Antibacterial activity of bactericidal ceramisite filler immobilized quaternary phosphonium

A novel insoluble bactericidal ceramisite filler was obtained by immobilizing 3-(trimethoxysily1)-1-propanamine onto the surface of ceramisite and reacting with bromo propyl triphenyl phosphonium bromide. The intermediate and product were characterized by Fourier transform infrared spectrometer, thermo gravimetric analyzer, and environment scanning electron microscopy. The antibacterial activity of bactericidal ceramisite against heterotrophic bacteria in the simulated industrial recirculation water was tested by plate count method. The result shows that when the prepared dosage of bactericide ceramisite filler is 0.2 g/mL, the sterilizing ratio can be up to 99.3% in 45 min of operation time. After regenerating the ceramisite filler for one time, its bactericidal ability could be recovered to above 97.2%. When the initial bacterial concentration of 7.48 x 10(6) (colony-forming units (CFU))/mL with 3.1 L water was treated by 90 g of bactericide ceramisite filler in 6 h, the heterotrophic bacteria concentration kept below 5 x 10(5) CFU/mL. After being regenerated, the reused bactericide ceramisite could still treat 2.5 L water as well.