The Photocatalytic Activity of SiO2-TiO2/Graphite and Its Composite with Silver and Silver oxide

*Fitria Rahmawati  -  Research Group of Solid State Chemistry & Catalysis,Chemistry Department, Sebelas Maret University, Jl. Ir. Sutami 36 A, Kentingan, Surakarta 57126, Indonesia
Sayekti Wahyuningsih  -  Research Group of Inorganic Materials, Chemistry Department, Sebelas Maret University, Jl. Ir. Sutami 36 A, Kentingan Surakarta 57126, Indonesia
Dian Irianti  -  Research Group of Solid State Chemistry & Catalysis,Chemistry Department, Sebelas Maret University, Jl. Ir. Sutami 36 A, Kentingan, Surakarta 57126, Indonesia
Received: 1 Sep 2013; Published: 12 Mar 2014.
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Graphical abstract 5374

This research study the mixed semiconductor of SiO2-TiO2 which was immobilized on graphite substrate and also studies the effect of surface modification on its mixed semiconductor. The surface modification was carried out by electrode position of Ag from 0.4 M of AgNO3 solution at various applied current. The electrode position was conducted for 30 minutes at 0.004; 0.008; 0.010; 0.012 and 0.014 A. In the electrode position cell, SiO2-TiO2/Graphite was used as cathode and a graphite rod was used as anode. The weight of deposited Ag was analyzed gravimetrically. The current efficiency of electrode position was calculated by comparing its experimental weight to its theoretical weight founded from calculation using Faraday’s equation for electrolytic cell. Meanwhile, the photo electrochemical testing was carried out to investigate the efficiency of induced photon to current conversion; it was measured as %IPCE (% Induced Photon to Current Efficiency). The crystallinity and crystal structure of the prepared materials were analyzed by X-ray diffraction and their surface morphology was analyzed by Scanning Electron Microscope (SEM). This research found that silver was deposited as silver metal, Ag and as silver oxide, AgO. The electrode position efficiency at applied current of 0.014 A is 92.30 % with diameter of cluster is 7 - 11.9 mm. It is founded that Ag and AgO deposition enhanced the efficiency of photon conversion into current up to 89.92 %. The optimum %IPCE value is at 28.6 % of Ag content. Ag-SiO2-TiO2/G has higher photo conversion than Ag-TiO2/G, shown by the %IPCE value at 300 nm is 83.25 % higher than Ag-TiO2/G. It indicates the significant role of silica network in photo excitation mechanisms in the composite material. © 2014 BCREC UNDIP. All rights reserved

Received: 1st September 2013; Revised: 26th November 2013; Accepted: 7th December 2013

[How to Cite: Rahmawati, F., Wahyuningsih, S., Irianti, D. (2014). The Photocatalytic Activity of SiO2-TiO2/Graphite and Its Composite with Silver and Silver Oxide. Bulletin of Chemical Reaction Engineering & Catalysis, 9 (1): 45-52. (doi:10.9767/bcrec.9.1.5374.45-52)]


Keywords: Ag; photocatalyst; semiconductor; SiO2-TiO2; surface modification
Funding: Directorate General of Higher Education (DIKTI) Republic of Indonesia

Article Metrics:

