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Double‐metal complexation of heterogels containing cyanobacterial polysaccharides
Author(s) -
Okajima Maiko K.,
le Nguyen Quyen Thi,
Nakamura Masatoshi,
Ogawa Tetsuya,
Kurata Hiroki,
Kaneko Tatsuo
Publication year - 2012
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.38261
Subject(s) - sorption , vinyl alcohol , metal , transmission electron microscopy , morphology (biology) , polysaccharide , chemical engineering , polymer chemistry , materials science , chemistry , nanotechnology , adsorption , organic chemistry , polymer , biology , engineering , genetics
Cryogenic‐transmission electron microscopy of metal complexes with cyanobacterial polysaccharides, sacran, extracted from Aphanothece sacrum biomaterials reveals that Nd 3+ complexes form networks composed of thick strings with a thickness ranging 10–20 nm while Fe 2+ ones make dense entanglement of very thin strings. When Fe 2+ and Nd 3+ double complexation occurs, dense nanonetworks composed of thick strings with a thickness around 10 nm are formed. Next we prepared heterogels by crosslinking poly(vinyl alcohol) chains in the presence of sacran and investigated the effects of double complexation on metal sorption. The amount of Nd 3+ sorbed into the heterogels in the 1 : 1 miscible solution of Fe 2+ and Nd 3+ is higher than that in the solution containing only Nd 3+, suggesting that Fe 2+ assists the Nd 3+ sorption. In addition, it is found that the amount of sorbed Nd 3+ is much higher than that of sorbed Fe 2+ even in the acidic condition of pH 2. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013