Insights into chromatographic separation using core–shell metal–organic frameworks: Size exclusion and polarity effects

Qin, Weiwei; Silvestre, Martin E.; Kirschhöfer, Frank; Brenner‐Weiß, Gerald; Franzreb, Matthias

doi:10.1016/j.chroma.2015.07.120

Cited by 21 publications

(12 citation statements)

References 34 publications

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“…3E and F). Macromolecules, such as Congo red and HA, did not affect the adsorption of iAs because of the size exclusion effect of the crystalline MIL-100(Fe) with the 1-nm pores50. Thus, the MIL-100(Fe) shell also provided the possibility of improving selectivity by its electrostatic repulsion interactions and size exclusion effect.…”

Section: Resultsmentioning

confidence: 99%

CoFe2O4@MIL-100(Fe) hybrid magnetic nanoparticles exhibit fast and selective adsorption of arsenic with high adsorption capacity

Yang

Yin

2017

Sci Rep

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In this study, we report the synthesis and application of mesoporous CoFe2O4@MIL-100(Fe) hybrid magnetic nanoparticles (MNPs) for the simultaneous removal of inorganic arsenic (iAs). The hybrid adsorbent had a core-shell and mesoporous structure with an average diameter of 260 nm. The nanoscale size and mesoporous character impart a fast adsorption rate and high adsorption capacity for iAs. In total, 0.1 mg L−1 As(V) and As(III) could be adsorbed within 2 min, and the maximum adsorption capacities were 114.8 mg g−1 for As(V) and 143.6 mg g−1 for As(III), higher than most previously reported adsorbents. The anti-interference capacity for iAs adsorption was improved by the electrostatic repulsion and size exclusion effects of the MIL-100(Fe) shell, which also decreased the zero-charge point of the hybrid absorbent for a broad pH adsorption range. The adsorption mechanisms of iAs on the MNPs are proposed. An Fe-O-As structure was formed on CoFe2O4@MIL-100(Fe) through hydroxyl substitution with the deprotonated iAs species. Monolayer adsorption of As(V) was observed, while hydrogen bonding led to the multi-layer adsorption of neutral As(III) for its high adsorption capacity. The high efficiency and the excellent pH- and interference-tolerance capacities of CoFe2O4@MIL-100(Fe) allowed effective iAs removal from natural water samples, as validated with batch magnetic separation mode and a portable filtration strategy.

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Section: Resultsmentioning

confidence: 99%

CoFe2O4@MIL-100(Fe) hybrid magnetic nanoparticles exhibit fast and selective adsorption of arsenic with high adsorption capacity

Yang

Yin

2017

Sci Rep

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“…To date, numerous reports have been made to describe the adsorption capacity (and characteristics) of MOFs against common VOCs like aromatic hydrocarbons (e.g., benzene, toluene, and xylene)142021222324. There is yet a paucity of quantitative data on their capacity toward semi-volatile organic species such as C 2 –C 5 VFAs, phenolic, and indolic compounds.…”

mentioning

confidence: 99%

Metal organic frameworks as sorption media for volatile and semi-volatile organic compounds at ambient conditions

Vellingiri

Szulejko

Kumar

et al. 2016

Sci Rep

139

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In this research, we investigated the sorptive behavior of a mixture of 14 volatile and semi-volatile organic compounds (four aromatic hydrocarbons (benzene, toluene, p-xylene, and styrene), six C2-C5 volatile fatty acids (VFAs), two phenols, and two indoles) against three metal-organic frameworks (MOFs), i.e., MOF-5, Eu-MOF, and MOF-199 at 5 to 10 mPa VOC partial pressures (25 °C). The selected MOFs exhibited the strongest affinity for semi-volatile (polar) VOC molecules (skatole), whereas the weakest affinity toward was volatile (non-polar) VOC molecules (i.e., benzene). Our experimental results were also supported through simulation analysis in which polar molecules were bound most strongly to MOF-199, reflecting the presence of strong interactions of Cu2+ with polar VOCs. In addition, the performance of selected MOFs was compared to three well-known commercial sorbents (Tenax TA, Carbopack X, and Carboxen 1000) under the same conditions. The estimated equilibrium adsorption capacity (mg.g−1) for the all target VOCs was in the order of; MOF-199 (71.7) >Carboxen-1000 (68.4) >Eu-MOF (27.9) >Carbopack X (24.3) >MOF-5 (12.7) >Tenax TA (10.6). Hopefully, outcome of this study are expected to open a new corridor to expand the practical application of MOFs for the treatment diverse VOC mixtures.

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“…9C). chloroaniline isomers per HKUST-1 unit cell [34]. A possible explanation for the discrepancy may again originate from imperfections in the crystallinity of our UiO-67 MOF shells.…”

Section: Single Component Chromatography Runs With Isocratic Elutionmentioning

confidence: 87%

Insights into the separation performance of MOFs by high-performance liquid chromatography and in-depth modelling

Qin

Silvestre

Brenner‐Weiß

et al. 2015

Separation and Purification Technology

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Insights into chromatographic separation using core–shell metal–organic frameworks: Size exclusion and polarity effects

Cited by 21 publications

References 34 publications

CoFe2O4@MIL-100(Fe) hybrid magnetic nanoparticles exhibit fast and selective adsorption of arsenic with high adsorption capacity

CoFe2O4@MIL-100(Fe) hybrid magnetic nanoparticles exhibit fast and selective adsorption of arsenic with high adsorption capacity

Metal organic frameworks as sorption media for volatile and semi-volatile organic compounds at ambient conditions

Insights into the separation performance of MOFs by high-performance liquid chromatography and in-depth modelling

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