Removal of Cu(II) Ions from Aqueous Solutions by Adsorption onto Natural Bentonites

• DOI: 10.4028/www.scientific.net/ssp.244.205
• Publication Date: 2015-10-29T08:54:29Z
• Authors: Zuzana Melichová; Michaela Handzušová
• Keywords: Endothermic process; Langmuir adsorption model; Bentonite; Standard molar entropy

The removal of Cu (II) ions from aqueous solutions using the adsorption process onto natural Slovak bentonites deposits Jelšový potok, Hliník nad Hronom and Lieskovec has been investigated in this study. experiments were carried out under batch with initial concentration ions, time temperature as variables. A flame atomic absorption spectrometer was used for measuring copper before after adsorption. Adsorption very fast at low coverage equilibrium approached within 30 min. results best fitted pseudo-second order kinetic model. Langmuir Freundlich isotherms applied isotherm coefficients computed. found to fit better experimental data measured bentonites. maximum capacity adsorbents 13.4 43.1 mg g − 1 . effect on solution three different temperatures (293, 303 313 K). Thermodynamic parameters, such standard free energy changes (Δ G o), enthalpy change H o) entropy S calculated constant obtained isotherm. bentonite a spontaneous endothermic process. suggested that are suitable adsorbent material recovery solutions. Comparing is evident more potok.