Abstract:

In order to study the adsorption properties of rice straw fiber for Cu2+,the influence of initial Cu2+ concentration, time,temperature, ratio of solid to liquid and pH value on adsorption were discussed.The infrared spectroscopy before and after adsorption were analyzed and compared.The results show that the adsorption properties of Cu2+ by rice straw fiber mainly is a physical adsorption. At the same time, a very small amount of chemical adsorption exists in the adsorption process. Rice straw fiber, for Cu2+, has fast and good adsorption properties, and has better adsorption effect especially for Cu2+ of low concentration; the influence of the initial pH value on adsorption properties of rice straw fiber is large, ambient temperature bas less effect on the adsorption properties of rice straw fibers; and when the solid-liquid ratio of 7.5mg/L, the initial pH value is 5, and the adsorption priperties of rice straw to Cu2+ reach the best. 

Key words: rice-straw fiber, copperions, adsorption property, infrared spectroscopy