Adsorption of caesium from aqueous solution on binary mixture of iron pillared layered montmorillonite and goethite

作者：Ararem Abderrahmane^*; Bouras Omar; Arbaoui Fand

来源：Chemical Engineering Journal, 2011, 172(1): 230-236.

DOI：10.1016/j.cej.2011.05.095

• Pillared clays
• Montmorillonite
• Goethite
• Caesium
• Adsorption

Caesium adsorption was carried out on two materials namely iron pillared layered montmorillonite (Fe-PILM) and goethite (alpha-FeOOH), and their mixture (Fe-PILM: alpha-FeOOH). The characteristics of these two adsorbents were determined by using X-ray diffraction, Fourier transform infrared spectrum. A set of experiments was done to estimate cation exchange capacities and zero point of charge pH,pc of used materials. Adsorption of Cs as a function of pH, mass fraction of goethite in the mixture, initial concentration and ionic strength was investigated. The kinetic study showed that sorption followed pseudo-first-order kinetics with a good correlation coefficient (R(2)=0.997). Optimal Cs ions elimination was favoured at the pH range 5-9. The obtained results revealed that the maximum adsorption of 93%, took place at 20% composition of goethite in the mixture. The Cs sorption data onto optimal mixture were described using Freundlich. Langmuir and Dubinin-Radushkevich (D-R) models. The thermodynamic parameters Delta H degrees, Delta S degrees and Delta G degrees for the Cs adsorption were determined by using four temperatures (288, 308, 338 and 360 K). Results show that the adsorption process was exothermic and favoured at low temperature.

• 出版日期2011-8-1