Back to Search
Start Over
Removal of Cd(II), Cu(II), and Pb(II) by adsorption onto natural clay: a kinetic and thermodynamic study
- Source :
- Turkish Journal of Chemistry
- Publication Year :
- 2021
- Publisher :
- The Scientific and Technological Research Council of Turkey (TUBITAK-ULAKBIM) - DIGITAL COMMONS JOURNALS, 2021.
-
Abstract
- In this work, we study the elimination of three bivalent metal ions (Cd2+, Cu2+, and Pb2+) by adsorption onto natural illitic clay (AM) collected from Marrakech region in Morocco. The characterization of the adsorbent was carried out by X-ray fluorescence, Fourier transform infrared spectroscopy and X-ray diffraction. The influence of physicochemical parameters on the clay adsorption capacity for ions Cd2+, Cu2+, and Pb2+, namely the adsorbent dose, the contact time, the initial pH imposed on the aqueous solution, the initial concentration of the metal solution and the temperature, was studied. The adsorption process is evaluated by different kinetic models such as the pseudo-first-order, pseudo-second-order, and Elovich. The adsorption mechanism was determined by the use of adsorption isotherms such as Langmuir, Freundlich, and Temkin models. Experiments have shown that heavy metals adsorption kinetics onto clay follows the same order, the pseudo-second order. The isotherms of adsorption of metal cations by AM clay are satisfactorily described by the Langmuir model and the maximum adsorption capacities obtained from the natural clay, using the Langmuir isotherm model equation, are 5.25, 13.41, and 15.90 mg/g, respectively for Cd(II), Cu(II), and Pb(II) ions. Adsorption of heavy metals on clay is a spontaneous and endothermic process characterized by a disorder of the medium. The values of ΔH are greater than 40 kJ/mol, which means that the interactions between clay and heavy metals are chemical in nature.
- Subjects :
- Langmuir
Aqueous solution
Chemistry
Metal ions in aqueous solution
isotherm
Inorganic chemistry
Langmuir adsorption model
General Chemistry
Endothermic process
Article
Metal
thermodynamic
symbols.namesake
Adsorption
FTIR
adsorption
visual_art
visual_art.visual_art_medium
symbols
Clay
Freundlich equation
heavy metals
Subjects
Details
- ISSN :
- 13036130
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- TURKISH JOURNAL OF CHEMISTRY
- Accession number :
- edsair.doi.dedup.....fa6d0ec4183485cc2609f9019a4aa06d