J Hazard Mater. 2015 May 30;289:1-8. doi: 10.1016/j.jhazmat.2015.02.032. Epub 2015 Feb 12.
The removal of caesium ions using supported clinoptilolite.
Erratum in
- J Hazard Mater. 2016 Feb 13;303:181. Al-Joubori, S [corrected to Al-Jubouri, S].
Abstract
In
this paper, the sorptive kinetic and diffusional characteristics of
caesium ion removal from aqueous solution by carbon-supported
clinoptilolite composites are presented. Natural
clinoptilolite
was supported on carbonaceous scaffolds prepared from date stones.
Thermal treatment was applied to produce voids in the carbon which was
conditioned using polydiallyldimethylammonium chloride to facilitate the
clinoptilolite attachment. This method allowed the formation of a consistent
zeolite
layer on the carbon surface. The composite was applied in the removal
of non-radioactive caesium ions showing an enhanced uptake from 55 mg
g(-1) to 120.9 mg g(-1) when compared to
clinoptilolite. Kinetic studies using Pseudo First Order model revealed an enhanced rate constant for carbon-
clinoptilolite (0.0252 min(-1)) in comparison with
clinoptilolite (0.0189 min(-1)). The Pseudo-First Order model described the process for carbon-
clinoptilolite, meanwhile Pseudo Second Order model adjusted better for pure
clinoptilolite.
Diffusivity results suggested that mass transfer resistances involved
in the Cs(+) sorption are film and intraparticle diffusion for natural
clinoptilolite and intraparticle diffusion as the mechanism that controls the process for carbon-
clinoptilolite
composite. The most significant aspect being that the vitrified volume
waste can be reduced by over 60% for encapsulation of the same quantity
of caesium due to the enhanced uptake of
zeolite.
