title: Rapid adsorptive removal of toxic Pb(2+) ion from aqueous solution using recyclable, biodegradable nanocomposite derived from templated partially hydrolyzed xanthan gum and nanosilica.
abstract: This work studied the application of a novel biodegradable nanocomposite based on partially hydrolyzed polyacrylamide grafted xanthan gum and nanosilica (h-XG/SiO2) towards efficient and rapid removal of toxic Pb(2+) ions from aqueous environment. The uptake ability of Pb(2+) using h-XG/SiO2 has been studied in batch adsorption experiments with variation of adsorption parameters. The excellent removal rate (99.54% adsorption within 25min) and superior adsorption capacity (Qmax=1012.15mgg(-1)) of the composite material have been explained on the basis of synergistic and chelating effects of h-XG/SiO2 with Pb(2+) ion through electrostatic interactions. The kinetics, isotherm and thermodynamics studies reveal that Pb(2+) adsorb rapidly on nanocomposite surface, which is in agreement with pseudo-second-order kinetics and Langmuir adsorption isotherm models. In consequence of excellent adsorption as well as regeneration characteristics of nanocomposite, it has been found to be a promising adsorbent towards removal of Pb(2+) ions from battery industry wastewater.
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India.
authors.forename: Soumitra
authors.initials: S
authors.lastname: Ghorai
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India.
authors.forename: Amit Kumar
authors.initials: AK
authors.lastname: Sarkar
authors.affiliation: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India. Electronic address: pal.s.ac@ismdhanbad.ac.in.
authors.forename: Sagar
authors.initials: S
authors.lastname: Pal
mesh_terms: D000327:Adsorption; D063566:Biodegradable Plastics / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry* / Q000633:toxicity; D008956:Models, Chemical; D053761:Nanocomposites / Q000737:chemistry*; D011135:Polysaccharides, Bacterial; D012822:Silicon Dioxide; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity; D018508:Water Purification / Q000379:methods*
chemical_list: D063566:Biodegradable Plastics; D011135:Polysaccharides, Bacterial; D014874:Water Pollutants, Chemical; D007854:Lead; D012822:Silicon Dioxide; C002563:xanthan gum
keywords: Adsorption; Battery industry effluent; Biodegradable nanocomposite; Xanthan gum