Synthesis and Characterization Bimetallic Organic Framework CoxFex(BDC) and Adsorption Cationic and Anionic Dyes

Abstract

Co-doped Fe-MOF bimetallic organic framework materials at different ratios were synthesized based on the solvothermal method, and we evaluated their morphological characteristics by modern analytical methods such as SEM, XRD, FT-IR, and isotherm of nitrogen adsorption-desorption (BET). The specific surface area of the 0.3 CoFe-MOF sample (280.9 m2/g) is much larger than the Fe-MOF and samples at other ratios. The post-synthesized materials were evaluated for their ability to absorb various dyes, including Methylene Blue (MB), Methyl orange (MO), Congo red (CR), and Rhodamine (RhB), and evaluated for the effects of pH, the initial concentration of the dye solution, time, and dose of adsorbent. The results show that the 0.3 CoFe-MOF material has a high adsorption capacity that is superior to both the original Fe-MOF and the CoFe-MOFs at other ratios. The highest adsorption capacity of MB dye by 0.3 CoFe-MOF reaches up to 562.1 mg/g at pH 10, the initial concentration of MB of 200 mg/L, after 90 min. The charged properties of the dyes and the charged nature of the bimetallic organic frameworks are best demonstrated through the adsorption of dye mixtures. The adsorption efficiency on the mixed system of cationic (MB) and anionic (MO) dyes yielded the highest removal efficiency of 70% and 81%, respectively, after 30 min. Therefore, the research has opened up the potential application of M/Fe-MOF modified materials and CoFe-MOF in organic dyes adsorption in wastewater treatment for environmental protection.

Adsorption and Removal of Industrial Dyes by Water-Stabilized Aluminum-Based Metal–Organic Frameworks

“…Comparing the relevant parameters of these two models, it is evident that the Langmuir isotherm model more accurately portrays the adsorption behavior of CR on CAU-23 at 15, 25, and 35 °C, suggesting that the adsorption process is mainly single-molecule layer adsorption. The n values are all within the range of 1 < n < 10, indicating that the process is beneficial for adsorption. , …”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…The obtained values of the correlation coefficient (R 2 ) (≈0.98) suggesting that the adsorption isotherm data of the adsorption of MB species onto P@SiO 2 nanocomposite fits better for both Langmuir and Freundlich isotherm models. Based on the closest values of the experimental and calculated Q max , the adsorption results of MB species onto P@SiO 2 nanocomposite were fitted well with the Langmuir model representing monolayer adsorption on homogeneous surfaces [ 17 , 26 ]. Hence, the MB species sequestration processes occurred at P@SiO 2 nanocomposite surfaces via the monolayer adsorption systems [ 26 , 47 ].…”

“…Adsorption, among the techniques, is the most powerful, economical, and efficient technique utilized to decontaminate dyes from wastewater at low concentrations due to its simplicity, low cost, and not requiring advanced technology [ 10 , 11 , 12 , 13 ]. During this year, novel adsorbent materials have been reported to remove toxic dyes such as methylene blue from wastewater [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Activated carbon (AC) is one of the most traditional, effective, and extensively utilized adsorbents in adsorption technologies, and it is among the cheapest sorbents in market.…”

Cobalt Iron-Metal Organic Framework Coordinated to CMC Aerogel by Solvothermal Method and Application to Tetracycline Antibiotics Adsorption

“…Co-doped Fe-MOFs materials were synthesized by using the solvent heat method as described previously by Tran et al [19]. Specifically, FeCl3.6H2O (2.1 g), Co(NO3)2.6H2O (0.68 g), and 1,4-benzene dicarboxylic acid (0.83) were dissolved in 60 mL of DMF, then stirred homogeneously (solution A) [19].…”

“…Co-doped Fe-MOFs materials were synthesized by using the solvent heat method as described previously by Tran et al [19]. Specifically, FeCl3.6H2O (2.1 g), Co(NO3)2.6H2O (0.68 g), and 1,4-benzene dicarboxylic acid (0.83) were dissolved in 60 mL of DMF, then stirred homogeneously (solution A) [19]. Besides, 2 g of CMC was mixed homogenously with 30 mL of deionized water until a clear solution was obtained, which was then transferred to a 96-well plate and incubated for 1 h for gel formation.…”