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Adsorption of Cadmium from Aqueous Solution by Ficus religiosa Leaf Powder and Characterization of Loaded Biosorbent
Author(s) -
Rao Karanam Srinivasa,
Anand Shashi,
Venkateswarlu Paladugu
Publication year - 2011
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201000098
Subject(s) - adsorption , chemistry , enthalpy , langmuir , aqueous solution , analytical chemistry (journal) , nuclear chemistry , cadmium , freundlich equation , biosorption , ion , chromatography , thermodynamics , organic chemistry , sorption , physics
The present investigation evaluates the adsorption effectiveness of Cd(II) ions on Ficus religiosa leaf powder (FRL). The experimental parameters chosen included time, pH, particle size, temperature, adsorbate, anion, and Pb(II) concentrations. The time data followed pseudo‐second‐order kinetics. Cd(II) adsorption increased from 1.38 to 75.17% with the increase in pH from 2 to 4 and further increase in pH to 5.5 resulted in its marginal increase to 77.52%. Based on regression coefficient values, the isothermic data fitted the various models in the order Langmuir > Redlich–Peterson > Temkin > Freundlich model. The maximum loading capacity of FRL was estimated to be 27.14 mg g −1 . The presence of Cl − , ${\rm SO}_{{\rm 4}}^{2{-} } $ , or Pb 2+ exhibited adverse effect on Cd(II) uptake. The thermodynamic parameters of enthalpy (Δ H 0 ) and entropy (Δ S 0 ) were estimated to be 8.31 kJ mol −1 and 38.22 J mol −1 K −1 , respectively. SEM‐EPMA of the loaded FRL showed Cd(II) distribution at specific sites. The XRD patterns of Cd(II) loaded FRL sample showed disappearance of some peaks corresponding to β‐Ca(PO 3 ) 2 ; shifting of peaks and decrease in %RI corresponding to γ‐CaSO 4 phase. Positive shift of IR bands for the Cd(II) loaded sample was observed.