Rapid adsorption of copper(II) and lead(II) by rice straw/Fe₃O₄ nanocomposite: optimization, equilibrium isotherms, and adsorption kinetics study

Rice straw/magnetic nanocomposites (RS/Fe3O4-NCs) were prepared via co-precipitation method for removal of Pb(II) and Cu(II) from aqueous solutions. Response surface methodology (RSM) was utilized to find the optimum conditions for removal of ions. The effects of three independent variables includin...

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Bibliographic Details
Published in:PloS one 2015-03, Vol.10 (3), p.e0120264-e0120264
Main Authors: Khandanlou, Roshanak, Ahmad, Mansor B, Fard Masoumi, Hamid Reza, Shameli, Kamyar, Basri, Mahiran, Kalantari, Katayoon
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Binding sites
Carbon
Cellulose
Chemistry
Copper
Copper - chemistry
Copper compounds
Desorption
Equilibrium
Ferric Compounds - chemistry
Hydrogen-Ion Concentration
Independent variables
Ion concentration
Ions
Iron
Iron oxides
Isotherms
Kinetics
Lead
Lead - chemistry
Magnetics
Metal oxides
Metals
Nanocomposites
Nanocomposites - chemistry
Nanocrystals
Nitrates - chemistry
Optimization
Oryza - growth & development
Oxides - chemistry
Researchers
Response surface methodology
Rice
Rice straw
Science
Straw
Studies
Temperature
Water Pollutants, Chemical - analysis
Water Purification - methods
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Summary:Rice straw/magnetic nanocomposites (RS/Fe3O4-NCs) were prepared via co-precipitation method for removal of Pb(II) and Cu(II) from aqueous solutions. Response surface methodology (RSM) was utilized to find the optimum conditions for removal of ions. The effects of three independent variables including initial ion concentration, removal time, and adsorbent dosage were investigated on the maximum adsorption of Pb (II) and Cu (II). The optimum conditions for the adsorption of Pb(II) and Cu(II) were obtained (100 and 60 mg/L) of initial ion concentration, (41.96 and 59.35 s) of removal time and 0.13 g of adsorbent for both ions, respectively. The maximum removal efficiencies of Pb(II) and Cu(II) were obtained 96.25% and 75.54%, respectively. In the equilibrium isotherm study, the adsorption data fitted well with the Langmuir isotherm model. The adsorption kinetics was best depicted by the pseudo-second order model. Desorption experiments showed adsorbent can be reused successfully for three adsorption-desorption cycles.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0120264