Premium
Synthesis of a polyacrylamidoxime chelating fiber and its efficiency in the retention of palladium ions
Author(s) -
Bilba Nicolae,
Bilba Doina,
Moroi Gabriela
Publication year - 2004
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.20343
Subject(s) - palladium , adsorption , polyacrylonitrile , chelation , chemistry , acrylonitrile , hydrochloric acid , thiourea , inorganic chemistry , fiber , nitrile , polymer chemistry , nuclear chemistry , polymer , organic chemistry , catalysis , copolymer
Abstract A chelating fibrous polymer with metal complexing ability was prepared by partial conversion of the nitrile groups of melana (an acrylonitrile‐based synthetic fiber) into amidoxime groups C(NH 2 ) = NOH using a solution of 3% hydroxylamine in methanol by refluxing at 80°C. The molar ratio of NH 2 OH/CN and the reaction time were adjusted to values of 0.9 and 2 h, respectively. The amidoximated polyacrylonitrile fiber with a 2.89 meq/g ion‐exchange capacity functions as an efficient chelating adsorbent for palladium ions. The pH dependence, the contact time, and the temperature of palladium ion retention from a model solution on amidoximated acrylic fiber were studied. The fibrous chelating adsorbent exhibited high affinity for palladium ions in acidic solution (pH = 2–6) at high temperature (50–60°C). The values of parameters q m and K L (from the Langmuir equation) determined at different temperatures of adsorption and the thermodynamic quantities Δ G , Δ H, and Δ S were calculated. The adsorbed palladium ions can be quantitatively desorbed by elution with a 0.3% hydrochloric solution of thiourea. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3730–3735, 2004