Export file:


  • RIS(for EndNote,Reference Manager,ProCite)
  • BibTex
  • Text


  • Citation Only
  • Citation and Abstract

Antibacterial activities of gel-derived Ag-TiO2-SiO2 nanomaterials under different light irradiation

1 Institute for Environmental and Resource, 142 To Hien Thanh street, District 10, Hochiminh city, Vietnam
2 Faculty of Chemical & Food Technology, Hochiminh City University of Technology and Education, 01 Vo Van Ngan street, Thu Duc district, Hochiminh city, Vietnam
3 Faculty of Environment, Hochiminh City University of Technology, 268 Ly Thuong Kiet street, District 10, Hochiminh city, Vietnam

Special Issues: Nanomaterials for energy and environmental applications

Gel-derived Ag-TiO2-SiO2 nanomaterials were prepared by sol-gel process to determine their disinfection efficiency under UV-C, UV-A, solar irradiations and in dark condition. The surface morphology and properties of gel-derived Ag-TiO2-SiO2 nanomaterials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET specific surface area. The results showed that the average particle size of Ag-TiO2-SiO2 was around 10.9–16.3 nm. SiO2 mixed with TiO2 (the weight ratio of Si to Ti = 10:90) in the synthesis of Ag-TiO2-SiO2 by sol-gel process was found to increase the specific surface area of the obtained photocatalyst (164.5 m2g−1) as compared with that of commercial TiO2(P25) (53.1 m2g−1). Meanwhile, Ag doped in TiO2 (the mole ratio of Ag to TiO2 = 1%) decreased the specific surface area to 147.3 m2g−1. The antibacterial activities of gel-derived Ag-TiO2-SiO2 nanomaterials were evaluated by photocatalytic reaction against Escherichia coli bacteria (ATCC®25922). Ag-TiO2-SiO2 nanomaterials was observed to achieve higher disinfection efficiency than the catalyst without silver since both Ag nanoparticles and ions exhibit a strong antibacterial activity and promoted the e – h+ separation of TiO2. The bactericidal activity of Ag-TiO2-SiO2 nanomaterial under light irradiation was superior to that under dark and only light. The reaction time to achieve a reduction by 6 log of bacteria of UV-C light alone and Ag-TiO2-SiO2 with UV-C light irradiation were 30 and 5 minutes, respectively. In addition, the superior synergistic effect of Ag-TiO2-SiO2 under both UV-A and solar light as compared to that under UV-C counterpart could be ascribed to the red-shift of the absorbance spectrum of the Ag doped TiO2-based catalyst.
  Article Metrics

Keywords gel-derived Ag-TiO2-SiO2; photocatalyst; E.coli inactivation; different light irradiation

Citation: Nhung Thi-Tuyet Hoang, Anh Thi-Kim Tran, Nguyen Van Suc, The-Vinh Nguyen. Antibacterial activities of gel-derived Ag-TiO2-SiO2 nanomaterials under different light irradiation. AIMS Materials Science, 2016, 3(2): 339-348. doi: 10.3934/matersci.2016.2.339


