Porphyrin–Alkaline Earth MOFs with the Highest Adsorption Capacity for Methylene Blue

Abstract

A series of four porphyrin-alkaline earth metal- organic frameworks [Mg(HDCPP)2 (DMF)2 ]n ⋅(H2 O)7 n (1), [Ca(HDCPP)2 (H2 O)2 ]n (DMF)1.5 n (2), [Sr(DCPP)(H2 O)(DMA)]n (3), and [Ba(DCPP)(H2 O)(DMA)]n (4) was isolated for the first time from solvothermal reaction between metal-free 5,15-di(4- carboxyphenyl)porphyrin (H2 DCPP) and alkaline earth ions. Single-crystal X-ray diffraction analysis reveals the 2D and 3D supramolecular network with periodic nanosized porosity for 1/2 and 3/4, respectively. The whole series of MOFs, in particular, compounds 1 and 2 with intrinsic low molecular formula weight, exhibit superior adsorption performance for methylene blue (MB) with excellent capture capacity as represented by the thus far highest adsorption amount of 952 mg g(-1) for 2 and good selectivity, opening a new way for the potential application of the main group metal-based MOFs.

Enhanced adsorptive removal of anionic and cationic dyes from single or mixed dye solutions using MOF PCN-222

“…For instance, the size-controlled MIL-100(Fe) and complex 2, a porphyrin-containing MOF, strongly adsorb MB rather than MO. 22,27 Conversely, 1Y, a Mn II phosphonate MOF, has strong affinity to MO, but it can hardly remove MB from the…”

“…26 The PCN-222 tested in this work contains free base porphyrins only. Motivated by the fact that a porphyrin-containing MOF, called compound 2, exhibits good adsorption capacity for methylene blue (MB), 27 we tested the dye adsorption/removal ability of PCN-222 in this study.…”

“…Generally, MOFs are selective toward either cationic or anionic dyes. [27][28][29][30][31][32] However, removing cationic and anionic dyes simultaneously is a challenge 33 and mutual enhancement of individual adsorption by MOFs in a mixture of dye solution has never been reported. MB (13.4 Â 5.0 Â 4.2Å) and MO (14.5 Â 4.3 Â 3.1Å) are selected in this study as representative watersoluble cationic and anionic dyes, respectively, which are major-aromatic pollutants from textile, printing, paper and other industries.…”

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

“…There are only a few mentions in the literature concerning the capacity of porphyrin-hybrid materials to adsorb dyes. Recent work focused on the obtaining of a porous organic polymer, generated from 5,10,15,20-tetra-(1,1 -biphenyl) porphyrin, capable to adsorb 17.9 mg MB/g [26], but their anterior results using alkaline metal organic frameworks containing Ca(II)-5,15-di(4-carboxyphenyl)-porphyrin have the best ever reported performance, with an adsorption capacity of 952 mg MB/g [27].…”

Structural Transformation Pathways of Alkaline Earth Family Coordination Polymers Containing 3,3′,5,5′‐Biphenyl Tetracarboxylic Acid

“…[20][21][22] On the other hand, their low density and toxicity,a nd high stability to water and air,a sw ell as relatively low cost, attract many researchers to explore their potentiala pplicationsa sf unctional materials. [21,[23][24][25] It is worth investigating the step-by-steps tructural transformationo ff inal crystal compounds containing alkaline earth metal ions to meet the need of their controllable synthesis.…”