Abstract
We conducted kinetic and equilibrium sorption experiments on removal of Zn(II) from aqueous solutions by scoria (a vesicular pyroclastic rock with basaltic composition) from Jeju Island, Korea, in order to examine its potential use as an efficient sorbent. The batch-type kinetic sorption tests under variable conditions indicated that the percentage of Zn(II) removal by scoria increases with decreasing initial Zn(II) concentration, particle size, and sorbate/sorbent ratio. However, the sorption capacity decreases with the decrease of the initial Zn(II) concentration and sorbate/sorbent ratio. Equilibrium sorption tests show that Jeju scoria has a larger capacity and affinity for Zn(II) sorption than commercial powdered activated carbon (PAC); at initial Zn(II) concentrations of more than 10 mM, the sorption capacity of Jeju scoria is about 1.5 times higher than that of PAC. The acquired sorption data are better fitted to the Langmuir isotherm than the Freundlich isotherm. Careful examination of ionic concentrations in sorption batches suggests that the sorption behavior is mainly controlled by cation exchange and typically displays characteristics of 'cation sorption'. The Zn(II) removal capacity decreases when solution pH decreases because of the competition with hydrogen ions for sorption sites, while the Zn(II) removal capacity increases under higher pH conditions, likely due to hydroxide precipitation. At an initial Zn(II) concentration of 5.0 mM, the removal increases from 70% to 96% with the increase of initial pH from 3.0 to 7.0. We recommend Jeju scoria as an economic and efficient sorbent for Zn(II) in contaminated water.
| Original language | English |
|---|---|
| Pages (from-to) | 1416-1426 |
| Number of pages | 11 |
| Journal | Chemosphere |
| Volume | 60 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2005 Sep 1 |
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Keywords
- Cation exchange
- Jeju Island, Korea
- Langmuir and Freundlich isotherms
- Scoria
- Sorption
- Zinc removal
ASJC Scopus subject areas
- Environmental Chemistry
- Environmental Science(all)
Cite this
Sorption of Zn(II) in aqueous solutions by scoria. / Kwon, Jang Soon; Yun, Seong Taek; Kim, Soon Oh; Mayer, Bernhard; Hutcheon, Ian.
In: Chemosphere, Vol. 60, No. 10, 01.09.2005, p. 1416-1426.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sorption of Zn(II) in aqueous solutions by scoria
AU - Kwon, Jang Soon
AU - Yun, Seong Taek
AU - Kim, Soon Oh
AU - Mayer, Bernhard
AU - Hutcheon, Ian
PY - 2005/9/1
Y1 - 2005/9/1
N2 - We conducted kinetic and equilibrium sorption experiments on removal of Zn(II) from aqueous solutions by scoria (a vesicular pyroclastic rock with basaltic composition) from Jeju Island, Korea, in order to examine its potential use as an efficient sorbent. The batch-type kinetic sorption tests under variable conditions indicated that the percentage of Zn(II) removal by scoria increases with decreasing initial Zn(II) concentration, particle size, and sorbate/sorbent ratio. However, the sorption capacity decreases with the decrease of the initial Zn(II) concentration and sorbate/sorbent ratio. Equilibrium sorption tests show that Jeju scoria has a larger capacity and affinity for Zn(II) sorption than commercial powdered activated carbon (PAC); at initial Zn(II) concentrations of more than 10 mM, the sorption capacity of Jeju scoria is about 1.5 times higher than that of PAC. The acquired sorption data are better fitted to the Langmuir isotherm than the Freundlich isotherm. Careful examination of ionic concentrations in sorption batches suggests that the sorption behavior is mainly controlled by cation exchange and typically displays characteristics of 'cation sorption'. The Zn(II) removal capacity decreases when solution pH decreases because of the competition with hydrogen ions for sorption sites, while the Zn(II) removal capacity increases under higher pH conditions, likely due to hydroxide precipitation. At an initial Zn(II) concentration of 5.0 mM, the removal increases from 70% to 96% with the increase of initial pH from 3.0 to 7.0. We recommend Jeju scoria as an economic and efficient sorbent for Zn(II) in contaminated water.
AB - We conducted kinetic and equilibrium sorption experiments on removal of Zn(II) from aqueous solutions by scoria (a vesicular pyroclastic rock with basaltic composition) from Jeju Island, Korea, in order to examine its potential use as an efficient sorbent. The batch-type kinetic sorption tests under variable conditions indicated that the percentage of Zn(II) removal by scoria increases with decreasing initial Zn(II) concentration, particle size, and sorbate/sorbent ratio. However, the sorption capacity decreases with the decrease of the initial Zn(II) concentration and sorbate/sorbent ratio. Equilibrium sorption tests show that Jeju scoria has a larger capacity and affinity for Zn(II) sorption than commercial powdered activated carbon (PAC); at initial Zn(II) concentrations of more than 10 mM, the sorption capacity of Jeju scoria is about 1.5 times higher than that of PAC. The acquired sorption data are better fitted to the Langmuir isotherm than the Freundlich isotherm. Careful examination of ionic concentrations in sorption batches suggests that the sorption behavior is mainly controlled by cation exchange and typically displays characteristics of 'cation sorption'. The Zn(II) removal capacity decreases when solution pH decreases because of the competition with hydrogen ions for sorption sites, while the Zn(II) removal capacity increases under higher pH conditions, likely due to hydroxide precipitation. At an initial Zn(II) concentration of 5.0 mM, the removal increases from 70% to 96% with the increase of initial pH from 3.0 to 7.0. We recommend Jeju scoria as an economic and efficient sorbent for Zn(II) in contaminated water.
KW - Cation exchange
KW - Jeju Island, Korea
KW - Langmuir and Freundlich isotherms
KW - Scoria
KW - Sorption
KW - Zinc removal
UR - http://www.scopus.com/inward/record.url?scp=23044495903&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23044495903&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2005.01.078
DO - 10.1016/j.chemosphere.2005.01.078
M3 - Article
C2 - 16054911
AN - SCOPUS:23044495903
VL - 60
SP - 1416
EP - 1426
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
IS - 10
ER -