Enhancing the remarkable adsorption of Pb²⁺ in a series of sulfonic-functionalized Zr-based MOFs: a combined theoretical and experimental study for elucidating the adsorption mechanism

Abstract

A combined theoretical and experimental study for interpreting the adsorption mechanism.

Engineering of appropriate pore size combined with sulfonic functionalization in a Zr-MOF with reo topology for the ultra-high removal of cationic malachite green dye from an aqueous medium

“…This shows that the sorption process of MG onto H + ⊂Reo-MOF-1 is most likely to be beneficial and irreversible, which could be attributed to the strong attraction of the active sites within H + ⊂Reo-MOF-1 with the positively charged species and π electron clouds of the aromatic rings of the MG dye. 21,22,41 Furthermore, the 1/ n parameter calculated from the Freundlich model reveals the favorable adsorption process of MG over H + ⊂Reo-MOF-1.…”

“…4-Sulfonaphthalene-2,6-dicarboxylic acid (H 3 SNDC) linker, and DUT-52 were prepared like the reported literature (Section S1†). 21,22…”

“…4-Sulfonaphthalene-2,6dicarboxylic acid (H 3 SNDC) linker, and DUT-52 were prepared like the reported literature (Section S1 †). 21,22 Powder X-ray diffraction (PXRD) analysis were measured on a Bruker D8 Advance diffractometer using Ni ltered Cu Ka (l = 1.54718 Å). Fourier transform infrared (FT-IR) spectra were carried out on a spectrophotometer (FT/IR-6600, Jasco) with the Attenuated Total Reectance sampling method.…”

“…18,19 MOFs are porous materials composed of metal clusters and organic linkers to generate a three-dimensional structure in such a way with diverse topologies. The architecture of MOFs allows the facile modication of the functional groups on the linkers, leading to a broad range of applications in adsorption, [20][21][22] sensing, 23,24 catalysis, 25,26 and among others.…”

“…Besides, we published a series of sulfonic-functionalized Zrbased MOFs with ultra-high adsorption levels of cationic methylene blue dye and Pb 2+ ions via the strong electrostatic attraction of their positively charged moieties with the negative charged SO 3 − sites inside Zr-MOF structure. 21,22 With all of this considered, we expect that Reo-MOF-1, owning a suitable pore size and dense SO 3 − moieties packed within the framework, will be employed to eliminate MG from aqueous solution and reach a high uptake of MG via efficient synergy.…”