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Mechanism of copper(II) adsorption by polyvinyl polyacrylate
Author(s) -
Nakajima Akira,
Sakai Naoko,
Yamauchi Jun
Publication year - 2006
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.24940
Subject(s) - adsorption , copper , dimer , chemistry , nuclear chemistry , paramagnetism , absorption (acoustics) , inorganic chemistry , polymer chemistry , materials science , organic chemistry , physics , quantum mechanics , composite material
The mechanism of copper adsorption by polyvinyl polyacrylate (PVPA) was examined using ESR and magnetic measurements. The copper adsorption by PVPA obeyed Langmuir adsorption isotherm with the maximum adsorption amounts of 4.17 mmol g −1 adsorbent, being larger than those of uranium adsorption. Though copper in the solution was completely adsorbed by the resin above pH 4, the ESR intensity was remained low level and only increased above pH 8. The ESR spectrum of Cu(II) ion in PVPA are axial type with tetragonally distorted octahedral symmetry, having parameters of g ⊥ = 2.361, g ⟂ = 2.057, | A ⊥ | = 14.0 m cm −1 (pH 5), and g ⊥ = 2.329, g ⟂ = 2.058, | A ⊥ | = 16.2 m cm −1 , | A ⟂ | = 2.7 m cm −1 (pH 9). The absorption peaks originated from Cu(II)–Cu(II) dimer was also observed (pH 5). The paramagnetic susceptibility of PVPA adsorbed Cu(II) ion at pH 5 explained by the dimer model with | J | = 220 K. These results suggested that most of copper was adsorbed and formed dimer in PVPA, being similar to that in Cu(II)‐acetate monohydrate. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:5372–5377, 2006