Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 79, Issue 1-2, Pages 117-131Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-3894(00)00234-X
Keywords
endothermic; adsorption; isotherm; desorption; regeneration
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The ability of fruit peel of orange to remove Zn, Ni, Cu, Pb and Cr from aqueous solution by adsorption was studied. The adsorption was in the order of Ni(II) > Cu(II) > Pb(II) > Zn(II) > Cr(II). The extent of removal of NI(II) was found to be dependent on sorbent dose, initial concentration, pH and temperature. The adsorption follows first-order kinetics. The process is endothermic showing monolayer adsorption of Ni(II), with a maximum adsorption of 96% at 50 degreesC for an initial concentration of 50 mg l(-1) at pH 6. Thermodynamic parameters were also evaluated. Desorption was possible with 0.05 M HCl and was found to be 95.83% in column and 76% in batch process, respectively. The spent adsorbent was regenerated and recycled thrice. The removal and recovery was also done in wastewater and was found to be 89% and 93.33%, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.
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