Title: SYNTHESIS OF ORGANO-MONTMORILLONITE/SODIUM ALGINATE GRAFT POLY(ACRYLIC ACID -CO-2-ACRYLAMIDO-2-METHYL-1-PROPANE SULFONIC ACID) SUPERABSORBENT COMPOSITE AND ITS ADSORPTION STUDIES
Page Range: p.417-422
Author(s): Linhui Zhu; Lili Zhang; Yaoji Tang
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 22
Issue No: No. 4
Abstract
A new superabsorbent composite based on the natural material sodium alginate (SA) was synthesised by intercalation graft polymerisation of SA, acrylic acid (AA), 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS) and organo-montmorillonite (OMMT) using ammonium persulphate (APS) as an initiator and N,N’methylenebisacrylamide (MBA) as a cross linker. The composite was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA), and was used to remove heavy metal ions such as Pb2+, Ni2+ and Cu2+ from aqueous solutions. Maximum adsorption capacities for Pb2+, Ni2+ and Cu2+ were 1485, 303 and 294 mg/g respectively. It was found that the adsorption of Pb2+ was consistent with both the Langmuir and the Freundlich model, while that of Ni2+ and Cu2+ was in accordance with the Langmuir model. Mechanisms for the adsorption process were speculated upon. It revealed that chelation was dominant for the adsorption of Pb2+, while ion-exchange played an important role for adsorption of Ni2+ and Cu2+. The superabsorbent composite had good reuse performance in wastewater treatment. 15 Refs.
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