Porous ceramic candle filters (PCCF) were prepared by sintering silica from rice husk with silver nanoparticles (AgNPs)/zeolite A at about 1050°C to create bactericidal PCCF/AgNPs for water disinfection. The silver content in PCCF/AgNPs was of 300-350 mg/kg determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and the average pore size of PCCF/AgNPs was of 50-70 A measured by Brunauer-Emmett-Teller (BET) method. The bactericidal activity and silver release of PCCF/AgNPs have been investigated by flow test with water flow rate of 5 L/h and initial inoculation of E. coli in inlet water of 10 exponent 6 CFU/100 mL. The volume of filtrated water was collected up to 500 L. Results showed that the contamination of E. coli in filtrated water was 1 CFU/100 mL and the content of silver released from PCCF/AgNPs into filtrated water was 1 ug/ L, it is low, far under the WHO guideline of 100 ug/L atmaximum for drinking water. Based on the content of silver in PCCF/ AgNPs and in filtrated water, it was estimated that one PCCF/AgNPs could be used to filtrate of ~100m3 water. Thus, as-prepared PCCF/AgNPs releases low content of silver into water and shows effectively bactericidal activity that is promising to apply as point-of-use water treatment technology for drinking water disinfection.
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