Novel composite sorbent AAm/MA hydrogels containing starch and kaolin for water sorption and dye uptake

• Published in: Bulletin of materials science 2014-12, Vol.37 (7), p.1637-1646
• Main Authors: KARADAĞ, ERDENER, TOPAÇ, FULYA, KUNDAKCI, SEMİHA, ÜZÜM, ÖMER BARIŞ
• Format: Article
• Language: English
• Subjects: Acids; Acrylamide; Ammonium peroxodisulfate; Aqueous solutions; Cationic dyes; Chemical composition; Chemistry and Materials Science; Clay; Clay (material); Crosslinking; Dyes; Engineering; Ethylene glycol; Free radical polymerization; Free radicals; Hydrogels; Infrared analysis; Interpenetrating networks; Investigations; Kaolin; Maleic acid; Materials Science; Morphology; Polymerization; Polymers; Solution polymerization; Sorbents; Sorption; Starches; Toluidine blue
• ISSN: 0250-4707; 0973-7669
• DOI: 10.1007/s12034-014-0723-9

A novel polymer/clay composite sorbent based on acrylamide/maleic acid, starch and clay such as kaolin was synthesized with free radical solution polymerization by using ammonium persulfate/ N,N,N ′ ,N ′ - tetramethylethylenediamine as redox initiating pair in the presence of poly(ethylene glycol)diacrylate as a crosslinker. Surface morphology was characterized by the scanning electron microscopy technique. FT-IR analysis was used to identify the presence of different repeating units in the semi-interpenetrating polymer networks (semi-IPNs). Some swelling and diffusion characteristics were calculated for different semi-IPNs and hydrogels prepared under various formulations. The hydrogels were used in experiments on sorption of water-soluble cationic dye such as toluidine blue. Sorption of toluidine blue into the polymeric systems was studied by the batch sorption technique at 25 °C. Water uptake and dye sorption properties of the crosslinked polymeric systems were investigated as a function of chemical composition of the hydrogels.