixed TiO2/SiO2 and TiO2/Al2O3 materials. J. Phys. Chem. B 101, 2611 (1997).CrossRefGoogle Scholar
13Gao, X.T. and Wachs, I.E.: Titania-silica as catalysts: Molecular structural characteristics and physico-chemical properties. Catal. Today 51, 233 (1999).CrossRefGoogle Scholar
14Stober, W., Fink, A., and Bohn, E.: Controlled growth of monodisperse silica spheres in the micron size range. J. Colloid Interface Sci. 26, 62 (1968).CrossRefGoogle Scholar
15Jiang, X.C., Herricks, T., and Xia, Y.N.: Monodispersed spherical colloids of titania: Synthesis, characterization, and crystallization. Adv. Mater. 15, 1205 (2003).CrossRefGoogle Scholar
16 Natl. Bur. Stand. (U.S.) Monogr. 25, 7 (1969).Google Scholar
17Chen, G.C., Kuo, C.Y., and Lu, S.Y.: A general process for preparation of core-shell particles of complete and smooth shells. J. Am. Ceram. Soc. 88, 277 (2005).CrossRefGoogle Scholar
18Lu, S.Y. and Yen, Y.M.: Overall rate constants for diffusion and incorporation in clusters of spheres. J. Chem. Phys. 116, 3128 (2002).CrossRefGoogle Scholar
19Lu, S.Y.: Patch size effect on diffusion and incorporation in dilute suspension of partially active spheres. J. Chem. Phys. 120, 3997 (2004).CrossRefGoogle ScholarPubMed
20Wu, J-C. and Lu, S-Y.: Patch-distribution effect on diffusion-limited process in dilute suspension of partially active spheres. J. Chem. Phys. 124, 24911 (2006).CrossRefGoogle ScholarPubMed