Study On The Antibacterial Performance Of Nano Silver Loaded On Modified Sepiolite

A large amount of antibacterial agents are used for inhibiting or slowing fungal and bacterial growth to protect environment and human health.Efficient and stable antibacterial products will be served for our economy,contribute to improving people's quality of life.More and more attentions have been put on inorganic antibacterial agents because of their chemical stability,low toxicity,long lasting action period and outstanding broad-spectrum antibacterial activity.As we know,thermal evaluation is one of the most important quality criteria for antibacterial porcelain.The ability of anti-ultraviolet,resistance to acids,alkalis and organic solvents are key indicators of antibacterial coating.Thus,the stability of inorganic materials remains to be improved.In this work,sodium dodecyl benzenesulfonate?SDBS?as the surfactant-modified agent,and the modified sepiolite?SMS?was prepared by using a simple method.We report the preparation of antibacterial material with high stability via a facile method to adsord Ag onto SMS,which was further coated with a layer of SiO₂ by hydrolysis and polycondensation of tetraethoxysilane.A layer of SiO₂ was introduced to improve the resistance to chemical,UV-light and thermal stability and prolong period of antibacterial property.The maximum adsorptive capacity of SMS for Ag reached 2.74 % compared with only 0.44 % using unmodified sepiolite.FT-IR,TEM,XRD and BET confirm that the SDBS and a layer of SiO₂ are successfully coated on the surface of supporter.Thermogravimetric analysis?TGA?,UV-Vis and ICP show excellent thermal and chemical stability and a long service life.Highly monodisperse Ag nanoparticles?AgNPs?were prepared by microemulsion method.Dioctyl sodium sulfosuccinate?AOT?was dissolved in cyclohexane to form the model of “lifebuoy”.And AgNPs were obtained by chemical reduction of AgNO₃ dissolved in “lifebuoy” by using hydrazine dissolved in water core in another “lifebuoy”.AgNPs of approximately 5-10 nm with high stability were supported on acid activated sepiolite?AgNPs/AAS?.UV-Vis,TEM and XRD were used to characterize the structure,size and size distribution of the synthesized AgNPs.In addition,the slow release property of AgNPs/AAS was also demonstrated.