skip to main content
Original Article

Photocatalytic properties of silica nanoparticles in water decontamination; adsorption and photocatalytic disinfection



In this experimental research the adsorption and photocatalytic properties of silica nanoparticles were used to disinfection water against the gram-negative Escherichia coli bacteria. Silica nanoparticles were synthesized by modified Stober method and characterized. TEM image shows that the prepared nanoparticles were spherical with 20-30 nanometers diameter and 4.25 eV bandgap energy. The disc diffusion test was employed to evaluate the antimicrobial properties of produced nanoparticles against the Escherichia coli bacteria. The optimal pH of water disinfection was determined for decontamination. And finally silica nanoparticles activity was assayed to disinfect the suspended Escherichia coli bacteria in water by adsorption and photocatalytic mechanisms. Results were compared with photolysis process. According to disc diffusion test, the antimicrobial effects of silica nanoparticles strongly depend of their concentration. Results confirm that silica nanoparticles are capable for cheap and fast decontamination of bacterial infected water.