Double-metal complexation of heterogels containing cyanobacterial polysaccharides

• Published in: Journal of applied polymer science Vol. 128; no. 1; pp. 676 - 683
• Main Authors: Okajima, Maiko K., le Nguyen, Quyen Thi, Nakamura, Masatoshi, Ogawa, Tetsuya, Kurata, Hiroki, Kaneko, Tatsuo
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.04.2013; Wiley; Wiley Subscription Services, Inc
• Subjects: Aphanothece sacrum; Applied sciences; Biomedical materials; Complexation; cyanobacteria; Exact sciences and technology; gels; Materials science; metal complexation; Nanocomposites; Nanomaterials; Nanostructure; Natural polymers; Organic polymers; Physicochemistry of polymers; Polymers; Polysaccharides; Properties and characterization; rare earth metals; Solution and gel properties; Sorption; Starch and polysaccharides; Strings; polysaccharides; Iron II; Metal ion; Uronide polymer; Crosslinking; Alginates; Semiinterpenetrating polymer network; Experimental study; Colloidal gel; Polyelectrolyte; Polyvinylalcohol; Binding capacity; Lanthanide ion; Neodymium III; Microbial origin; gels; metal complexation; Cyanobacteria; Bacteria; Oside polymer; Sorbent; rare earth metals
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.38261

Cryogenic‐transmission electron microscopy of metal complexes with cyanobacterial polysaccharides, sacran, extracted from Aphanothece sacrum biomaterials reveals that Nd3+ complexes form networks composed of thick strings with a thickness ranging 10–20 nm while Fe2+ ones make dense entanglement of very thin strings. When Fe2+ and Nd3+ 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 Nd3+ sorbed into the heterogels in the 1 : 1 miscible solution of Fe2+ and Nd3+ is higher than that in the solution containing only Nd3+, suggesting that Fe2+ assists the Nd3+ sorption. In addition, it is found that the amount of sorbed Nd3+ is much higher than that of sorbed Fe2+ even in the acidic condition of pH 2. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013