نوع مقاله : مقاله مروری
نویسندگان
1 دانشجوی دکترا، آزمایشگاه تحقیقاتی صنایع شیمیایی معدنی، دانشکده مهندسی شیمی، دانشگاه علم و صنعت ایران،
2 استاد، آزمایشگاه تحقیقاتی صنایع شیمیایی معدنی، دانشکده مهندسی شیمی، دانشگاه علم و صنعت ایران
3 دانشجوی دکترا، آزمایشگاه تحقیقاتی صنایع شیمیایی معدنی، دانشکده مهندسی شیمی، دانشگاه علم و صنعت ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The adsorption process is an effective method that is widely applied to remove dyes from wastewater due to its simplicity, availability, ease of process and reasonable price. Nano adsorbents with unique properties such as larger surface area, surface interactions and improved reactivity are providing new opportunities for removal of pollutants using an efficient and cost-effective method compared to other methods. In the meanwhile, a group of alumina nanocomposites have been considered as adsorbents owing to their high surface area, good mechanical properties and great resistance to thermal degradation. Nanocomposites consist of at least two phases that are dispersed into each other to form a three-dimensional network. Nanocomposites display different properties of bulk material. In this study, the adsorption capacity of alumina-based composite Nano adsorbents, including alumina-carbon nanotubes, activated carbon, metal oxides, polymer and chitosan has been investigated. In the following, the removal of dyes and organic compounds by alumina-based composite Nano adsorbents and adsorption influencing factors has been reviewed. The effect of various factors on the adsorption capacity of alumina-based composite Nano adsorbents and the adsorption mechanism show that all alumina-based composite Nano adsorbents exhibit excellent adsorption capacity for dye removal. Reviews indicate that Alumina/ Carbon nanotube (CNT) composite is used as an adsorbent to remove dyes. Alumina can affect compressive strength, hydrophilicity, porosity and CNT adsorption capacity. Alumina/CNT composite can multiply the adsorption capacity. Alumina / activated carbon composite can increase the adsorption owing to occurring adsorption process physically and chemically. Activated carbon possespore that can adsorb and alumina has functional groups in order to react with the dye.Chitosan contains functional groups -OH and amino -NH2 that can bind to the dye. Still, chitosan has a strong tendency to agglomerate and form a gel, so many of its functional groups lose the ability to react with the dye. Alumina/chitosan composite improves binding sites and mechanical stability.
کلیدواژهها [English]