Abstract
In the present study ion exchange of Pb2+, Cu2+, Fe3+ and Cr3+ on natural clinoptilolite is examined at 27±1°C and initial concentration of 10meq/dm3. Equilibrium is favorable for Pb2+, unfavorable for Cu2+ and sigmoid for Cr3+ and Fe3+. Selectivity series deduced from equilibrium isotherms is Pb2+>Cr3+>Fe3+>Cu2+, while when maximum exchange levels (MELs) are considered, selectivity series is Pb2+>Cr3+≅Cu2+≥Fe3+. Cu2+ manifests the higher value of diffusion coefficient in the clinoptilolite particles among the metals studied, equal to 1.40×10-9cm2/s. According to the fixed bed experiments the upflow rate (5-15 Bed Volumes (BV)) is influencing the breakthrough point for all metals studied. The breakthrough point varies between 12.3BV for Pb2+ and 1.18 for Cu2+. Flow rate is also influencing the operating capacity, giving values between 0.433meq/gclinoptilolite for Pb2+ and 0.053 for Fe3+. Breakthrough point values confirm the selectivity order deduced from the equilibrium isotherms, while operating capacity values confirm the selectivity order deduced from MEL experiments.
| Original language | English |
|---|---|
| Pages (from-to) | 2784-2792 |
| Number of pages | 9 |
| Journal | Water Research |
| Volume | 36 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2002 |
| Externally published | Yes |
Fingerprint
Keywords
- Clinoptilolite
- Fixed beds
- Heavy metals
- Ion exchange
ASJC Scopus subject areas
- Earth-Surface Processes
Cite this
Equilibrium and kinetic ion exchange studies of Pb2+, Cr3+, Fe3+ and Cu2+ on natural clinoptilolite. / Inglezakis, V. J.; Loizidou, M. D.; Grigoropoulou, H. P.
In: Water Research, Vol. 36, No. 11, 2002, p. 2784-2792.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Equilibrium and kinetic ion exchange studies of Pb2+, Cr3+, Fe3+ and Cu2+ on natural clinoptilolite
AU - Inglezakis, V. J.
AU - Loizidou, M. D.
AU - Grigoropoulou, H. P.
PY - 2002
Y1 - 2002
N2 - In the present study ion exchange of Pb2+, Cu2+, Fe3+ and Cr3+ on natural clinoptilolite is examined at 27±1°C and initial concentration of 10meq/dm3. Equilibrium is favorable for Pb2+, unfavorable for Cu2+ and sigmoid for Cr3+ and Fe3+. Selectivity series deduced from equilibrium isotherms is Pb2+>Cr3+>Fe3+>Cu2+, while when maximum exchange levels (MELs) are considered, selectivity series is Pb2+>Cr3+≅Cu2+≥Fe3+. Cu2+ manifests the higher value of diffusion coefficient in the clinoptilolite particles among the metals studied, equal to 1.40×10-9cm2/s. According to the fixed bed experiments the upflow rate (5-15 Bed Volumes (BV)) is influencing the breakthrough point for all metals studied. The breakthrough point varies between 12.3BV for Pb2+ and 1.18 for Cu2+. Flow rate is also influencing the operating capacity, giving values between 0.433meq/gclinoptilolite for Pb2+ and 0.053 for Fe3+. Breakthrough point values confirm the selectivity order deduced from the equilibrium isotherms, while operating capacity values confirm the selectivity order deduced from MEL experiments.
AB - In the present study ion exchange of Pb2+, Cu2+, Fe3+ and Cr3+ on natural clinoptilolite is examined at 27±1°C and initial concentration of 10meq/dm3. Equilibrium is favorable for Pb2+, unfavorable for Cu2+ and sigmoid for Cr3+ and Fe3+. Selectivity series deduced from equilibrium isotherms is Pb2+>Cr3+>Fe3+>Cu2+, while when maximum exchange levels (MELs) are considered, selectivity series is Pb2+>Cr3+≅Cu2+≥Fe3+. Cu2+ manifests the higher value of diffusion coefficient in the clinoptilolite particles among the metals studied, equal to 1.40×10-9cm2/s. According to the fixed bed experiments the upflow rate (5-15 Bed Volumes (BV)) is influencing the breakthrough point for all metals studied. The breakthrough point varies between 12.3BV for Pb2+ and 1.18 for Cu2+. Flow rate is also influencing the operating capacity, giving values between 0.433meq/gclinoptilolite for Pb2+ and 0.053 for Fe3+. Breakthrough point values confirm the selectivity order deduced from the equilibrium isotherms, while operating capacity values confirm the selectivity order deduced from MEL experiments.
KW - Clinoptilolite
KW - Fixed beds
KW - Heavy metals
KW - Ion exchange
UR - http://www.scopus.com/inward/record.url?scp=0036599523&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036599523&partnerID=8YFLogxK
U2 - 10.1016/S0043-1354(01)00504-8
DO - 10.1016/S0043-1354(01)00504-8
M3 - Article
C2 - 12146866
AN - SCOPUS:0036599523
VL - 36
SP - 2784
EP - 2792
JO - Water Research
JF - Water Research
SN - 0043-1354
IS - 11
ER -