Separation and extraction of some heavy and toxic metal ions from their wastes by grafted membranes

Abstract

Preparation and characterization of a series of ion-exchange membranes for the purpose of separation and extraction of some heavy and toxic metal ions from their wastes were studied. Such ion-exchange membranes were prepared by ␥-radiation grafting of acrylonitrile (AN) and vinyl acetate (VAc) in a binary monomer mixture onto low-density polyethylene (LDPE) using the direct technique of grafting. The reaction conditions at which the grafting process proceeds successfully were determined. Many modification treatments were attempted for the prepared membranes to improve their ion-exchange properties. The possibility of their practical use in waste-water treatment to remove some heavy and toxic metal ions such as Pb 2ϩ , Cd 2ϩ , Cu 2ϩ , Fe 3ϩ , Sr 2ϩ , and Li ϩ were investigated. These grafted membranes showed great promise for possible use in the field of extraction and removal of some heavy and toxic metals from their wastes.

Preparation of Amidoxime Adsorbent by Radiation Induced Grafting of Acrylonitrile on Polyethylene Film and Its Application in Cr(VI) Removal

“…A number of researchers have studied single or binary monomer grafted PE film for heavy metal ion adsorption. [39][40][41][42] A polymeric adsorbent material based on PE was prepared by photo grafting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) monomer on to a PE film and investigated for Cr(VI) removal. 43 Composite particles were synthesised using titanium oxide attached to PE films by plasma techniques and used for the removal of Cr(VI) from aqueous solutions in batch systems.…”

In Separation and Purification

“…The stability of similar membranes was improved by grafting of AAc and N -VPn onto PTFE fi lms. These membranes were found to have potential for separation of Cu 2+ , Ni 2+ , Pb 2+ , Cd 2+ , Zn 2+ , Mn 2+ , Co 2+ , Cr 2+ , and Fe 3+ ions [186,190] .…”

Removal of cesium‐134 and cobalt‐60 with radiation‐grafted copolymers from their liquid wastes

“…This technique was described in a previous study. 14 The degree of swelling of the membranes was determined as follows:…”

“…1,2 The direct radiation grafting of different vinyl monomers and their mixtures onto low-density polyethylene, high-density polyethylene, and polypropylene (PP) films was carried out for metal-ion separation from solutions containing a single cation or simulated medium-active waste. [3][4][5][6][7][8][9][10][11][12][13] In this study, the radiation-induced graft copolymerization of an acrylamide (AAm)/vinyl acetate (VAc) comonomer mixture onto PP films was investigated for the preparation of ion-exchange membranes that could meet the requirements of chelation of cesium-134 and cobalt-60 from their liquid wastes. The effect of the grafting conditions on the grafting yield was determined as well as the chemical treatment of the grafted amide and acetate groups for the production of different functional groups.…”