Adsorption Desulfurization via π-Complexation with Ag⁺-Exchanged Anionic Metal–Organic Framework

Abstract

The anionic metal–organic framework (Cu-BTC-DMA) was synthesized by the hydrothermal method. The extra-framework (CH3)2 NH2 + cations in Cu-BTC-DMA structure are movable and can be easily exchanged with Ag+. The Ag+-exchanged Cu-BTC-DMA was characterized through FT-IR, XRD, SEM, ICP, and N2 adsorption–desorption isotherms. The adsorption properties of Ag+-exchanged Cu-BTC-DMA with different Ag cation content were studied for the model fuel with different concentrations of thiophene. The results show that the Ag+-exchanged adsorbents show higher adsorption capacity for thiophene, which was ascribed to the introduction of Ag+ into Cu-BTC-DMA. Thiophene can interact with Ag+ via π-complexation. In addition, the Ag@Cu-BTC-DMA still shows the good performance of adsorption desulfurization in the presence of toluene. Ag@Cu-BTC-DMA (0.02 M) shows the highest adsorption capacity among the three adsorbents due to the high Ag+ amount and the almost integrated crystalline structure. In the process of regeneration, approximately 86% of the adsorptive capacity of Ag@Cu-BTC-DMA (0.02 M) can be recovered after four cycles.

Synthesis of nanocellulose aerogels and Cu-BTC/nanocellulose aerogel composites for adsorption of organic dyes and heavy metal ions

“…Metal–organic frameworks (MOFs) are porous crystalline polymer networks of metal nodes (metal ions or clusters) connected to multidentate organic linkers, which are themselves linked by strong covalent bonds forming one-, two-, or three-dimensional networks 1 – 3 . MOFs are also known as porous coordination polymers (PCPs) or porous coordination networks (PCNs) 4 – 6 .…”

Application of Metal‐Organic Frameworks in Adsorptive Removal of Organic Contaminants from Water, Fuel and Air

“…However, such reduction was not observed in similar MOFs like MIL‐53(Al) or MIL‐53(Cr) because of inappropriate redox potential [96] . Similar to the Cu(I)/MOFs, several works showed efficient desulfurization with MOFs loaded with Ag(I) [97,98] …”

Synthesis of Nanocellulose Aerogels and Cu-BTC/Nanocellulose Aerogel Composites for Adsorption of Organic Dyes and Heavy Metal Ions

“…Metal-organic frameworks (MOFs) are porous crystalline polymer networks of metal nodes (metal ions or clusters) connected to multidentate organic linkers, which are themselves linked by strong covalent bonds forming one-, two-, or three-dimensional networks [1] [2] [3]. MOFs are also known as porous coordination polymers (PCPs) or porous coordination networks (PCNs) [4], [5], [6].…”