Abstract
Background
Phosphate (PO43−) 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. PO43− adsorption from synthetic solutions using ZIF-67 in batch mode were evaluated and a polynomial model (R2: 0.99, R2adj: 0.98, LOF: 0.1433) developed using response surface methodology (RSM).
Results
The highest PO43− 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 PO43− concentration in which highest PO43− removal and lowest adsorbent utilization occurs, observed at 30 mg/L. PO43− removal eclipsed significantly in the presence of carbonate. The equilibrium and kinetic models showed that PO43− adsorbed in monolayer (qmax: 92.43 mg/g) and the sorption process controlled in the sorption stage. Adsorption was also more favorable at higher PO43− concentration, according to the separation factor (KR) graph. Thermodynamic parameters (minus signs of ∆G°, ∆H° of 0.179 KJ/mol and ∆S° of 44.91 KJ/mol.K) demonstrate the spontaneous, endothermic and physisorption nature of the process.
Conclusion
High adsorption capacity and adsorption rates, make ZIF-67 a promising adsorbent for PO43− removal from aqueous environment.
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Acknowledgements
The authors would like to appreciate the financial support provided by Ilam University of Medical Science, Iran (Grant Number: 974001-14).
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Mazloomi, S., Yousefi, M., Nourmoradi, H. et al. Evaluation of phosphate removal from aqueous solution using metal organic framework; isotherm, kinetic and thermodynamic study. J Environ Health Sci Engineer 17, 209–218 (2019). https://doi.org/10.1007/s40201-019-00341-6
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DOI: https://doi.org/10.1007/s40201-019-00341-6