Development of nanoparticle and nanotextile based decontamination systems for biological agents

Kalman, Özge
TiO2 is used from sunscreen to wall paint and it found new application areas with the development of nanotechnology. An important utilization area of TiO2 is decontamination and filtration. Similarly, the antimicrobial property of silver has been known from ancient times, but the effect mechanism is not fully understood. The aim of this study was the determination of antimicrobial effects of TiO2, its doped derivatives and silver loaded zeolite. The photodegradation effect of TiO2 was investigated. In this study; powder of TiO2, TiO2 coated textile, tungsten doped and tungstenzinc doped TiO2 coated textile were prepared. After preparation, antimicrobial properties of materials were investigated by applying the indicator microorganisms, namely E.coli, as Gr (-) bacteria, S.aureus as Gr (+) bacteria, B. atrophaeus as Gr (+) bacterial spores, E.dermatitidis as fungi and A.niger as fungi spore were used for experiments. Photocatalytic effect of TiO2 was better observed on E.coli at 2 hours of illumination, especially with tungsten zinc doped textile. The antimicrobial efficiency was as follows: E.coli > S.aureus > A.niger spores > E.dermatitidis> B.atrophaeus spores. TiO2 coated textile surfaces affected the enzymatic activity starting from 1 hour illumination. Same time was needed for observing photodegradation activity. Antimicrobial effect of silver showed similar result with TiO2. The effecting concentration of silver increased in following order; E.coli< S.aureus< E.dermatitidis A.niger spores< B.atrophaeus spores < S.infantis. vi TiO2 related part of this work was conducted in the frame of SAN-TEZ Project No: 00860.STZ.2011-1. Nanobiz Nanobiotechnological Systems R&D Ltd. Corporation funded silver loaded zeolite part of the study.