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Water-stable zirconium and iron-based metal-organic frameworks (MOFs) as fluoride scavengers in aqueous medium.
- Source :
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Separation & Purification Technology . Sep2021, Vol. 270, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
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Abstract
- [Display omitted] • MIL-53 (Fe), UIO-66, acid promoted UIO-66, and MOF-235 synthesized hydrothermally. • Fluoride (F-) uptake preference for MOFs observed in the order of MIL-53 (Fe) > UIO-66 > AP-UIO-66 > MOF-235. • The optimal operating condition was explored by Box–Behnken design (BBD). • The q max of MIL-53 (Fe) for F- was 72.51 mg/g, more than many reported MOFs. Metal-organic frameworks (MOFs) of different water-stable classes were prepared hydrothermally and studied for fluoride (F-) capture in aqueous medium. In the screening test, the (F-) removal for MIL-53 (Fe), UIO-66, AP -UIO-66, and MOF-235 were 95.6%, 92.3%, 74.1% and 61.5%, respectively. MIL-53 (Fe) further explored by Box–Behnken design (BBD) approach to develop a mathematical model for the prediction of F- removal under determined environmental conditions. The model demonstrated that the mixing time was the most significant operational variable in the process. To maximize the F- capture, model optimization carried out and the best operational condition obtained as pH 4, mixing time of 60 min, and MIL-53 (Fe) dosage 0.25 g/L. Monolayer adsorption onto energetically equivalent sorption sites described the F- capture by MIL-53 (Fe). The qmax obtained by non-linear Langmuir model was 3.82 mmol F- per g MIL-53 (Fe). The sorption was favorable at the different F- concentrations in the range of 10–30 mg/L, based on the separation factor. Moreover, the kinetic models revealed that the rate of adsorption controlled by the migration of F- ions through the boundary layer. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13835866
- Volume :
- 270
- Database :
- Academic Search Index
- Journal :
- Separation & Purification Technology
- Publication Type :
- Academic Journal
- Accession number :
- 150289707
- Full Text :
- https://doi.org/10.1016/j.seppur.2021.118645