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Cu(II) immobilization in AAc/NIPAAm-based polymer systems synthesized using ionizing radiation

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Title: Cu(II) immobilization in AAc/NIPAAm-based polymer systems synthesized using ionizing radiation
Authors: Burillo, Guillermina burillo@nucleares.unam.mx, Castillo-Rojas, Susana1, Arrieta, Herzaín1
Source: Radiation Physics & Chemistry. Mar2012, Vol. 81 Issue 3, p278-283. 6p.
Subjects: Copper ions, Polymers, Ionizing radiation, pH effect, Monomers, Acrylamide synthesis, Acrylic acid
Abstract: Abstract: Polymer systems based on the pH-responsive monomer acrylic acid (AAc) and the thermosensitive monomer N-isopropylacrylamide (NIPAAm) were synthesized using gamma radiation. Three systems were synthesized: a comb-type hydrogel structure (grafting of NIPAAm onto crosslinked PAAc), a binary graft of both monomers onto a polypropylene (PP) film synthesized by a one-step method and a binary graft prepared by a two-step method. The binary graft systems were characterized by swelling behavior and the reversibility of water uptake. The three systems were compared with respect to their Cu(II) adsorption quantity, reversibility and time response. The binary graft system synthesized in one step exhibited the best adsorption response. The comb-type hydrogel required 150h to reach its maximum swelling percentage, and the binary graft systems on polypropylene (PP) prepared by the one- and two-step irradiation-based methods required 10 and 30min, respectively. The optimum pH range for Cu(II) immobilization was 5–6 in the binary graft system synthesized in one step. The maximum adsorption capacity for Cu(II) in the (PP-g-(AAc/NIPAAm)) (45% graft) was found to be 337mgg−1, and the adsorption followed the Freundlich model. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Polymer systems based on the pH-responsive monomer acrylic acid (AAc) and the thermosensitive monomer N-isopropylacrylamide (NIPAAm) were synthesized using gamma radiation. Three systems were synthesized: a comb-type hydrogel structure (grafting of NIPAAm onto crosslinked PAAc), a binary graft of both monomers onto a polypropylene (PP) film synthesized by a one-step method and a binary graft prepared by a two-step method. The binary graft systems were characterized by swelling behavior and the reversibility of water uptake. The three systems were compared with respect to their Cu(II) adsorption quantity, reversibility and time response. The binary graft system synthesized in one step exhibited the best adsorption response. The comb-type hydrogel required 150h to reach its maximum swelling percentage, and the binary graft systems on polypropylene (PP) prepared by the one- and two-step irradiation-based methods required 10 and 30min, respectively. The optimum pH range for Cu(II) immobilization was 5–6 in the binary graft system synthesized in one step. The maximum adsorption capacity for Cu(II) in the (PP-g-(AAc/NIPAAm)) (45% graft) was found to be 337mgg−1, and the adsorption followed the Freundlich model. [Copyright &y& Elsevier]
ISSN:0969806X
DOI:10.1016/j.radphyschem.2011.11.010