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Copper MOG for efficient anionic dyes adsorption and tunable transformation into single crystal MOF
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DOI：10.1016/j.rechem.2026.103223.png)
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Abstract
En 中文
A thermo-reversible copper (II) metal-organic gel (MOG), formed with a hexapyridine triphenylene ligand (3py) in dimethyl sulfoxide (DMSO) (minimum gelation concentration: 0.6 w/v%), was synthesized and structurally characterized via SEM, TEM, NMR, BET, TGA, Tgel experiments and rheological studies. Conversion of MOG to MOF was demonstrated, where single crystal XRD showed that it was a 3-D metal-organic framework (MOF) with 1-D porous channels throughout the structure along c axis. The resulting xerogel efficiently adsorbed anionic dyes (Rose Bengal, Eosin Y, Methyl Orange), with maximum adsorption capacities of 734.2, 751.6, and 302.5 mg/g, respectively, following Langmuir isotherms and pseudo-first-order kinetics. Mechanistic studies, employing FTIR and zeta potential analyses, demonstrated that adsorption was primarily driven by weak intramolecular interaction such as it-it stacking, alongside electrostatic interaction and hydrogen bonding. The significant charge differential between the positively charged xerogel and anionic dyes underscored the dominance of electrostatic attraction. This study elucidates the synthesis and adsorption efficacy of a novel MOG, offering potential for wastewater remediation.
Keywords:
Metal-organic gel
MOFs
Dyes adsorption
Triphenylene ligand
Organic pollutants
Journal
IF:
4.2
Papers:
506
Citations:
6.1K