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Korean Chemical Engineering Research,
Vol.50, No.1, 11-17, 2012
Vol.50, No.1, 11-17, 2012
TiO2 광촉매 시스템을 이용한 음용수 중의 대장균 살균연구
Disinfection of E.coli in Drinking Water by TiO2 Photocatalytic System
졸-겔 방법에 의하여 제조된 TiO2와 TiO2-SiO2 광촉매를 이용한 음용수 중의 대장균 살균과 엔도톡신 제거에 관한 연구를 수행하였다. 대장균 살균실험은 대장균이 포함된 물이 순환되는 annular-흐름식 광촉매 코팅 반응기에서 수행되었다. 대장균의 살균능은 TiO2와 TiO2-SiO2 광촉매의 아나타제 결정성피크의 세기와 비례하였다. UV-A 조사하에 TiO2가 코팅된 반응기에서 2시간 내에 대장균을 100% 살균시킬 수 있었으며, 대장균 사멸시 생성되는 독성물질인 엔도톡신이 존재하지 않았다. 그러나 UV-C 조사하에서는 30분 이내에 대장균을 100% 살균할 수 있었으나 엔도톡신이 완전히 제게되지 않았다. 따라서 광촉매와 UV-A 조사가 음용수 살균에 유용함을 알 수 있었다.
Disinfection of Escherichia coli (E. coli) in drinking water was investigated by using TiO2 and TiO2-SiO2 based photocatalyst prepared by sol-gel method. The disinfection test was carried out in an annular flow reactor with circulating sterile water containing the photocatalysts powder under UV-A irradiation. The disinfection activity was proportional to the anatase`s intensity of crystalline peak of the TiO2 photocatalysts. 100% disinfection of E.coli without endotoxin was achieved with TiO2 coated photocatalytic system under UV-A irradiation within 2 h. However, toxic endotoxine was exist in the disinfection of E.colithe under UV-C irradiation even though 100% disinfection of E.colithe within 30 min, which suggest that TiO2 coated photocatalytic system with UV-A is useful tool for the disinfection of E.coli in drinking water.
Keywords:
Disinfection of E.coli; TiO2 Photocatalyst; Toxic Endotoxine; TiO2-SiO2 Photocatalyst; Drinking Water
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