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AbstractAbstract
[en] The colloidal silver nanoparticles (AgNPs) solution with the AgNPs diameter of 10 - 15 nm was synthesized by gamma irradiation method using polyvinylpyrrolidone as stabilizer. Porous ceramic samples were functionalized by treatment with an aminosilan (AS) agent (3-aminopropyltriethoxysilane) and then impregnated in colloidal silver nanoparticles solution for fixing through coordination bonds between (-NH2) groups of the aminosilan and the silver atoms. The AgNPs content attached in porous ceramic (AgNPs/PC) was of about 200-250 mg/kg. The contents of silver release from AgNPs/PC into filtrated water by flowing test with the rate of about 5 litters/h were less than 10 µg/L analyzed by neutron activation analysis method, it is satisfactory to the WHO guideline of 100 µg/L for drinking water. The antimicrobial effect of AgNPs/PC for E. coli was carried out by flowing test with an inoculated initial contamination of E. coli in water of about 106 CFU/100 ml. Results showed that the contamination of E. coli in filtrated water through AgNPs/PC (up to 500 litters) was less than 1 CFU/100 ml compared to 2.5x104 CFU/100 ml for bare porous ceramic (only up to 60 litters). The antimicrobial effect of AgNPs/PC is in accordance with the TCVN 6096-2004 for bottled drinking water. Thus, AgNPs/PC with the silver content of 200-250 mg/kg and the specific surface area of 1.51 m2/g, average pore size of 48.2 Å and pore volume of 1.8x10-3 cm3/g has highly antimicrobial effect that can be applied for point-of-use drinking water treatment. (author)
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Tran Chi Thanh; Cao Dinh Thanh; Nguyen Hoang Anh; Nguyen Thi Kim Dung; Nguyen Thi Dinh; Nguyen Thi Phuong Lan (eds.); Vietnam Atomic Energy Institute, Hanoi (Viet Nam); 360 p; Dec 2013; p. 247-253; VINATOM-AR--12-33; Also available from Information Centre, VINATOM; 19 refs, 4 figs, 5 tabs
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ACTIVATION ANALYSIS, AMIDES, AZOLES, BLOOD SUBSTITUTES, CHEMICAL ANALYSIS, DISPERSIONS, DRUGS, ELECTROMAGNETIC RADIATION, EVALUATION, HEMATOLOGIC AGENTS, HETEROCYCLIC COMPOUNDS, HOMOGENEOUS MIXTURES, IONIZING RADIATIONS, LACTAMS, MATERIALS, MIXTURES, NONDESTRUCTIVE ANALYSIS, ORGANIC COMPOUNDS, ORGANIC NITROGEN COMPOUNDS, ORGANIC POLYMERS, PHYSICAL PROPERTIES, POLYMERS, POLYVINYLS, PYRROLES, PYRROLIDONES, RADIATION EFFECTS, RADIATIONS, SIZE, TRANSITION ELEMENT COMPOUNDS
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