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

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 (q_e) 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.