Characterization and Metal Sorption of Gamma Radiation Copolymerization of Acrylic Acid/ Plasticized Starch /Carboxymethyl Cellulose Mixtures

Document Type : Original Article

Authors

1 Radiation Chemistry Department, National Center for Radiation Research and Technology, Atomic Energy Authority, Cairo Egypt.

2 Chemistry Department, College for Girls, Ain Shams University, Cairo, Egypt.+

3 Corresponding author: Abdel Wahab M. El-Naggar.

Abstract

Abstract
Copolymers were prepared by gamma irradiation of acrylic acid (AAc)/plasticized starch (PLST)/carboxymethyl cellulose (CMC) mixtures in aqueous solutions. The effect of AAc ratio and gamma irradiation dose on the gel content, swelling (%) and tensile mechanical properties was investigated. The PAAc-co-PLST/CMC copolymers were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and surface morphology by scanning electron microscopy (SEM). The thermal stability was further investigated by determining the activation energy by three different methods based on Coats-Redfern, Broido and the Horowitz –Metzger approximation equations. As an application, the removal of copper and nickel ions by the copolymer hydrogel was also studied. The results indicated that the graft copolymer hydrogels have higher affinity for Ni+2 than Cu+2 ions.

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