The removal of heavy metal cations from an aqueous solution using ionic liquids

2014 ◽  
Vol 92 (11) ◽  
pp. 1875-1881 ◽  
Author(s):  
María Antonieta Valdés Vergara ◽  
Irina Victorovna Lijanova ◽  
Natalya Victorovna Likhanova ◽  
David Jaramillo Vigueras ◽  
Octavio Olivares Xometl
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Ionic Liquids ◽  
Metal Cations ◽  
Heavy Metal Cations

scholarly journals Removal of Some Heavy Metal Cations from Aqueous Solution by Adsorption onto Natural Kaolin

2005 ◽  
Vol 23 (7) ◽  
pp. 519-534 ◽  
Author(s):  
H. Ceylan ◽  
T. Şahan ◽  
R. Gürkan ◽  
Ş. Kubilay
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ion ◽  
Metal Cations ◽  
Equilibrium Studies ◽  
Heavy Metal Cations ◽  
Adsorption Removal ◽  
Adsorbate Concentration ◽  
Endothermic Process ◽  
Equilibrium Concentrations

The adsorption removal of some heavy metal cations such as Cu(II), Zn(II) and Co(II) from aqueous solution onto kaolin has been studied using the batch method with initial metal ion concentrations within the range 15–70 mg/l. The percentage adsorption and equilibrium concentrations were determined by means of atomic absorption flame photometry as a function of adsorbate concentration, pH and temperature. Ion-exchange studies showed that over the complete concentration range studied the adsorption ratios for metal cations adsorbed onto kaolin correlated with the linear forms of the Langmuir, Freundlich and Dubinin—Kaganer—Radushkevich (DKR) adsorption isotherms. The cationexchange capacity of kaolin towards each metal ion studied was evaluated. It was found that the adsorption phenomena depended on the charge density and diameter of the hydrated ion. The equilibrium studies demonstrated that the selectivity of the ions followed the sequence Zn(II) > Cu(II) > Co(II) at pH 7.0. Calculation of thermodynamic parameters such as the standard enthalpy (ΔH0), Gibbs free energy (ΔG0) and entropy (ΔS0) showed that the adsorption of the heavy metal ions studied onto kaolin was an endothermic process which was favoured at higher temperatures. These results show that natural kaolin has a considerable potential for the removal of heavy metal cationic species from aqueous solution and wastewater.

Selective Adsorption of Heavy Metal Cations and Anions from their Aqueous Solution Mixture with Hydrogels

2008 ◽  
Vol 33 (2) ◽  
pp. 459-461 ◽  
Author(s):  
Atsuhiko Nishida ◽  
Naofumi Kawamura ◽  
Tetsuaki Nishida ◽  
Satoru Yoshioka ◽  
Kazuhiro Hara
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Selective Adsorption ◽  
Metal Cations ◽  
Heavy Metal Cations
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