Journal
APPLIED CLAY SCIENCE
Volume 127, Issue -, Pages 35-43Publisher
ELSEVIER
DOI: 10.1016/j.clay.2016.03.038
Keywords
Th(IV); Illite; Adsorption; HA; Ionic strength; Temperature
Funding
- Foundation Research Funds for Central University [lzujbky-2013-191]
Ask authors/readers for more resources
The adsorption experiments of Th(IV) on illite as a function of time, pH, ionic strength, temperature and humic acid (HA) were investigated using batch experiments. The results showed that adsorption of Th(IV) on illite was strongly dependent on contact time, pH, and temperature and independent on humic acid(HA). The Th(IV) adsorption on illite increases with increasing pH (pH <4.5) and temperature, but decreases with increasing ionic strength at pH < 4.5. Th(IV) adsorption data were successfully described by the pseudo second-order kinetic model and the intraparticle diffusion equation. Langmuir adsorption isotherm model simulated the adsorption process better than Freundlich model. The thermodynamic parameters of enthalpy, entropy and free energy change were calculated and thermodynamic parameters revealed the spontaneity and exothermic nature of adsorption Th(IV) on illite. Th(IV) of adsorption mechanism on illite is outer-sphere surface complexation and ion exchange with Na+/H+ on illite at low pH, whereas inner-sphere surface complexation was the main adsorption mechanism at high pH. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available