Metal organic frameworks decorated with free carboxylic acid groups: topology, metal capture and dye adsorption properties

Ahamad, M. Naqi; Khan, M. Shahnawaz; Shahid, M.; Ahmad, Musheer

doi:10.1039/d0dt02949a

Cited by 83 publications

(37 citation statements)

References 65 publications

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“…At present, the treatment methods of dye wastewater mainly contain coagulation, electrolysis, oxidation, photocatalytic degradation and adsorption, etc., [36–39] and adsorption has become the preferred treatment method for researchers due to simple operation [40] . Furthermore, uranyl functional complexes also have adsorption properties to dyes, which has been reported in previous literatures [41] . For example, Prof. Fu's group prepared polyamine‐based cyclophosphazene hybrid (PCP‐NH 2 ) hollow microcapsules to absorb dyes [42] .…”

Section: Introductionsupporting

confidence: 62%

“…[40] Furthermore, uranyl functional complexes also have adsorption properties to dyes, which has been reported in previous literatures. [41] For example, Prof. Fu's group prepared polyamine-based cyclophosphazene hybrid (PCP-NH 2 ) hollow microcapsules to absorb dyes. [42] In order to further broaden the application fields of uranyl complexes, in this work, it is found that four novel uranyl functional complexes have potential adsorption properties to Methylene Blue, Rose Red, Eosin and Coomassie Brilliant Blue.…”

Section: Introductionmentioning

confidence: 99%

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Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

et al. 2021

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The trans-dioxido uranyl frameworks named as [(UO 2 )(Aip)(DMA)] (1), H[(UO 2 )(Aib) 3 ] (2) and rare cis-dioxido [(UO 2 )Co(Suc) 2 (H 2 O) 4 ] (3), and [(UO 2 )Ni(Suc) 2 (H 2 O) 4 ] (4) have been synthesized, which based on 5-aminoisophthalic acid (H 2 Aip), 3-aminobenzoic acid (HAib), and succinic acid (H 2 Suc) as ligands. They were characterized by Fourier Transform Infrared spectra, UV-vis absorption spectra, single-crystal X-ray diffraction, powder X-ray diffraction and thermogravimetry analysis. It was found that uranium ion of the complex 1 is in the pentagonal bipyramidal coordination environment, while those of the complexes 2-4 are in the hexagonal bipyramidal coordination environment. Complexes 1, 3, and 4 are 3D network structures, 2 is a discrete structure. In particular, geometry of O=U=O for 1 and 2 are trans, ones for 3 and 4 are cis. The highest removal rate of methylene blue was almost to 96 % by complex 1 as an adsorbent, which illustrates that potential application on dye adsorption.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

et al. 2021

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“…As shown in Figure 4a, due to the differences in channels and functional groups, UPC‐60‐Cl and UPC‐60‐NH 2 show specific dye adsorption effects. Among them, UPC‐60‐Cl has an excellent adsorption effect on CV, RHB, and MO, with the maximum adsorption capacity reaching 147.2, 100.3, and 220.9 mg g −1 , respectively, which is comparable to the Fe@Cu‐MOF‐2COOH (MO: 225.1 mg g −1 ) [48] and higher than Cd‐based MOF (MO: 166.7 mg g −1 ), [49] but lower than PCN‐222 (MO: 589 mg g −1 ) [50] . This adsorption performance may be due to the multiple channel structures and environments having different adsorption effects on the dye molecules of different sizes.…”

Section: Resultsmentioning

confidence: 92%

Optimizing Fe‐Based Metal‐Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C₂H₂/CO₂ Separation

Zhang

Fan

Jiang

et al. 2021

Chemistry A European J

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Regulating the structure of metal-organic frameworks (MOFs) by adjusting the ligands reasonably is expected to enhance the interaction of MOFs on special molecules/ ions, which has significant application value for the selective adsorption of guest molecules. Herein, two tricarboxylic ligands H 3 LÀ Cl and H 3 LÀ NH 2 were designed and synthesized based on the ligand H 3 TTCA by replacing part of the benzene rings with C=C bonds and modifying the chlorine and amino groups on the 4-position of the benzene ring. Two 3D Fe-MOFs (UPC-60-Cl and UPC-60-NH 2 ) with the new topology types were constructed. As the C=C bonds of the ligands have flexible torsion angles, UPC-60-Cl features three types of irregular 2D channels, while UPC-60-NH 2 has a cage with two types of windows on the surface. The synergistic effect of unique channels and modification of functional groups endows UPC-60-Cl and UPC-60-NH 2 with high adsorption capacity for organic dyes. Compound UPC-60-Cl shows high adsorption capacity for CV (147.2 mg g À 1 ), RHB (100.3 mg g À 1 ), and MO (220.9 mg g À 1 ), whereas UPC-60-NH 2 exhibits selective adsorption of MO (158.7 mg g À 1 ). Meanwhile, based on the diverse pore structure and modification of active sites, UPC-60-Cl and UPC-60-NH 2 show the selective separation of equimolar C 2 H 2 /CO 2 . Therefore, reasonable regulation of organic ligands plays a significant role in guiding the structure diversification and performance improvement of MOFs.

