Chelating resins supporting dithiocarbamate and methylthiourea groups in adsorption of heavy metal ions

✍ Scribed by A. Lezzi; S. Cobianco

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 626 KB
• Volume: 54
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1994.070540708

✦ Synopsis

Two different sulfur atom containing functional groups were introduced into poly ( styreneg-ethylene glycols), PSR-ET( 13) OH, consisting of a cross-linked polystyrene backbone grafted with linear poly(ethy1ene glycol) chains. Reaction of an amino derivative of the polymeric substrate with carbon disulfide and methylisothiocyanate produced new chelating resins of dithiocarbamate type, PSR-ET( 13) CS2Na, and methylthiourea type, PSR-E T ( 13)TU, respectively. The adsorption behavior of these resins was studied toward Hg ( I1 ) , Cd ( I1 ) , Cu ( 11) , and P b (I1 ) ions in different experimental conditions. The order of metal adsorption for dithiocarbamate-supported resins was Hg( 11) > P b ( 11) % Cd( 11) > Cu( 11) and for methylthiourea-supported resins was Hg( 11) p Cu( 11) > Cd( 11) % Pb( 11).

Different regeneration methods were performed with the dithiocarbamate and methylthiourea resins; the former was regenerated by complete mineralization of the metal complexes, the latter by treatment with a solution of 6 N HCl and 10% of thiourea.