Synthesis of metal–organic frameworks (MOFs) MIL-100(Fe) functionalized with thioglycolic acid and ethylenediamine for removal of eosin B dye from aqueous solution

Abstract

The interaction of eosin B dye from aqueous solution with MIL-100(Fe) and functionalized MIL-100(Fe) metal–organic frameworks (MOFs) is reported in this study. MIL-100(Fe) was prepared and functionalized with thioglycolic acid (TH) and ethylenediammine (ED) separately by incorporating the thiol (–SH) and the amine (–NH2) group of the functionalizing agents into the open metal sites of the MIL-100(Fe) to obtain the acidic (TH-MIL-100) and basic (ED-MIL-100) forms of the MOF respectively. Characterization of the MOFs was done by melting point analysis, elemental analysis, spectroscopic techniques, scanning electron microscopy (SEM), and powdered X-ray diffraction (PXRD) analysis. The adsorption experiments were carried out at different conditions such as pH, adsorbent dosage, contact time, temperature, and initial concentration of the dye to estimate the optimum conditions and the maximum adsorption capacities. Adsorption capacities were observed to increase in the order of ED-MIL-100 < MIL-100 < TH-MIL-100, while the TH-MIL-100 was the most effective in the removal process due to acid–base interaction between the acidic thiol group (–SH) and the alkaline medium of eosin B dye solution. The Langmuir Isotherm was seen to fit well to adsorption data obtained for all three adsorbent materials studied, and adsorption processes followed the pseudo-second order kinetics. This study, therefore, indicates the suitability of functionalization of MIL-100(Fe) towards improving its adsorption capacity.

Ultrasonic controllable synthesis of sulfur-functionalized metal–organic frameworks (S-MOFs) and their application in piezo-photocatalytic rapid reduction of hexavalent chromium (Cr)

“…This suggests that the coordination of the metal site Bi and the carboxylate group (–COOH) causes all the functional groups in the thiophene ring to shift to lower wavenumbers, which is also due to the change in vibration intensity and frequency [46] , [49] . Near 800 cm −1 , there are two peaks with low intensity, which are generally attributed to the vibration of metal–oxygen bonds (M−O) [23] , [29] , [46] . For the Bi-TDC system, they are the stretching vibrations of Bi-O bonds, and the two small peaks correspond to the two different chemical environments of Bi-O bonds [37] , [49] , which are consistent with the two coordination modes of bridging and terminal coordination mentioned above [15] , [19] , [50] .…”

“…Thiophene-2,5-dicarboxylic acid (H 2 TDC) is a heterocyclic organic compound with a thiophene ring and two carboxylic acid groups [23] . It can serve as a bridging ligand for metal–organic frameworks (MOFs), which are porous materials consisting of metal ions and organic linkers [24] .…”

TMU‐24 (Zn‐based MOF) as an advance and recyclable adsorbent for the efficient removal of eosin B: Characterization, equilibrium, and thermodynamic studies

“…As can be seen in Table 3, the developed method of this study was also compared with previously reported methods for EB removal. According to the comparative investigation, all the compared factors for EB removal using synthesized TMU‐24 is quite competitive or even better than the other available adsorbent materials 1,47–53 …”

Material MOFs (Metal Organic Frameworks) dalam Aplikasi Fotokatalisis: Mini Review

“…Analisis difraksi sinar-X diperlukan MOFs untuk menentukan kristalisasi serta pembentukan komposit dan ikatan heterojunction yang terjadi. [46]. Jadi, dari analisis difraksi sinar-X juga dapat mengindikasikan keberhasilan fungsionalisasi MOFs melalui pergeseran puncak difraksi.…”

“…Tella et al (2021) berhasil mensintesis MOFs MIL-100 dengan menggunakan metode refluks dimana hasil pemindaian SEM ditunjukkan Gambar 10(a). MIL-100 memiliki morfologi permukaan kristalin halus sebelum dilakukan modifikasi dan setelah dimodifikasi berubah menjadi kasar (Gambar 10(b)) akibat adanya distorsi pada kerangka MOFs termodifikasi [46]. Kemudian, Chen et al (2019) berhasil mensintesis MOFs berbasis MIL-100 dan MIL-101 dengan metode hidrotermal.…”