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“…The metal ions were penta-coordinated and adopted a square pyramidal geometry (τ = 0.05) with O7 from the oximic group occupying the apical position [78]. The framework in 3 forms a 3-c uninodal net [79][80][81] of hcb topology (Figure 4, left) with the layers being parallel to the (1,0,1) plane [82][83][84]. Taking also into account the intermolecular interactions between the Hbtc 2-ligands, the resulted 3D framework exhibited a utp topological type (Figure 4, right) [85][86][87].…”

Section: Synthetic Discussionmentioning

confidence: 99%

ZnII and CuII-Based Coordination Polymers and Metal Organic Frameworks by the of Use of 2-Pyridyl Oximes and 1,3,5-Benzenetricarboxylic Acid

et al. 2021

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The simultaneous use of 2-pyridyl oximes (pyridine-2 amidoxime, H2pyaox; 2-methyl pyridyl ketoxime, Hmpko) and 1,3,5-benzenetricarboxylic acid (H3btc) provided access to five new compounds, namely [Zn(H2btc)2(H2pyaox)2]•2H2O (1•2H2O), [Zn(Hbtc)(H2pyaox)2]n (2), [Cu(Hbtc)(H2pyaox)]n (3), [Cu(Hbtc)(HmpKo)]n (4) and [Cu2(Hbtc)2(Hmpko)2(H2O)2]•4H2O (5•4H2O). Among them, 3 is the first example of a metal-organic framework (MOF) containing H2pyaox. Its framework can be described as a 3-c uninodal net of hcb topology with the layers being parallel to the (1,0,1) plane. Furthermore, 3 is the third reported MOF based on a 2-pyridyl oxime in general. 2 and 4 are new members of a small family of coordination polymers containing an oximic ligand. 1–5 form 3D networks through strong intermolecular interactions. Dc magnetic susceptibility studies were carried out in a crystalline sample of 3 and revealed the presence of weak exchange interactions between the metal centres; the experimental data were fitted to a theoretical model with the fitting parameters being J = −0.16(1) cm−1 and g = 2.085(1). The isotropic g value was also confirmed by electronic paramagnetic resonance (EPR) spectroscopy. Reactivity studies were performed for 3 in the presence of metal ions; the reaction progress was studied and discussed for Fe(NO3)3 by the use of several characterization techniques, including single crystal X-ray crystallography and IR spectroscopy.

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Metal organic frameworks decorated with free carboxylic acid groups: topology, metal capture and dye adsorption properties

Abstract: In this report, metal organic frameworks (MOFs) are designed and tuned for the structural variations in order to induce the metal capture which in turn directs the dye adsorption properties....

Cited by 83 publications

References 65 publications

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

Optimizing Fe‐Based Metal‐Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C₂H₂/CO₂ Separation

ZnII and CuII-Based Coordination Polymers and Metal Organic Frameworks by the of Use of 2-Pyridyl Oximes and 1,3,5-Benzenetricarboxylic Acid

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Metal organic frameworks decorated with free carboxylic acid groups: topology, metal capture and dye adsorption properties

Abstract: In this report, metal organic frameworks (MOFs) are designed and tuned for the structural variations in order to induce the metal capture which in turn directs the dye adsorption properties....

Cited by 83 publications

References 65 publications

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

Rare cis‐Dioxido Uranyl Framework Crystalline Complexes: Synthesis, Structure, Characterization and Properties

Optimizing Fe‐Based Metal‐Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C2H2/CO2 Separation

ZnII and CuII-Based Coordination Polymers and Metal Organic Frameworks by the of Use of 2-Pyridyl Oximes and 1,3,5-Benzenetricarboxylic Acid

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Optimizing Fe‐Based Metal‐Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C₂H₂/CO₂ Separation