US EPA

4966117 

Journal Article 

SYNTHESIS OF THIOL CHELATING RESINS AND THEIR ADSORPTION PROPERTIES TOWARD HEAVY-METAL IONS 

Lezzi, A; Cobianco, S; Roggero, A 

1994 

Yes 

Journal of Polymer Science. Part A, Polymer Chemistry
ISSN: 0887-624X
EISSN: 1099-0518 

32 

10 

1877-1883 

10.1002/pola.1994.080321008 

WOS:A1994NU80900008 

A series of chelating resins, derived from a macroreticular styrene-divinylbenzene (2%) copolymer beads grafted with various poly(ethylene glycols) HO-(-CH2 -CH2-0-)n-H (n = 0, 4, 9, 13) and containing thiol groups as chelating functions, have been synthesized in a three-step reaction sequence. The structure of the functionalized resins was confirmed by IR spectrophotometry, elemental analysis, and differential scanning calorimetry. The complexation behavior of these thiol resins was investigated towards Hg(II), Cu(II), and Pb(II) ions in aqueous solution by a batch equilibration technique. The influence of pH on adsorption capacity was also examined. The adsorption values for metal ions' intake followed the order Hg(II) > Cu(II) > Pb(II). The affinity of these polymers towards Hg(II) ions was so high that the total mercury level in the liquid decreased from 20 ppm to below 10 ppb after 2 h of treatment. Polymers can be regenerated by washing with a solution of hydrochloric acid (6N) and 10% by weight of an aqueous solution of thiourea. (C) 1994 John Wiley & Sons, inc. 

INSOLUBLE CHELATING POLYMERS; THIOL LIGAND; POLY(ETHYLENE GLYCOLS) CHAINS; FUNCTIONAL POLYMERS; HEAVY METAL ION RECOVERY