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Mazloomi S, Amarlouie A, Nourmoradi H. Evaluation of phosphate removal from aqueous solution using metal organic framework; isotherm, kinetic and thermodynamic study. Journal title 2019; 1 (4)
URL: http://newresearch.medilam.ac.ir/article-1-340-en.html
URL: http://newresearch.medilam.ac.ir/article-1-340-en.html
Department of Environmental Health, School of Health, Ilam University of Medical sciences, Ilam, Iran
Abstract: (2381 Views)
Background Phosphate (PO4
3−) is the main etiological factor of eutrophication in surface waters. Metal organic frameworks
(MOFs) are novel hybrid materials with amazing structural properties that make them a prominent material for adsorption.
Methods Zeolitic imidazolate framework 67 (ZIF-67), a water stable member of MOFs, with a truncated rhombic dodecahedron
crystalline structure was synthesized in aqueous environment at room temperature and then characterized using XRD and SEM.
PO4
3− adsorption from synthetic solutions using ZIF-67 in batch mode were evaluated and a polynomial model (R2: 0.99,R2
adj:
0.98, LOF: 0.1433) developed using response surface methodology (RSM).
Results The highest PO4
3− removal (99.2%) after model optimization obtained when ZIF-67 dose, pH and mixing time adjusted
to 6.82, 832.4 mg/L and 39.95 min, respectively. The optimum PO4
3− concentration in which highest PO4
3− removal and lowest
adsorbent utilization occurs, observed at 30 mg/L. PO4
3− removal eclipsed significantly in the presence of carbonate. The
equilibrium and kinetic models showed that PO4
3− adsorbed in monolayer (qmax: 92.43 mg/g) and the sorption process controlled
in the sorption stage. Adsorption was also more favorable at higher PO4
3− concentration, according to the separation factor (KR)
graph. Thermodynamic parameters (minus signs of ΔG°, ΔH° of 0.179 KJ/mol and ΔS° of 44.91 KJ/mol.K) demonstrate the
spontaneous, endothermic and physisorption nature of the process.
3−) is the main etiological factor of eutrophication in surface waters. Metal organic frameworks
(MOFs) are novel hybrid materials with amazing structural properties that make them a prominent material for adsorption.
Methods Zeolitic imidazolate framework 67 (ZIF-67), a water stable member of MOFs, with a truncated rhombic dodecahedron
crystalline structure was synthesized in aqueous environment at room temperature and then characterized using XRD and SEM.
PO4
3− adsorption from synthetic solutions using ZIF-67 in batch mode were evaluated and a polynomial model (R2: 0.99,R2
adj:
0.98, LOF: 0.1433) developed using response surface methodology (RSM).
Results The highest PO4
3− removal (99.2%) after model optimization obtained when ZIF-67 dose, pH and mixing time adjusted
to 6.82, 832.4 mg/L and 39.95 min, respectively. The optimum PO4
3− concentration in which highest PO4
3− removal and lowest
adsorbent utilization occurs, observed at 30 mg/L. PO4
3− removal eclipsed significantly in the presence of carbonate. The
equilibrium and kinetic models showed that PO4
3− adsorbed in monolayer (qmax: 92.43 mg/g) and the sorption process controlled
in the sorption stage. Adsorption was also more favorable at higher PO4
3− concentration, according to the separation factor (KR)
graph. Thermodynamic parameters (minus signs of ΔG°, ΔH° of 0.179 KJ/mol and ΔS° of 44.91 KJ/mol.K) demonstrate the
spontaneous, endothermic and physisorption nature of the process.
: Cross sectional |
Subject:
General
Received: 2017/04/7 | Accepted: 2018/03/10 | Published: 2019/04/7
Received: 2017/04/7 | Accepted: 2018/03/10 | Published: 2019/04/7
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