Preparation And Application Of Rare Earth - Silver Antimicrobial Silica

As a new kind of function materials, antibacterial materials can inhibit the bacillus, viruses and other harmful bacteria around our surroundings effectively. As the inorganic antibacterial materials showed many merits such as, inhibited the harmful bacteria obviously, be friendly to the environment and others, so they has become a key point in the antibacterial fields. In this paper sodium metasilicate and sodium bicarbonate was selected as raw materials, silver ions was used as the antibacterial ion, rare earth ions was used as the additive, then the rare earth-silver antibacterial white carbon black was synthesized. While the paper has find the optimized reaction conditions by experiments. At the same time the structure and property of the inorganic antibacterial material were characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) techniques, energy dispersive spectrum (EDS) analysis, X-ray Diffraction (XRD). The paper has chose the Ag-Ho antibacterial white carbon black and 903 silicon rubber to synthesize antibacterial silicon rubber. The result shows that, the optimized reaction conditions of Ag-Ho antibacterial white carbon black were as follows:the reaction time was 2.5 h; the silver ion concentration was 0.09 mol·L-1 and holmium ions concentration 0.003 mol·L-1 respectively. The bacteriostasis rate of rare earth-Ag antibacterial white carbon black was higher than that of the general Ag-antibacterial white carbon black(without containing rare earth). The XRD pattern shows that the product of rare earth-Ag codoped antibacterial White Carbon Black were amorphous. The SEM image and EDS analysis show that the antibacterial has smaller particle size and uniform distribution, and there are silver ion and rare earth ion in the antibacterial materials. The FTIR spectra explains that the addictive silver ion and rare earth ion has changed the structure of white carbon black little, so the new antibacterial materials not only can inhibit harmful bacteria but also can be used in these fields that the white carbon black are used. Mechanical properties testing and antibacterial has been tested to the antibacterial silicon rubber, the result reveals that added Ag-Ho antibacterial white carbon black mass percent 0.5% to 903 silicon rubber, the bacteriostasis rate was over 99% and the mechanical properties was meet industry standards, so 0.5% was the optimized add mas.