  • 1. Hoffman MR, Martin ST, Choi W, et al. (1995) Environmental application of semiconductor photocatalysis. Chem Rev 95: 69–96.    
  • 2. Robertson P (1996) Semiconductor photocatalysis: An environmentally acceptable alternative production technique and efluent treament process. J Cleaner Prod 4: 203–212.
  • 3. Matsunga T, Tamada R, Wake H (1985) Photoelectrochemical sterilization of microbial-cells by semiconductor powders. FEMS Microbiol Lett 29: 211–214.    
  • 4. Rengaraj S, Li XZ (2006) Enhanced photocatalytic activity of TiO2 by doping with Ag for degradation of 2,4,6-trichlorophenol in Aqueous Suspension. J Mol Cataltsis A 243: 60–67.    
  • 5. Katsumata H, Sada M, Nakaoka Y, et al. (2009) Photocatalytic degradation of diuron in aqueous solutions of platinized TiO2. J Hazard Mater 171: 1081–1087.    
  • 6. Kalathil S, Khan MM, Banerjee AN, et al. (2012) A simple biogenic route to rapid synthesis of Au@TiO2 nanocomposites by electrochemically active biofilms. J Nanoparticle Res 14: 1051–1059.    
  • 7. Fang J, Cao S-W, Wang Z, et al. (2012) Mesoporous plasmonic Au–TiO2 nanocomposites for efficient visible-light-driven photocatalytic water reduction. Int J Hydrogen Energy 37: 17853–17861.
  • 8. Yu C, Cai D, Yang K, et al. (2010) Sol- gel derived S, I-codoped mesoporous TiO2 photocatalyst with high visible-light photocatalytic activity. J Phys Chem Solids 71: 1337–1343.    
  • 9. Yuranova T, Rincon AG, Bozzi A, et al. (2003) Antibacterial textiles prepared by RF-plasma and vacuum-UV mediated deposition of silver. J Photochem Photobiol 161: 27–34.
  • 10. Grieken RV, Marugán J, Sordo C, et al. (2009) Photocatalytic inactivation of bacteria in water using suspended and immobilized silver-TiO2. Environmental 93: 112–118.
  • 11. Sangchaya W, Sikonga L, Kooptarnond K (2012) Comparison of photocatalytic reaction of commercial P25 and synthetic TiO2-AgCl nanoparticles. Procedia Eng 32: 590–596.    
  • 12. Ubonchonlakate K, Sikong L, Tontai T, et al. (2011) P. aeruginosa Inactivation with silver and nickel doped TiO2 films coated on glass fibre roving. Adv Mater Res 150–151: 1726–1731.
  • 13. Cho KH, Park JE, Osaka T, et al. (2005) The study of antimicrobial activity and preservative effects of nanosilver ingredient. Electrochim Acta 51: 956–960.    
  • 14. Akhavan O, Ghaderi E (2009) Enhancement of antibacterial properties of Ag nanorods by electric field. Sci Technol Adv Mater 10: 015003.
  • 15. Li M, Noriega-Trevino ME, Nino-Martinez N, et al. (2011) Synergistic Bactericidal Activity of Ag-TiO2 nanoparticles in Both Light and Dark Conditions. Environ Sci Technol 45: 8989–8995.    
  • 16. Thiel J, Pakstis L, Buzby S, et al. (2007) Antibacterial properties of silver-doped. Small 3: 799–803.    
  • 17. Scafani A, Palmisano L, Schiavello M (1990) Influence of the preparation methods of titanium dioxide on the photocatalytic degradation of phenol in aqueous dispersion. J Phys Chem 94: 829–832.    
  • 18. Viet-Cuong N, The-Vinh N (2009) Photocatalytic decomposition of phenol over N-TiO2-SiO2 catalyst under natural sunlight. J ExpNanosci 4: 233–242.
  • 19. Hoang T-TN, Suc NV, Nguyen T-V (2015) Bactericidal activities and synergistic effects of Ag–TiO2 and Ag–TiO2–SiO2 nanomaterials under UV-C and dark conditions. Int J Nanotechnol 12: 367–379.    
  • 20. Sun B, Sun S-Q, Li T, et al. (2007) Preparation and antibacterial activities of Ag-doped SiO2–TiO2 composite films by liquid phase deposition (LPD) method. J Mater Sci 42: 10085–10089.    
  • 21. Chao HE, Yuan YU, Xingfanga HU (2003) Effect of silver doping on the phase transformation and grain growth of sol-gel titania powder. J Eur Ceramic Soci 23: 1457–1464.    
  • 22. Oliveri G, Ramis G, Busca G, et al. (1993) Thermal stability of vanadia-titania cataysts. J Mater Chem 3: 1239–1249.    
  • 23. Shahverdi AR, Fakhimi A, Shahverdi HR, et al. (2007) Synthesis and effect of silver nanoparticles on the antibacterial activity of different antibiotics against Staphylococcus aureus and Escherichia coli. Nanomedicine 3: 168–171.
  • 24. Smetana AB, Klabunde KJ, Marchin GR, et al. (2008) Biocidal activity of nanocrystalline silver powders and particles. Langmuir 24: 7457–7464.    
  • 25. Yamanaka M, Hara K, Kudo J (2005) Bactericidal actions of a silver ion solution on Escherichia coli, studied by energy-filtering transmission electron microscopy and proteomic analysis. Appl Environ Microbiol 71: 7589–7593.    
  • 26. Benabbou AK, Derriche Z, Felix C, et al. (2007) Photocatalytic inactivation of Escherischia coli. Effect of concentration of TiO2 and microorganism, nature, and intensity of UV irradiation. Appl Catal B Environ 76: 257–263.
  • 27. Hassan Y, Ishtiaq AQ, Imran H, et al. (2013) Visible light photocatalytic water disinfection and its kinetics using Ag-doped titania nanoparticles. Environ Sci Pollut Res 21: 740–752.
  • 28. Anpo M, Kishiguchi S, Ichihashi Y, et al. (2001) The design and development of second-generation titanium oxide photocatalysts able to operate under visible light irradiation by applying a metal ion-implantation method. Res Chem Intermediat 27: 459–467.    
  • 29. Chen X, Lou Y, Samia ACS, et al. (2003) Coherency Strain Effects on the Optical Response of Core/Shell Heteronanostructures. Nano Lett 3: 799–803.
  • 30. Park CH, Zhang SB, Wei SH (2002) Origin ofp-type doping difficulty in ZnO: The impurity perspective. Phys Rev 66: 073202.    
  • 31. Choi W, Termin A, Hoffmann M (1994) The Role of Metal Ion Dopants in Quantum-Sized TiO2: Correlation between Photoreactivity and Charge Carrier Recombination Dynamics. J Phys Chem 98: 13669–13679.
  • 32. Mu W, Herrmann JM, Pichat P (1989) Room temperature photocatalytic oxidation of liquid cyclohexane into cyclohexanone over neat and modified TiO2. Catal Lett 3: 73–84.    
  • 33. Duonghong D, Borgarello E, Gratzel M (1981) Dynamics of light-induced water cleavage in colloidal systems. J Am Chem Soc 103: 4685–4690.    


This article has been cited by

  • 1. Walaa A. Abbas, Ibrahim H. Abdullah, Basant A. Ali, Nashaat Ahmed, Aya M. Mohamed, Marwan Y. Rezk, Noha Ismail, Mona A. Mohamed, Nageh K. Allam, Recent advances in the use of TiO2 nanotube powder in biological, environmental, and energy applications, Nanoscale Advances, 2019, 10.1039/C9NA00339H

Reader Comments

your name: *   your email: *  

Copyright Info: 2016, Nhung Thi-Tuyet Hoang, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

Download full text in PDF

Export Citation

Copyright © AIMS Press All Rights Reserved