13 research outputs found
Modification of Natural Zeolite by Carboxylate Compounds and Minerals for Removal of Zinc Ions from Wastewater: Equilibrium and Kinetic Studies
Cadmium (II) Adsorption from Aqueous Solutions Using Onion Skins
Staff PublicationThe potential of onion skins for removal of aqueous Cd(II) was investigated. Onion skin
powder was chemically modified using thioglycolic acid to develop a suitable, low-cost, and
efficient adsorbent for the removal of Cd(II) from aqueous solutions. Influences of temperature,
contact time, initial concentration of Cd(II), adsorbent dosage, and pH on the removal of Cd(II)
were probed. Optimal adsorption conditions were found at pH 5 and 4, and at 60- and 30-min
equilibrium time for the modified and native onion skins, respectively. The equilibrium process
was well described by the Freundlich isotherm model. The maximum Cd(II) adsorption
capacities, from the Langmuir model, are 17.86 mg/g (modified) and 21.28 mg/g (native). The
adsorption process followed the mechanism of physisorption. Pseudo second-order rate equation
fitted the kinetic data better than the pseudo first-order rate equation for the two adsorbents.
Thermodynamic parameters, such as standard free energy change (ΔG°), standard enthalpy
change (ΔH°), and standard entropy change (ΔS°), were calculated for adsorption experimental
studies. The results showed that the adsorption of Cd(II) on native/unmodified and modified
onion skins was a feasible process and exothermic under the studied conditions. The Cd(II)
adsorbed was efficiently desorbed from adsorbent using 0.3 M HCl