Abstract: Composite antibacterial materials were prepared via co-precipitation method with basic silica sol and dodecyl dimethyl benzyl ammonium chloride as raw materials.Low-temperature N₂ adsorption，SEM，and FT－IR methods were employed to characterize the BET specific surface area，particle morphology，and surface functional groups of the as-made samples. Bacteriostasis circle experiments were conducted to assess the dissolving antibacterial performance of the samples upon staphylococcus aureus.Sustained-release ability of the as-made samples was investigated with dissolving experiment on rotary shaker.It was revealed by the results that as-made organic/inorganic composite antibacterial material show obvious antibacterial performance and good sustained-release ability.The composite materials are expected to be applied in paint or polymer as controlled-releasing antibacterial element.

Key words: antibacterial performance, silica, benzalkonium bromide, sustained-release