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Toxic Metals Biosorption by Jatropha curcas Deoiled Cake: Equilibrium and Kinetic Studies
Author(s) -
Rawat Anand P.,
Rawat Monica,
Rai J. P. N.
Publication year - 2013
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143013x13596524515861
Subject(s) - biosorption , chemistry , freundlich equation , sorption , adsorption , jatropha curcas , human decontamination , aqueous solution , nuclear chemistry , desorption , wastewater , environmental engineering , waste management , organic chemistry , botany , engineering , biology
The equilibrium sorption of Cr(VI) and Cu(II) from aqueous solution using Jatropha curcas deoiled cake, has been studied with respect to adsorbent dosage, contact time, pH, and initial metal concentration in batch mode experiments. Removal of Cu(II) by deoiled cake was greater than that of Cr(VI). The adsorbent chemical characteristics, studied by Fourier transform–infrared analysis, suggested that the presence of Cr(VI) and Cu(II) in the biomass influenced the bands corresponding to hydroxyl and carboxyl groups. Desorption studies revealed that maximum metals recovery was achieved by HNO 3 followed by CH 3 COOH and HCl. The Freundlich isotherm model showed good fit to the equilibrium adsorption data. The adsorption kinetics followed the pseudo‐second‐order model, which provided the best correlation for the biosorption process, and suggested that J. curcas deoiled cake can be used as an efficient biosorbent over other commonly used sorbents for decontamination of Cr(VI)‐ and Cu(II)‐containing wastewater.