Synthesis and characterization of metal organic framework using succinic acid ligand with cobalt and iron metals as methylene blue dye adsorbent

Abstract

Metal-organic Framework (MOF) as a porous material has a potency for an organic dye adsorbent due to its tunable pore size. It can be a good candidate for selective separation of organic dye waste because of its organic functionality, high thermal and stability. In this study, MOF based on cobalt (Co) and iron (Fe) cations with succinic acid ligand was utilized for Methylene Blue (MB) removal from aqueous solution. Co-MOF and Fe-MOF were synthesized using solvothermal method at 120 °C for 20 h and characterized by using infrared spectroscopy, X-Ray diffraction technique, thermogravimetric analyses, N2 adsorption-desorption isotherm, and scanning electron microscope. The adsorption of MB from aqueous solution by Co-MOF and Fe-MOF were carried out and their adsorption properties were investigated in various parameters such as pH solution, contact time, MOF loading. Moreover, their adsorption isotherm and reusable capacity were explored. As the results, the optimal adsorption was achieved at pH 9 for both MOFs, 5 mg of MOFs loading in 5 mL MB and 180 min for Co-MOF and 150 min for Fe-MOF. Both MOFs could be reused as a good adsorbent with the ratio of ethanol and H2O (70:30) as an eluent. This adsorption activity followed the Langmuir isotherm with the maximum adsorption capacity (Qm) of 3.9494 mg/g and 4.6685 mg/g for Co-MOF and Fe-MOF respectively.

Breathable Iron-based MIL–88 Framework as Dyes Adsorbent in Aqueous Solution

“…Therefore, it is proposed that MB adsorption is confined on a monolayer and the adsorption sites are homogeneous. The adsorption of MB on the surface of Fe-MOF (succinic acid ligand) has also been studied in the past to fit the Langmuir model [26]. Whereas the Freundlich model concurs with the experimental findings on RhB adsorption.…”

“…Furthermore, it is suggested that the bond between both cationic dyes and the external area of MOF-88B(Fe) is not entirely a monolayer adsorption. A small number of heterogeneous adsorptions may also exist, and the driving force may come from chemical adsorption [26].…”

“…Reusability is an important factor for an effective adsorbent in large-scale applications. The mixture of solvent elution was adopted from previous research [26]. MIL-88(Fe) was regenerated by a simple process for 30 mins until the solution became completely clear.…”

“…On the basis of our earlier findings, several transition metalbased MOFs have been described. For instance, high thermal stability Co-MOF and high surface area Y-MOF crystalline both demonstrated excellent performance as adsorbents for rhodamine B and methylene blue, respectively [25,26]. Transition metals have been reported to enhance the physicochemical properties of the as-synthesized MOF.…”

Layer-by-Layer Immobilization of DNA Aptamers on Ag-Incorporated Co-Succinate Metal–Organic Framework for Hg(II) Detection

“…With some adjustments made in accordance with previous literature [ 27 ], the solvothermal method was utilized to synthesize Co-succinate [ 27 ]. In a combination of 50 mL N,N-dimethylformamide (DMF) and 2.5 mL DI solvents, approximately 1.5 mmol of the 1.71 g succinic acid ligand was dissolved.…”