Back to Search
Start Over
Adsorption and desorption of 2,4,6-trichlorophenol onto and from ash as affected by Ag+, Zn2+, and Al3+
- Source :
- Environmental Science and Pollution Research. 21:2002-2008
- Publication Year :
- 2013
- Publisher :
- Springer Science and Business Media LLC, 2013.
-
Abstract
- Metal cations and organic pollutants mostly co-exist in the natural environment. However, their interactions in adsorption processes have yet to be adequately addressed. In the current study, the effect of inorganic cations with different charges (Ag(+), Zn(2+), and Al(3+)) on the adsorption and desorption of 2,4,6-trichlorophenol (TCP) onto and from processed ash derived from wheat (Triticum aestivum L.) straw was investigated. The adsorption and desorption of TCP were both nonlinear; the isotherm and kinetics curves fitted well using the Freundlich equation and a pseudo-second-order model, respectively. The presence of Ag(+) promoted TCP adsorption, while Zn(2+) and Al(3+) reduced TCP adsorption onto ash. The desorption of TCP from ash showed obvious hysteresis, and the presence of Ag(+), Zn(2+), and Al(3+) caused the desorption to be less hysteretic. The suppression of TCP adsorption by Zn(2+) and Al(3+) was ascribed to the partial overlapping of adsorption groups between TCP and metal ions. Al(3+) had a stronger inhibition effect than that of Zn(2+) due to its higher binding capacity and larger hydrated ionic radius than those of Zn(2+). Enhanced adsorption of TCP onto ash by Ag(+) was ascribed to its ability to reduce the competitive adsorption of water molecules on ash surface by replacing the original ions, such as Na(+) and Ca(2+), and compressing the hydrated ionic radius of these metal ions. In addition, Ag(+) was able to bind with the aromatic organic compounds containing π-electrons, which resulted in a further increase of TCP adsorption by ash.
- Subjects :
- Silver
Health, Toxicology and Mutagenesis
Metal ions in aqueous solution
Inorganic chemistry
chemistry.chemical_element
Zinc
Coal Ash
Metal
Adsorption
Cations
Desorption
Environmental Chemistry
Freundlich equation
Qualitative inorganic analysis
Ionic radius
General Medicine
Pollution
Kinetics
chemistry
Metals
visual_art
visual_art.visual_art_medium
Aluminum
Chlorophenols
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....bb7a9664fd1599cde0e07c5230c082d9