Preparation And Study Of Zn²⁺/Ag⁺ Composite Sepiolite Anti-bacterial Material

As our living-standards and the attention to sanitation rise up, the anti-bacterial material has been a focus. The inorganic ironic anti-bacterial material features the everlasting-effective, heat-enduring properties and great anti-bacterial ability, so it becomes the research hotspot. Ag⁺ is unstable and easy to be turned black, which not only declines the effectiveness of anti-bacterial property, but also makes the material black. Beside this, although the Ag⁺-combined zeolite is the commercial product, but the relatively expensive price of zeolite confines its application range, so how to delay or stop Ag⁺ turn black and to utilize cheap carrier to substitute zeolite has been the difficulty in the inorganic ironic anti-bacterial material's development.This paper used Na3PO4 and HCl to modify sepiolite, and adopted the modified sepiolite, by adsorbing Zn²⁺ and Ag⁺, to produce Zn²⁺ /Ag⁺ composite-combined sepiolite anti-bacterial material. The anti color-change ability and anti-bacterial experiment was taken to show how is about the material's anti color-change ability and bacterial killing property.Through XRD, FTIR, BET SEM and C16H18ClN3S·3H2O sorption experiment, The result showed: after sepiolite reacted with Na3PO4 which takes 15% quantity of sepiolite and was modified by 0.3mol/L HCl, the sepiolite structure was changed, composition purified and appearance modified, reached the greatest specific area that was 61.563m2/g, and the ratio of pores in sepiolite between 4 and 20nm were enlarged.The acid-modified sepiolite was adopted to adsorb both Zn²⁺ and Ag⁺. Through AAS, the result was: the input order of metallic irons had little impact on the amount of adsorption, but the amount of Zn²⁺ adsorbed by acid-modified sepiolite doubled to 4239μg/g, and adversely of Ag⁺ declined to 407μg/g. In the anti color-change ability experiment, no matter radiated by UV for 48h, or placed in natural environment, the Zn²⁺ /Ag⁺ composite-combined sepiolite just showed a little color change, in contract that the Ag⁺-combined sepiolite turned black.The anti-bacterial experiment was carried on with E. coli and Ehrenberg whose concentration was between 12×10²/ml and 15×10²/ml b The conclusion was that the prepared Zn²⁺/Ag⁺ composite-combined sepiolite anti-bacterial material had good performance on killing both bacterial, even though radiated by UV for 48h.