The amalgamated impact of bimetals, amino groups, and cross-linked structures of MOF on MOF for the removal of cationic dyes

• Published in: Inorganic chemistry communications 2024-12, Vol.170, p.113246, Article 113246
• Main Authors: Patil, Sagar S., Behare, Karishma P., Sonawane, Gunvant H., Labhane, Prakash K.
• Format: Article
• Language: English
• Subjects: Bimetallic MOF on MOF; Efficient and recyclable adsorbent; Langmuir isotherm
• ISSN: 1387-7003
• DOI: 10.1016/j.inoche.2024.113246

[Display omitted] •A bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 was prepared by solvothermal method and investigated its ability to adsorb cationic dyes from water.•The excellent adsorption efficiency is due to electrostatic attraction, π–π interactions, and hydrogen bonding, and the crosslinked structure of MOF on MOF.•The adsorption data are better fitted by the pseudo-second-order kinetic model, and Langmuir isotherm model describes the isotherm data well.•The adsorption process on bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 was endothermic and spontaneous. To protect the environment, it is important to develop effective materials/methods for eliminating or decomposing pollutants. Metal-organic frameworks (MOFs) have attracted considerable interest due to their special properties, including their exceptional porosity and customizable architecture, which make them highly adaptable for many applications. In this study, bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 was prepared and characterized by, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric and BET analysis. The prepared bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 served as a potent adsorbent for the efficient removal of cationic dyes via electrostatic, hydrogen bonding, ionic bonding, and π–π stacking. The adsorption of RhB and MB dyes by bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 includes both isothermal and kinetic studies. The equilibrium adsorption data was found to conform to the Langmuir isotherm, whereas the kinetic adsorption process followed a pseudo-second-order model. The cross-linked structure of MOF on MOF enhances the stability of the adsorbent, and has the potential to efficiently adsorb and release organic dyes over multiple cycles. The aforementioned interactions as well as stability and reusability make the bimetallic (Ce/Zr) NH2-UiO-66@NH2-MIL-125 one of the most promising adsorbent for the removal of dyes from water.