Journal
POLIMEROS-CIENCIA E TECNOLOGIA
Volume 28, Issue 2, Pages 139-146Publisher
ASSOC BRASIL POLIMEROS
DOI: 10.1590/0104-1428.11316
Keywords
graft copolymer; alginate; acrylamide; ultrasound; adsorbents; methylene blue
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Funding
- Brazilian governmental agency CNPq
- Brazilian governmental agency CAPES
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A polymeric adsorbent based on sodium alginate (SAG) grafted with polyacrylamide (PAM) (SAG-g-PAM) was synthesized using an ultrasound-assisted method. The addition polymerization was carried out with ammonium persulfate as the initiator, at different acrylamide (AM) concentrations. The SAG-g-PAM copolymers were evaluated by FTIR and C-13 NMR spectroscopies, thermogravimetric analysis, grafting efficiency (%GE) and intrinsic viscosity in NaCl solution at 25 degrees C. Graft copolymers could be obtained in reaction lasting until 10 min by using ultrasound energy with grafting efficiency above 75%. The decolorization efficiency and adsorption capacity of the SAG-g-PAM copolymers were investigated in the adsorption of methylene blue (MB). The dye adsorption was pH dependent, and adsorption capacity (69.13 mg/g) maxima was at pH 10. All the graft copolymers have shown the same decolorization efficiency (99%), and the best one for MB removing is the SAG-g-PAM(6) (%GE, = 75%), since lower acrylamide content is required in the synthesis.
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