The comparison of the results of FT-IR and Raman spectroscopy, and PXRD, and TGA-DSC analyses of RhB⊂BUT-8(Cr) reveals the presence of electrostatic and π–π interactions between the RhB + ions and negatively charged SO 3 − moieties within the MOF architecture, leading to RhB removal with an ultra-high adsorption capacity. The recycling test result shows that an efficiency of 94.5% is retained over seven recycles. This indicates that RhB uptake is a chemical process. Furthermore, the kinetic data for the RhB adsorption fit with the pseudo-second order model. Accordingly, the maximum adsorption capacity of 811.7 mg g −1 is well-fitted by the Langmuir isotherm model, which is much higher than those of previously reported MOF materials.
The removal of the RhB dye using BUT-8(Cr) was studied in terms of solution pH, material content, adsorption isotherms, and kinetics to identify the most favorable conditions. A metal–organic framework containing metal sites of chromium, termed BUT-8(Cr), was successfully fabricated via a solvothermal procedure, which is capable of excellent uptake of the Rhodamine B (RhB) dye from the solution.
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