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.
Highlights
Tea is a popular and healthy beverage due to that drinking tea has numerous health benefits, such as lower cardiovascular risk, reduce body fat, as well as decrease the risk of tumors[1,2]
For the adsorption of contaminant-related applications, metal-organic frameworks (MOFs) have been widely exploited for the selective adsorption and removal of toxic dyes[17], pharmaceuticals[18], nitrogen compounds[19], sulfur compounds[20], and heavy metal ions[21], because the pore size and shape of MOFs can be controlled to facilitate the uptake of targeted guest molecules
Zr-based MOF consisting of Zr6 nodes bridged by fumarate linker to give the three dimensional (3D) structure (Fig. 1a)[27]
Summary
Tea is a popular and healthy beverage due to that drinking tea has numerous health benefits, such as lower cardiovascular risk, reduce body fat, as well as decrease the risk of tumors[1,2]. De groups reported a promising aluminium fumarate MOF (AlFu) adsorbent for the removal of fluoride from groundwater[24] These MOFs-based porous adsorbents exhibit fast and excellent adsorption abilities for the fluoride removal from water system. We report two fumarate-based MOFs (i.e., MOF-801 and CaFu) for the highly selective adsorption of fluoride from brick tea infusion. A homologous nontoxic calcium fumarate (CaFu) MOF was synthesized and employed to efficient remove fluoride from tea infusion These fumarate-based MOFs show high efficiency and selectivity towards the fluoride removal, and experimentally simple and easy to handle for the uptake of fluoride by using tea bag model. To the best of our knowledge, this is the first example of MOF-based adsorbents for the selective adsorption of fluoride from brick tea infusion
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