Study on antibacterial activity (Escherichia coli) of porous ceramic fixed with silver nanoparticles
Main Article Content
Abstract
Silver nanoparticles fixed in porous ceramic (AgNPs/PC) with the silver content of about
200- 250 mg/kg was prepared by impregnating porous ceramic (PC) in colloidal silver nanoparticles solution with particles size of 10 - 15 nm. Results of antibacterial activity of in vitro test for E. coli indicated that AgNPs/PC has high antibacterial efficiency of about 92% compared to 0.6% of PC. Flow test was carried out with water of an initial inoculated E. coli contamination of about 106 CFU/100ml, at the flow rate of ~ 5 L/h. Results showed that the contamination of E. coli in filtrated water passed through AgNPs/PC (up to 500 litters) was less than 1 CFU/100ml, it is satisfactory to TCVN 6096-2004 for bottled drinking water, in comparison with 2.5x104 CFU/100ml for bare porous ceramic (only up to 40 litters). Moreover, the contents of silver released from AgNPs/PC into filtrated
water samples were less than 10 μg/L, it is far below the WHO guideline of 100 μg/L silver for drinking water. Thus, AgNPs/PC candle with the silver content of 200- 250 mg/kg, the specific surface area of 1.51 m2/g and the average pore size of 48.2 Å has highly antimicrobial effect that can be applied for point-of-use drinking water treatment.
Article Details
Keywords
Porous ceramic, silver nanoparticles, antibacterial activity, filter candle, water treatment
References
[2] K. Zodrow, L. Brunet, S. Mahendra, D. Li, A. Zhang, Q. Li, P. J.J. Alvarez, Polysulfone ultrafiltration membranes impregnated with silver nanoparticles show improved biofouling resistance and virus removal, Water Res. 43, pp. 715-723, 2009.
[3] B.D. Gusseme, L. Sintubin, L. Baert, E. Thibo, T. Hennebel, G. Vermeulen, M. Uyttendaele, W. Verstraete, N. Boon, Biogenic silver for disinfection of water contaminated with viruses, Appl. Environ.
Microbiol. 76, pp. 1082-1087, 2010.
[4] P. Jain, T. Pradeep, Potential of silver nanoparticle-coated polyurethane foam as an antibacterial water filter, Biotechnol. Bioeng. 90, pp. 59-63, 2005.
[5] J.S. Taurozzi, H. Arul, V.Z. Bosak, A.F. Burban, T.C. Voice, M.L. Bruening, V.V Tarabara, Effect of filler incorporation route on the properties of polysulfone-silver nanocomposite membranes of different
porosities, J. Membr. Sci. 325, pp. 58-68, 2008.
[6] Y. Lv, H. Liu, Z. Wang, S. Liu, L. Hao, Y. Sang, D. Liu, J. Wang, R.I. Boughton, Silver nanoparticle-decorated porous ceramic composite for water treatment, J. Membr. Sci. 331, pp. 50-56, 2009.
[7] C.H. Tseng, C.C. Wang, C.Y. Chen, Polypropylene fibers modified by plasma treatment for preparation of Ag nanoparticles, J. Phys. Chem. 110, pp. 4020-4029, 2006.
[8] World Health Organization. Guidelines for Drinking-Water Quality. First Addendum to Third Edition, Vol. 1 Recommendations, Geneva, 2006.
[9] Nguyễn Quốc Hiến và ccs. Nghiên cứu áp dụng phương pháp chiếu xạ chế tạo bạc nano
gắn lên vật liệu sứ xốp ứng dụng xử lý nước. Đề tài Cấp Bộ, MS: ĐTCB/11/07-01, 2013.
[10] Đặng Văn Phú và ccs. Nghiên cứu gắn bạc nano lên sợi polyetylen biến tính ghép với axit acrylic bằng phương pháp chiếu xạ dùng làm vật liệu xử lý nước. Đề tài Cấp Cơ sở, MS: CS/11/07-03, 2011.
[11] X. Sui, X. Huang, The characterization and water purification behavior of gradient ceramic membranes, Sep. Purif. Technol. 32, pp. 73-79, 2003.
[12] V.A. Oyanedel-Craver, J.A. Smith, Sustainable colloidal-silver-impregnated ceramic filter for point-of-use water treatment, Environ. Sci. Technol. 42, pp. 927-933, 2008.
[13] D. Van Halem, H. van der Laan, S.G.J. Heijman, J.C. van Dijk. G.L. Amy, Assessing the sustainability of the silver-impregnated ceramic pot filter for low-cost household drinking water treatment, Phys. Chem. Earth 34, pp. 36-42, 2009.
[14] J.J. Simonis, A.K. Basson, Evaluation of a low-cost ceramic micro-porous filter for elimination of common disease microorganism, Phys. Chem. Earth 36, pp. 1129-1134, 2011.