title: Preparation of poly(acrylamide-co-acrylic acid)-grafted gum and its flocculation and biodegradation studies.
abstract: Biodegradation studies of Gum ghatti (Gg) and acrylamide-co-acrylic acid based flocculants [Gg-cl-poly(AAm-co-AA)] have been reported using the soil composting method. Gg-cl-poly(AAm-co-AA) was found to degrade 89.76% within 60 days. The progress of biodegradation at each stage was monitored through FT-IR and SEM. Polymer was synthesized under pressure using potassium persulphate-ascorbic acid as a redox initiator and N,N'-methylene-bis-acrylamide as a crosslinker. Synthesized polymer was found to show pH, temperature and ionic strength of the cations dependent swelling behavior. Gg-cl-poly(AAm-co-AA) was utilized for the selective absorption of saline from different petroleum fraction-saline emulsions. The flocculation efficiency of the polymer was studied as a function of polymer dose, temperature and pH of the solution. Gg-cl-poly(AAm-co-AA) showed maximum flocculation efficiency with 20 mol L(-1) polymer dose in acidic medium at 50 °C.
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, South Africa. mittal.hemant5@gmail.com
authors.forename: H
authors.initials: H
authors.lastname: Mittal
authors.forename: Shivani B
authors.initials: SB
authors.lastname: Mishra
authors.forename: A K
authors.initials: AK
authors.lastname: Mishra
authors.forename: B S
authors.initials: BS
authors.lastname: Kaith
authors.forename: R
authors.initials: R
authors.lastname: Jindal
authors.forename: S
authors.initials: S
authors.lastname: Kalia
mesh_terms: D000042:Absorption; D000178:Acrylamides / Q000737:chemistry* / Q000378:metabolism*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D010578:Petroleum / Q000032:analysis; D053149:Plant Gums / Q000378:metabolism*; D013696:Temperature
chemical_list: D000178:Acrylamides; D010578:Petroleum; D053149:Plant Gums; C431184:poly(acrylamide-co-acrylic acid); C015253:gum ghatti
keywords: Biodegradation; Flocculation; Gum ghatti; Hydrogel; Swelling