Preparation Of Silver-loaded Activated Carbon Fiber And Its Application Performance

Activated carbon fiber has excellent adsorption properties, having been widely used in environmental protection, catalysis, electronic and protection fields. However, it doesn’t have antibacterial property with the numerous holes that can easily adsorb or even breed bacteria. This results in a certain limit of the application in filtration, purification, medical and health fields. Silver antimicrobial agent has excellent antibacterial properties, but its antibacterial activity depends largely on the carrier’s performance. In order to solve the problems above, a new type of silver-loaded activated carbon fiber was prepared, which had both excellent adsorption property and outstanding antibacterial property. The preparation process, structure characteristics, silver release mechanism and application performance were also studied. Finally, product examples were designed to show its applications in water filter, air filter and medical dressing fields.Using alkylated cyclodextrin, silver nitrate and viscose fiber as raw materials, the silver loaded viscose fiber was prepared by precursor silver-loading method. Its structure was characterized by scanning electron microscope(SEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The results showed that the existence format of the silver particles on the silver-loaded activated carbon fiber was metallic silver. And the silver particles were uniformly dispersed with average size of about 20~40nm.The adsorption property, antibacterial property, security and stability were studied. The results showed that silver loading had little effect on the adsorption performance of the activated carbon fiber. The silver-loaded activated carbon fiber, which was safe stable and non-toxic, had excellent antibacterial performance.The silver-loaded activated carbon fiber was immersed in water solution, and silver content of the water solution was then determined by ICP-AES method. The silver release performance of the silver-loaded activated carbon fiber was analyzed. The results indicated that the silver release process of the silver-loaded activated carbon fiber in water solution is combined with the silver ion release of silver particles on fiber and the silver ion reduction-adsorption by activated carbon fiber. The silver-loaded activated carbon fiber shows excellent sustained release ability.The silver-loaded activated carbon fiber was used in medical dressing, mask filter and water purifying filter. Its antibacterial performance and application performance were also explored. Results showed that the silver-loaded activated carbon fiber still had excellent antibacterial properties in the application process. It had a certain practical and promotion value.