Preparation of magnetic MIL-101 (Cr) for efficient removal of ciprofloxacin

Abstract

Metal organic frameworks are widely used as adsorbent materials in recent years. In this study, the most prepared metal organic framework MIL-101 was prepared by hydrothermal method and featured magnetic property using co-precipitation method FeO. Then, the prepared composite (MIL-101/FeO) was first characterized using XRD, FTIR, SEM-EDS, and surface area analysis, then was used for the adsorptive removal of the most used antibiotic, ciprofloxacin (CIP). The effect of different adsorption variables which may affect the removal of CIP by MIL-101/FeO was investigated, as well as their adsorbent quantity, initial CIP concentration, pH, temperature, and contact time. The non-linear Langmuir and Freundlich isotherm were applied to experimental data. It was observed that rising solution temperature decreases adsorption efficiency, as the maximum adsorption uptake value was 63.28 mg g at 298 K and 22.93 mg g at 313 K, indicating the exothermic nature of the adsorption. The adsorption was studied kinetically and found to follow the pseudo-second-order kinetic model. The desorption of CIP from the MIL-101/FeO was investigated using three different eluents, and the results showed that phosphate-buffered solution was the most effective desorption eluent. Graphical abstract Schematic diagram of the preparation steps of MIL-101/Fe3O4.

A hollow mesoporous carbon from metal-organic framework for robust adsorbability of ibuprofen drug in water

“…As observed from figure 1c, the appearance of the shifts at around 1456 and 1613 cm -1 is characterized by COO -and aromatic C¼C groups, respectively [44]. Meanwhile, in the MPC structure emerged the typical D-(1320 cm 21 ) and G-(1590 cm 21 ) bands, indicating the defective structural phase, disorder of MPC [26]. Meanwhile, figure 1d discloses the diagnostic plots of pH pzc -one of the very crucial parameters in adsorption, which determine the nature of the surface of a dispersed solid phase at a solid -electrolyte solution interface [45,46].…”

“…[7] reported a database to quantitatively assess the occurrence and removal efficiency of pharmaceuticals and personal care products in wastewater treatment processes from many scientific publications, in which IBU concentrations in the effluents leaving several sewage-treatment plants were found to be between 0.17 and 59.2 mg l 21 . Moreover, ibuprofen concentration reported in effluents in France and Sweden were 7.11 and 85 mg l 21 , respectively [8]. The IBU concentration varies and depends on the geographically polluted regions, and contaminated environment (stream, river, etc.).…”

“…The metal-organic frameworks (MOFs) belong to the crystalline porous materials, assembled by metal clusters and organic linkers [18][19][20]. With their excellent tailorability and versatile functionalities, the MOFs are applicable as promising catalysts, adsorbents and drug delivery systems [18][19][20][21][22][23]. Recently, Fe-based MOFs have been used as promising self-sacrificed templates for in situ preparation of hierarchically porous carbon via pyrolysis under aerobic conditions [24].…”

“…For the experiments of ibuprofen adsorption onto MPC, effects of contact time, MPC dosage, ionic strength, concentration and temperature were systematically investigated. The optimal conditions consisted of pH ¼ 3, concentration 10 mg l 21 and dose of 0.1 g l 21 for the highest ibuprofen removal efficiency up to 88.3% after 4 h. Moreover, adsorption behaviour, whereby chemisorption and monolayer controlled the uptake of ibuprofen over MPC, were assumed. Adsorption mechanisms including H-bonding, p-p interaction, metal-oxygen, electrostatic attraction were rigorously proposed.…”

Tunable Synthesis of Mesoporous Carbons from Fe3O(BDC)3 for Chloramphenicol Antibiotic Remediation

“…The metal–organic frameworks (MOFs) are structurally constructed from metal clusters and organic linkers, they are impressive for their diverse application in many fields as catalysis, adsorption, drug delivery and gas adsorption [ 14 , 15 , 16 , 17 ]. The topology of Fe 3 O(BDC) 3 (Fe-MIL-88B) with iron metal sites connected with 1,4–dicarboxylic acid (H 2 BDC), is representative for the synthesis of MPCs since it possesses an abundance of precious characteristics, particularly in chemical stability, as well as facile synthesis via hydrothermal methods [ 18 , 19 , 20 ].…”