An Imide-Decorated Indium-Organic Framework for Efficient and Selective Capture of Carcinogenic Dyes with Diverse Adsorption Interactions

Abstract

A functional indium-organic framework with an anionic skeleton, [(CH 3 ) 2 NH 2 ][In(BDCPPI)]•0.5DMF•H 2 O (compound 1, H 4 BDCPPI = N,N′-bis(3,5-dicarboxyphenyl)pyromellitic diimide, DMF = N,N-dimethylformamide), has been solvothermally synthesized. Compound 1 with a (4, 4)-connected pts network is constructed by negative [In(OOC) 4 ] − secondary building units (SBUs) and expanded tetracarboxylate ligands with functional imide groups. Meanwhile, the overall framework possesses large open channels of 17.3 × 5.5 Å with a high solvent-accessible volume that occupied about 69.2% of the total cell volume.Due to its anionic skeleton and imide-functional channels, compound 1 can efficiently adsorb large-sized carcinogenic Basic Red 9 (BR9) and Basic Violet 14 (BV14) under the synergetic promotion of Coulombic interaction, hydrogen bonding, and ion exchange and can display a repelling effect to anionic dyes. In addition, the maximum adsorption capacities for BR9 and BV14 are as high as 245 and 227 mg g −1 , respectively. With regard to series of mixtures with oppositely charged dyes, compound 1 can selectively trap carcinogenic dyes. Therefore, compound 1 should be a promising metal−organic framework (MOF)-based material for the efficient and selective adsorption of carcinogenic dyes.

Highly ordered pure and indium-incorporated MCM-41 mesoporous adsorbents: synthesis, characterization and evaluation for dye removal

“…The release of such materials generates unpleasant colored water as the existence of less than 1 ppm of these dyes in water is highly perceptible. Further, discharge of these dyes carries serious threats to living organisms as several dyes and their degradation products are toxic and could be even carcinogenic [4,5]. Therefore, a growing global concern to treat and remove such hazardous has been conducted.…”

Rapid adsorption and selective capture of methylene blue by anionic In‐based MOF with carboxyl‐decorated pore surface

“…[12][13][14][15][16][17] Based on previous research theories, ionic MOF materials can adsorb dyes with opposite charges to the pores/channels but dyes that possess same charges will be rejected through ion-exchange and electrostatic interactions. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Liu et al [26] reported an anionic framework material with functional imide groups can efficiently adsorb Basic Red 9 and Basic Violet 14 by electrostatic interaction and ion-exchange. In addition, the adjustable nature of pore structure can allow the window size/shape of MOF materials to match the target dye molecules depend on sizeexclusive effects.…”

“…MOF materials exhibit unique advantages in the high adsorption capacity, effective selectivity and rapid adsorption rate of organic pollutants owing to high specific surface area, adjustable pore structure (size, shape and modified functional groups) and designable skeleton structure [12–17] . Based on previous research theories, ionic MOF materials can adsorb dyes with opposite charges to the pores/channels but dyes that possess same charges will be rejected through ion‐exchange and electrostatic interactions [18–36] . Liu et al [26] reported an anionic framework material with functional imide groups can efficiently adsorb Basic Red 9 and Basic Violet 14 by electrostatic interaction and ion‐exchange.…”

Efficient Gas and VOC Separation and Pesticide Detection in a Highly Stable Interpenetrated Indium–Organic Framework

“…Interpenetration is a well-known structural feature of MOFs, which not only enhances structure stability but also, in comparison to noninterpenetrating frameworks, provides an optimal pore size, thereby improving the adsorption selectivity of the material by restricting the size of the guest molecules entering the pores. − Meanwhile, the selection of metal ions and the design of organic ligands as two key roles take part in the construction of stable adsorption and separation materials. According to the hard/soft acid–base principle, the structures constructed by high-oxidation-state metal ions, such as an In 3+ ion, with carboxylic acid ligands tend to give stable MOFs. − The introduction of polar functional groups such as amide groups in the ligand can enhance the interaction of the framework with certain guest molecules and further improve the adsorption and separation effects. − …”