TY - JOUR
T1 - Water-stable zirconium and iron-based metal-organic frameworks (MOFs) as fluoride scavengers in aqueous medium
AU - Hossien Saghi, Mohammad
AU - Chabot, Bruno
AU - Rezania, Shahabaldin
AU - Sillanpää, Mika
AU - Akbar Mohammadi, Ali
AU - Shams, Mahmoud
AU - Alahabadi, Ahmad
N1 - Publisher Copyright:
© 2021
PY - 2021/9/1
Y1 - 2021/9/1
N2 - 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.
AB - 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.
KW - Fluoride
KW - MIL-53 (Fe)
KW - Metal-organic framework (MOFs)
KW - Modelling
KW - Non-linear isotherm
UR - http://www.scopus.com/inward/record.url?scp=85104916985&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2021.118645
DO - 10.1016/j.seppur.2021.118645
M3 - Article
AN - SCOPUS:85104916985
SN - 1383-5866
VL - 270
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 118645
ER -