Use of biopolymers and acrylamide-based hydrogels for sorption of Cu^2^+, Fe^2^+ and Cr^6^+ ions from their aqueous solutions [An article from: Desalination]

This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Hydrogels of two important biopolymers (dextrin and starch) with different acrylamide monomers viz., acrylamide, N-isopropyl acrylamide and 2-acrylamido-2-methylpropanesulfonic acid and crosslinked with N,N-methylene bisacrylamide were used as sorbents for three transition metal ions. These hydrogels have high water absorption capacity and also have ion exchange groups. The hydrogels have been used to extract Fe^2^+, Cu^2^+ and Cu^6^+ ions from their aqueous solutions. Sorption of these ions has been studied as a function of nature of backbone polymer and crosslinker concentration used in the synthesis of these hydrogels. Effect of functionalization of hydrogels by partial hydrolysis with 0.5 M NaOH on metal ion uptake has also been studied, and it results in appreciable uptake of Cu^2^+ ions and Fe^2^+ ions but in total rejection of Cr^6^+ ions. These results are of interest for the development of hydrogel-based technologies for water purification and metal ions separation and enrichment.