Fabrication of amino functionalized benzene-1,4-dicarboxylic acid facilitated cerium based metal organic frameworks for efficient removal of fluoride from water environment

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Abstract
In this present work, we have developed the highly porous nature of cerium (Ce) assisted by amine functionalized benzene-1,4-dicarboxylic acid (ABDC) and benzene-1,4-dicarboxylic acid (BDC) based metal organic frameworks (MOFs), namely Ce@ABDC and Ce@BDC MOFs, using a hydrothermal technique for the defluoridation of water. The synthesized Ce@BDC and Ce@ABDC MOFs have improved fluoride adsorption quantities (qe) of 4.88 and 4.91 mg g−1, respectively. The various defluoridation influencing factors such as solution pH, shaking time, Ce-based MOF dosage, temperature and rival anions were explored at a batch scale. The physicochemical properties of Ce-based MOFs were examined by X-ray photoelectron spectroscopy (XPS), Fourier transformer infra-red (FTIR), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), thermogravimetric analysis (TGA), energy dispersive X-ray analysis (EDAX) and powder X-ray diffraction (PXRD) studies. The obtained experimental data of fluoride adsorption onto Ce-based MOFs were best fitted with various isotherm and kinetic models. Thermodynamic parameters indicate the spontaneity and endothermic nature of fluoride sorption. The results of a field trial and recyclability of Ce-based MOFs show that Ce-based MOFs are suited to field conditions and are regenerable up to six cycles.
Funding Information
  • Deputyship for Research & Innovation, "Ministry of Education" in Saudi Arabia (IFKSURG-1436-034)

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