title: Sorption kinetics of zinc and nickel on modified chitosan.
abstract: This study was conducted to evaluate the effect of equilibration time on adsorption of zinc [Zn(II)] and nickel [Ni(II)] on pure and modified chitosan beads. The initial adsorption of Zn(II) was high on molybdenum (Mo)-impregnated chitosan beads (MoCB) during the initial 60 min. However, after 240 min, Zn(II) adsorption occurred more on single super phosphate chitosan beads (SSPCB), followed by monocalcium phosphate chitosan beads (MCPCB), untreated pure chitosan beads (UCB), and MoCB. Similarly, Ni(II) adsorption was greatest on MoCB during the initial 60 min. At the conclusion of the experiment (at 240 min), the greatest adsorption was occurred on MCPCB, followed by MoCB, UCB, and SSPCB. Chemical sorption and intra-particle diffusion were probably the dominant processes responsible for Zn(II) and Ni(II) sorption onto chitosan beads. The results demonstrated that modified chitosan beads were effective in adsorbing Zn and Ni and hence, could be used for the removal of these toxic metals from soil.
authors: Centre for Environmental Risk Assessment and Remediation, Building-X, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. nymphaea7@gmail.com.|Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, Jharkhand, India. nymphaea7@gmail.com.|University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK. nymphaea7@gmail.com.
authors: Nimisha
authors: N
authors: Tripathi
authors: Southern Cross GeoScience, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia.
authors: Girish
authors: G
authors: Choppala
authors: Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, Jharkhand, India.
authors: Raj S
authors: RS
authors: Singh
authors: Centre for Environmental Risk Assessment and Remediation, Building-X, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.|Global Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, The University of Newcastle, University Drive, 2308, Callaghan, NSW, Australia.
authors: Prashant
authors: P
authors: Srivastava
authors: Global Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, The University of Newcastle, University Drive, 2308, Callaghan, NSW, Australia.
authors: Balaji
authors: B
authors: Seshadri
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D004058:Diffusion; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D009532:Nickel / Q000032:analysis* / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D015032:Zinc / Q000032:analysis* / Q000737:chemistry
chemical_list: D012987:Soil; D009532:Nickel; D048271:Chitosan; D015032:Zinc
keywords: Adsorption; Chitosan; Contamination; Heavy metals; Kinetic models