Design of Amino-Functionalized Benzene-1,4-Dicarboxylic Acid-Fabricated Lanthanum-Based Metal–Organic Frameworks for Defluoridation of Water

Abstract

The present work is focused on the hydrothermal fabrication of lanthanum (La)-based metal−organic frameworks (MOFs) with the linkers of benzene-1,4-dicarboxylic acid (BDC) and amine-functionalized BDC, namely, 2-aminobenzene-1,4-dicarboxylic acid (ABDC), which are abbreviated as La@BDC and La@ABDC, respectively. The developed La@BDC and La@ABDC MOF composites were utilized for defluoridation of water. The defluoridation capacities (DCs) of the La@BDC and La@ABDC MOF composites were found to be 4920 and 4950 mgF − kg −1 , respectively. The influencing parameters of adsorption method, such as contact time, initial fluoride solution, MOF dosage, adsorbate pH, rivalry anions, and temperature, were investigated by batch scale. The structural and surface properties of the synthesized La@BDC and La@ABDC MOF composites were explored by powder Xray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), Brunauer−Emmett− Teller (BET) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM) with selected area electron diffraction (SAED), energy-dispersive X-ray analysis (EDAX), and X-ray photoelectron spectroscopy (XPS). The best-fit model was found for both isotherms and kinetic studies for fluoride adsorption onto La-based MOF composites. Thermodynamic studies show the endothermic and spontaneous nature of fluoride adsorption onto the La@BDC and La@ABDC MOF composites. Furthermore, the La@BDC and La@ABDC MOF composites possess greater DCs even after six cycles in recyclability studies. Effective field study reports showed that the La@BDC and La@ABDC MOF composites are exceptionally encouraging and innovative type of adsorbent materials for defluoridation of contaminated field water.

Macroscopic covalent organic framework architectures for water remediation

“…[16][17][18] MOFs have been widely investigated for their excellent capturing efficiency towards a diverse type of toxic molecules and ions in water. [19][20][21] While MOFs are composed of metal knots and organic linkers, COFs are organic structures with lightweight elements. In COFs, the pre-designed organic building blocks are connected through strong covalent bonds and are occupied in the designated 2D or 3D order (Fig.…”

Fabrication of Multi-functionalized Graphene Oxide Doped Alginate Hybrid Spheres for Enhanced Fluoride Adsorption

“…The adsorbate pH concentration of 3 to 11 was modified with addition of 0.1 mole of HCl/NaOH. The kinetics and isotherms studies towards fluoride adsorption was conducted with taking different initial adsorbate solution of 8, 10, 12 and 14 mg/L at altered temperatures at 303, 313 and 323 K. The defluoridation capacity (DC) was calculated by following equation (1)…”

“…Fluoride is considered as vital micro-nutrient liable for the bone and dental mineralization. But excess fluoride in drinking water leads to the irremediable disease in human is described as fluorosis [1]. Therefore the tolerable limit of fluoride in drinking water is fixed as 1.5 mg/L as recommended by WHO [2].…”

Facile Preparation of Millimeter‐Sized Sodium Alginate‐Silica Composite Spheres for Highly Selective Adsorption of Heavy Metal Ions

“…The continuing increased industrial wastewater resulting from the rapid development of science and technology causes severe pollution on the global water environment. [1][2][3][4] The nonbiodegradable heavy metal ions are one of the main pollutants in industrial effluents, which are harmful to human health due to the gradual accumulation in the ecological environment. [5,6] Pb(II) and Ag(I) are the most toxic contaminants among the various heavy ions widely involved in industries.…”