A radiotracer study of the adsorption behavior of aqueous Ba(2+) ions on nanoparticles of zero-valent iron.
Recently, iron nanoparticles are increasingly being tested as adsorbents for various types of organic and inorganic pollutants. In this study, nanoparticles of zero-valent iron (NZVI) synthesized under atmospheric conditions were employed for the removal of Ba(2+) ions in a concentration range 10(-3) to 10(-6) M. Throughout the study, (133)Ba was used as a tracer to study the effects of time, concentration, and temperature. The obtained data was analyzed using various kinetic models and adsorption isotherms. Pseudo-second-order kinetics and Dubinin-Radushkevich isotherm model provided the best correlation with the obtained data. Observed thermodynamic parameters showed that the process is exothermic and hence enthalpy-driven.
Celebi
O
O
Department of Chemistry, Bilkent University, 06800 Bilkent, Ankara, Turkey.
Uzüm
C
C
Shahwan
T
T
Erten
H N
HN
D000327:Adsorption; D001464:Barium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D013696:Temperature; D013816:Thermodynamics; D014961:X-Ray Diffraction
D001464:Barium; D007501:Iron