ИСТИНА

The photodynamic inactivation of microorganisms is a promising approach for disinfection of water. In most studies, for this purpose water-soluble photosensitizers were tested. It was established that photodynamic disinfection of aqueous systems by water-soluble sensitizers is rather efficient. However, removal of water-soluble dyes and their photoproducts from treated solution is extremely difficult. Therefore, the use of heterogeneous photosensitizers where dyes are immobilized onto solid materials might be more promising because heterogeneous photosensitizers can be easily separated from the solutions by centrifugation or filtration. We have developed a new heterogeneous photosensitizers in which positively charged phthalocyanine was anchored to silica by spacers with different lengths. The spectral, fluorescent properties and photosensitizing tendencies of new heterogeneous sensitizers were investigated. The effect of spacer length upon phthalocyanine absorption and fluorescence spectra, singlet oxygen quantum yield was not observed. However efficiency of photodynamic inactivation of bacteria enhanced drastically along with spacer length.