  1. Van de Krol, R., Goossens, A., Schooman, J. (1997). Spectroscopic investigation of lithium intercalation in thin films of anatase titanium dioxide. Material Research Society Symposium Proceeding, 448: 309-314
  2. Shao, G.N., Elineema, G., Quang, D.V., Kim, Y.N., Shim, Y.H., Hilonga, A., Kim, J-K., Kim,H.T. (2012). Two step synthesis of a mesoporous titania-silica composite from titanium oxychloride and sodium silicate. Powder Technology, 217: 489-496
  3. Demirörs, A.F., van Blaaderen, A., Imhof, A. (2009). Synthesis of Eccentric titania-silica core-shell and composite particles. Chemistry of Materials, 21: 979-984
  4. Zhang, H., Quan, X., Chen, S., Zhao, H. (2006). Fabrication and characterization of silica-titania nanotubes composite membrane with photocatalytic capability. Environmental Science Technology, 40: 6104-6109
  5. Linsebigler, A.L., Lu, G., Yates, J.T. (1995). Photocatalysis on TiO2 surfaces: Principles, Mechanism and Selected Result. Chemical Review, 95: 735-758
  6. Xie, Y. and Yuan, C. (2004). Visible Light Induced Photocatalysis of
  7. Cerium Ion Modified Titania Sol and Nanocrystallites. Journal of Material Science and Technology, 20(1): 14-18
  8. Nugraheni, L.R. (2006). Sintesis Semikonduktor Komposit TiO2-SiO2 menggunakan pelarut Metanol-Isobutanol dan Sensitisasi Komposit dengan Mn(bpy-pts)2Cl2, Master Thesis, Universitas Sebelas Maret, Surakarta, Indonesia
  9. Nasr, C., Kamat, P.V. and Hotchandani, S. (1998). Photoelectrochemistry Composite Semiconductor Thin Films. Photosensitization of the SnO2/TiO2 Coupled System with a Ruthenium Polypyridyl Complex. Journal of Physical Chemistry B., 102: 10047-10056
  10. Li, Y., Hagen, J., Schaffrath, W., Otschik, P. and Haarer, D. (1999). Titanium Dioxide films for photovoltaic cells derived from sol-gel process. Solar Energy Materials and Solar Cells, 56: 167-174
  11. Liu, F., Wang, T., Li, J.Q., Zhao, Y.Q and Zhay, M.C. (2013). Optical and magnetic properties of Co-TiO2 sandwich composite films grown by magnetron sputtering. Con-densed Matter,
  12. Lincot, D., Froment, M. And Cachet, H. (1999). Advance in Electrochemical Science and Engineering, vol. 6, 165, Eds-Wiley-VCH, New York
  13. Rahmawati, F., Kusumaningsih, T. Hapsari, A.M., Hastuti, A. (2010). Ag and Cu loaded on TiO2/Graphite as a catalyst for Escgerichia coli-contaminated water disinfection. Chemical Papers, 64(5): 557-565
  14. Fodor, K., Bitter, J.H., de Jong, K.P. (2002). Investigation of Vapor-Phase Silica deposition on MCM-41 using tetraalkoxysilanes. Microporous and Mesoporous Materials, 56: 101-109
  15. Whang, C.M., Yeo, C.S. and Kim, Y.H. (2001). Preparation and characterization of sol-gel derived SiO2-TiO2-PDMS composite films. Bulletin of Korean Chemical Society, 22(12):1366-1370
  16. Zhou, F., Liang, K., Shao, H. (2005). Study on the cracking of SiO2-TiO2 films prepared by sol-gel method. Materials Science Forum, 475-479: 1227-1230
  17. Nilchi, A., Darzi, S.J., Garmarodi, S.R. (2011). Sol-gel preparation of nanoscale TiO2/SiO2 composite for eliminating of Con Red azo dye. Materials Sciences and Applications, 2: 476-480
  18. Huang, X., Wang, G., Yang, M., Guo, W., Gao, H. (2011). Synthesis of polyaniline - modified Fe3O4/SiO2/TiO2-composite microspheres and their photocatalytic application. Materials Letters, 65: 2887-2890
  19. Wang, H., Zhong, W., Xu, P., Du, Q. (2005). Polyimide/silica/titania nanohybrids via a novel non hydrolytic sol-gel route. Composite: Part A, 36: 909-914
  20. Sato, S., White, J.M. (1980). Photodecomposition of water over Pt/TiO2 catalysts. Chemical Physics Letters, 72: 83-86
  21. Loganathan, K., Bommusamy, P., Muthai-ahpillai, P., Velayutham, M. (2011). The Syntheses, Characterizations, and Photocatalytic Activities of Silver, Platinum, and Gold Doped TiO2 Nanoparticles. Environmental Engineering Research, 16(2): 81-90
  22. Yang, H., Coombs, N., Dag, O., Sokolov, I., Ozin, G.A. (1997). Free standing mesoporous silica films: morphogenesis of channel and surface patterns. Journal of Material Chemistry, 7(9):1755-1761
  23. Hu, S., Li, F., Fan, Z. (2012). Preparation of SiO2-coated TiO2 composite materials with enhanced photocatalytic activity under UV light. Bulletin of Korean Chemical Society, 33(6): 1895-1899

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