title: Gellan gum-g-N-vinyl-2-pyrrolidone: synthesis, swelling, metal ion uptake and flocculation behavior.
abstract: The synthesis of graft copolymer (gellan gum-g-N-vinyl-2-pyrrolidone) is carried out in nitrogen atmosphere using potassium bromate and silver as redox system. The reaction conditions for maximum grafting have been optimized by varying the reaction variables, including the concentration of N-vinyl-2-pyrrolidone (12.0 × 10(--2) to 28 × 10(--2) mol dm(-3)), potassium bromate (6 × 10(-3) to 22 × 10(-3) mol dm(-3)), silver (2.4 × 10(-3)to 5.6 × 10(-3) mol dm(-3)), sulphuric acid (2.0 × 10(-3) to 10 × 10(-3) mol dm(-3)), gellan gum (0.6-1.4 g dm(-3)) along with time duration (60 to 180 min) and temperature (30-50 °C).Water swelling capacity, metal ion sorption and flocculation studies of synthesized graft copolymer have been performed with respect to the parent polymer. The graft copolymer has been characterized by FTIR spectroscopy and thermogravimetric analysis.
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
authors.forename: Shiv Kumar
authors.initials: SK
authors.lastname: Verma
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India.
authors.forename: Vijay Shankar
authors.initials: VS
authors.lastname: Pandey
authors.affiliation: Polymer Science Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India. Electronic address: kunjbehari1234@rediffmail.com.
authors.forename: Mithilesh Yadav Kunj
authors.initials: MY
authors.lastname: Behari
mesh_terms: D000327:Adsorption; D001959:Bromates / Q000737:chemistry; D003031:Coal; D005427:Flocculation; D007477:Ions; D008670:Metals / Q000737:chemistry*; D009391:Nephelometry and Turbidimetry; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D011760:Pyrrolidinones / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D001959:Bromates; D003031:Coal; D007477:Ions; D008670:Metals; D011135:Polysaccharides, Bacterial; D011760:Pyrrolidinones; C019536:potassium bromate; C048288:gellan gum; C042670:N-vinyl-2-pyrrolidinone
keywords: Graft copolymer, Thermal analysis, Metal ion uptake, Water swelling behavior, Flocculation