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Adsorption of chromium(VI) metal ions from aqueous solution using hexagonal ZnO particles: Equilibrium, kinetic and thermodynamic modelling studies
Author(s) -
Erduran Nuran,
Gökgöz Murat,
Ada Kezban
Publication year - 2014
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21836
Subject(s) - aqueous solution , adsorption , chromium , equilibrium constant , chemistry , zinc , zinc nitrate , inorganic chemistry , metal ions in aqueous solution , metal , langmuir adsorption model , langmuir , precipitation , thermodynamics , organic chemistry , physics , meteorology
Zinc oxide powders having hexagonal plate particles were prepared by homogeneous precipitation from boiling aqueous solutions that contained excess urea and 0.075 (Z075) and 0.300 (Z300) M Zn 2+ . The equilibrium, kinetic and thermodynamics of the adsorption of chromium (VI) from aqueous solution onto Z075 and Z300 were investigated. Thermodynamic parameters and K # equilibrium constant of activation were calculated. Langmuir, Temkin and Dubinin–Radushkevich (D–R) isotherm models were used to describe the adsorption of Cr(VI) onto ZnO powders. The monomolecular adsorption capacity of Z075 and Z300 was determined as 980 and 1050 mg g −1 for Cr(VI), respectively.