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Kinetics, Thermodynamics, and Competitive Adsorption of Heavy Metals from Water Using Orange Biomass
Author(s) -
SandovalFlores G.,
AlvaradoReyna S.,
ElvirPadilla L.G.,
MendozaCastillo D.I.,
ReynelAvila H.E.,
BonillaPetriciolet A.
Publication year - 2018
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 - 10.2175/106143017x15131012188321
Subject(s) - adsorption , endothermic process , chemistry , metal ions in aqueous solution , metal , langmuir adsorption model , thermodynamics , ion , inorganic chemistry , kinetics , ion exchange , binary system , organic chemistry , binary number , physics , quantum mechanics , arithmetic , mathematics
Adsorption of heavy metals on modified orange biomass has been studied. This biomass was treated with NaOH and CaCl 2 to improve its adsorption properties. Kinetic and thermodynamic studies of the adsorption of Cd 2+ , Ni 2+ , Cu 2+ , and Zn 2+ were performed at different operating conditions, including competitive adsorption studies with binary metallic mixtures. Results show that this adsorption process was endothermic where an ion exchange mechanism played a relevant role. Adsorbent effectiveness decreased in binary solutions, indicating a strong antagonistic adsorption behavior caused by counter‐ions. This antagonistic adsorption was highly dependent on the counter‐ion type and its concentration. Multicomponent adsorption of Cu 2+ ions was not significantly affected by the presence of other metallic counter‐ions, whereas the adsorption of Ni 2+ could be totally suppressed by the other ions. The modeling of binary adsorption isotherms was successful using the modified Langmuir equation, which outperformed the Ideal Absorbed Solution Theory‐Sips and modified Redlich‐Peterson models.