Water-stable zirconium and iron-based metal-organic frameworks (MOFs) as fluoride scavengers in aqueous medium

Mohammad Hossien Saghi, Bruno Chabot, Shahabaldin Rezania, Mika Sillanpää, Ali Akbar Mohammadi, Mahmoud Shams, Ahmad Alahabadi

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number118645
JournalSeparation and Purification Technology
Volume270
DOIs
Publication statusPublished - 1 Sept 2021
Externally publishedYes

Keywords

  • Fluoride
  • MIL-53 (Fe)
  • Metal-organic framework (MOFs)
  • Modelling
  • Non-linear isotherm

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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