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Binding of heavy metal ions by formaldehyde‐polymerized peanut skins
Author(s) -
Randall John M.,
Hautala Earl,
McDonald Gary
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220207
Subject(s) - formaldehyde , sorption , metal ions in aqueous solution , aqueous solution , chemistry , metal , substrate (aquarium) , nuclear chemistry , polymerization , ion , inorganic chemistry , adsorption , organic chemistry , polymer , oceanography , geology
Peanut skin, when treated with formaldehyde to polymerize tannins, is a highly efficient substrate for removal of many heavy metal ions from aqueous waste solutions. The ions Ag 1+ , Cd 2+ , Cr 6+ , Cu 2+ , Hg 2+ , Ni 2+ , Pb 2+ , Zn 2+ , as well as Ca 2+ and Mg 2+ , were contacted with formaldehyde‐treated peanut skin. Quantitative removal could be achieved with Ag 1+ , Cd 2+ , Cu 2+ , Hg 2+ , Pb 2+ , and Zn 2+ . Capacity of the substrate for ions was promising for Pb 2+ (2.1 meq/g substrate), Cu 2+ (3.0 meq/g), and Cd 2+ (1.3 meq/g). Sorption from a solution containing Cd 2+ , Cu 2+ , Hg 2+ , Ni 2+ , Pb 2+ , Zn 2+ , on a packed column of formaldehyde‐treated peanut skin indicated that Hg 2+ , Pb 2+ , and Cu 2+ were rapidly and completely bound to the packing, while Cd 2+ , Ni 2+ , and Zn 2+ were poorly bound until the preferred ions had been removed from solution.