Removal of toxic heavy metal ions in runoffs by modified alfalfa and juniper

Abstract

A series of batch isotherm tests was performed with alfalfa and juniper fibers to evaluate the effectiveness in filtering toxic heavy metals from stormwater. The adsorption of the heavy metal ions on the alfalfa and juniper fibers was strongly dependent on the equilibrium pH value of the solution. The change in sorption rate over time showed that two different sorption processes occurred a fast ion exchange followed by a chemisorption. Heavy metals were less sorbed when they are in solution together than when they exist alone in solution; however, the total adsorptive capacity of the adsorbent in multi-component phase was larger than that in a single compound phase. The sorption order based on mass of adsorbed ion is Cu>Cd>Ni, Zn. Sulfonation modification increased more than 250% of the sorption capacity of juniper fiber.

Citation

Han, J.S.; Park, J.K.; Min, S.H. 2000. Removal of toxic heavy metal ions in runoffs by modified alfalfa and juniper. 1st World Congress of the International Water Association : July 3-7, 2000, Paris, France. [S.l. : s.n.], 2000: Pages 1-4