The synthesis of mesostructured NH2-MIL-101(Cr) and kinetic and thermodynamic study in tetracycline aqueous solutions

Abstract

In this paper, metal-organic framework NH 2 -MIL-101(Cr) was prepared and used as an adsorbent for removing tetracycline from aqueous system. The results showed that NH 2 -MIL-101(Cr) had the better adsorption property for tetracycline. The adsorption capacities for tetracycline reached 36.15 and 48.80 % in 10 and 240 min, respectively. Additionally, the study of adsorption kinetics and thermodynamic theories showed that the adsorption kinetics and thermodynamic datum of tetracycline were adapted to the pseudo-second-order model and the Freundlich model, respectively. In the meantime, the adsorption process was considered as an endothermic process, spontaneous nature of the adsorption and chemical adsorption in dominating station.

Can metal organic frameworks outperform adsorptive removal of harmful phenolic compound 2-chlorophenol by activated carbon?

“…The last two vibrations happen due to the asymmetric and symmetric N-H stretching of the amino group whereas the lower end band is caused by C-N stretching vibration. All signals are in accordance to values reported in literature [39,48].…”

“…As for MOFs, generally, there are three distinct weight loss steps. The first step between 30 • C and 150 • C refers to the loss of moisture adsorbed from air and residual solvents used for washing (EtOH and DMF) from the large cages [48]. Next, strongly adsorbed water molecules are removed from the middle sized cages from • C to 370 • C. Above 370 • C, compounds such as -OH and other coordinated groups are eliminated simultaneously causing MIL-101 framework decomposition [38,39,51,52].…”

NH2-Fe-MILs for effective adsorption and Fenton-like degradation of imidacloprid: Removal performance and mechanism investigation

“…The XRD patterns of the two MOFs (Fig. 2) indicate the typical main diffraction peaks of the structure and are consistent with the data presented in the literatures [34,35]. The characteristic diffraction peaks of the as-prepared NH 2 -MIL-88B(Fe) appeared at approximately 9.2°, 10.2°, (Fig.…”

Adsorption characteristics of metal–organic framework MIL-101(Cr) towards sulfamethoxazole and its persulfate oxidation regeneration

“…Tian et al used functional MOFs to adsorb tetracycline in water and found that the adsorption process conformed to pseudo-second-order kinetics. 15 Jhung et al used MOFs to adsorb benzene in water and the equilibrium adsorption capacity was 16.7 mmol g À1 , 16 which was higher than that of AC at 8.0 mmol g À1 . Hasan et al used MOFs to adsorb naproxen and clobric acid in water, 17 nding that they had higher adsorption capacities and adsorption rate constants than AC.…”