Fumarate-based metal-organic frameworks as a new platform for highly selective removal of fluoride from brick tea

Abstract

Adsorption and removal of fluoride from brick tea is very important but challenging. In this work, two fumarate-based metal-organic frameworks (MOFs) were synthesized for the selective removal of fluoride from brick tea infusion. MOFs were examined for adsorption time, effect of dose, and uptake capacity at different initial concentrations and temperatures. Remarkably, over 80% fluoride removal was achieved by MOF-801 within 5 min at room temperature, while no significant adsorption occurred for the catechins and caffeine in the brick tea infusion. Further, with the use of the Langmuir equation, the maximum fluoride uptake capacity for the nontoxic calcium fumarate (CaFu) MOF was calculated to be as high as 166.11 mg g−1 at 373 K. As observed from FTIR, EDX and XPS results, hydroxyl group in MOFs were substituted by fluoride. This work demonstrates that the novel fumarate-based MOFs are promising materials for the selective removal of fluoride from brick tea infusion.

Chemistry of alkaline earth metals: It is not all ionic and definitely not boring!

“…In another example, 4,4 0sulfonyldibenzoate (SDB) was used to construct another MOF, [Ca (SDB)]ÁH 2 O, able to reversible absorb CO 2 with a good discrimination between CO 2 and N 2 [69]. One special application of a calcium fumarate based MOF, which was synthesized in analogy to a zirconium-based MOF, is its ability to remove undesired fluoride from brick tea infusions [70].…”

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

“…It is constructed from ZrCl 4 and fumaric acid; possess good water stability, large surface area, and UiO-66 type network topology, which have made MOF-801 to be a good adsorbent for the removal of uoride from water. 25 The presence of zirconium-bound hydroxyl groups in the nodes of MOF-801's framework facilitates uoride adsorption by anion-exchange behaviour. In the present study, MOF-801 was synthesized by the solvothermal method and its removal efficiency of uoride from water was investigated.…”

A Microporous Zirconium Metal‐Organic Framework Based on trans‐Aconitic Acid for Selective Carbon Dioxide Adsorption

“…The 3D Zr‐Fumarate is of particular interest due to its UiO‐66 type rigid micropore system . It was reported as a promising material in applications including water harvesting and removal of fluoride contaminant . The incorporation of functional groups into the fumaric acid linker could be attractive for tuning the pore size, shape and chemical environment of the Zr‐Fumarate framework.…”