Hierarchical MOF-xerogel monolith composites from embedding MIL-100(Fe,Cr) and MIL-101(Cr) in resorcinol-formaldehyde xerogels for water adsorption applications

Wickenheisser, Martin; Herbst, Annika; Tannert, René; Milow, Barbara; Janiak, Christoph

doi:10.1016/j.micromeso.2015.05.017

Cited by 96 publications

(59 citation statements)

References 87 publications

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“…mean pore size 10 nm according to mercury porosimetry) in the OX-10 sample causes its water capacity to increase dramatically in the 0.9 < p/ p 0 < 1 interval, whilst sample OX-2100 displays the lowest total water adsorption capacity of the series studied due to the fact that its pores are too wide to play an important role in the adsorption of water. The water vapour adsorption isotherm obtained for this sample (OX-2100) is corroborated by others in the literature [43] corresponding to RF-xerogels with similar porosity that is not adequate for water adsorption applications. Therefore, although all RF-xerogels present hydrophilic character, not all of them can be used as desiccants but only the ones with the proper porosity.…”

Section: Desiccant Behavioursupporting

confidence: 82%

Desiccant capability of organic xerogels: Surface chemistry vs porous texture

Alonso-Buenaposada

Calvo

Montes-Morán

et al. 2016

Microporous and Mesoporous Materials

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a b s t r a c tResorcinol-Formaldehyde xerogels are organic polymers that can be easily tailored to have specific properties. These materials are composed of carbon, hydrogen and oxygen, and have a surface that is very rich in oxygen functionalities, and is therefore very hydrophilic. Their most interesting feature is that they may have the same chemical composition but a different porous texture. Consequently, the influence of porous characteristics, such as pore volume, surface area or pore size can be easily assessed. In this work, a commonly used desiccant, silica gel, is compared with organic xerogels to determine their rate and capacity of water adsorption, and to evaluate the role of surface chemistry versus porous texture. It was found that organic xerogels showed a higher rate of moisture adsorption than silica gel. Pore structure also seems to play an important role in water adsorption capacity. The OX-10 sample, whose porosity was mainly composed of micro-mesoporosity displayed a water adsorption capacity two times greater than that of the silica gel, and three times higher than that of the totally macroporous xerogel OX-2100. The presence of feeder pores (mesopores) that facilitate the access to the hydrophilic surface was observed to be the key factor for a good desiccant behaviour. Neither the total pore volume nor the high surface area (i.e. high microporosity) of the desiccant sample, is as important as the mesopore structure.

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Section: Desiccant Behavioursupporting

confidence: 82%

Desiccant capability of organic xerogels: Surface chemistry vs porous texture

Alonso-Buenaposada

Calvo

Montes-Morán

et al. 2016

Microporous and Mesoporous Materials

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“…Under vigorous stirring, HKUST‐1 irreversibly adsorbs at the interface of the CO 2 –water system, forming a thermodynamic stable C/W emulsion . Some studies revealed that MOF/HIPE polymer composites can be synthesized by other methods . The remarkable superiority of our work is its environmentally friendly procedure and simple post‐treatment.…”

Section: Introductionmentioning

confidence: 93%

High‐Performance Composite Monolith Synthesized via HKUST‐1 Stabilized HIPEs and Its Adsorptive Properties

Yang

Cao

et al. 2018

Macro Materials & Eng

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This paper presents a green and facile method for generating a composite monolith. HKUST‐1 (Pickering emulsifier) and PVA (co‐emulsifier), are used to stabilize supercritical carbon dioxide in water as high internal phase emulsion template to prepare interconnected hydrophilic porous monoliths. The effects of HKUST‐1 contents and CO2 densities on the performance of MOF/ polyacrylamide (PAM) polyHIPEs are investigated. The as‐synthesized MOF/PAM composites are characterized by FT‐IR, SEM, XRD, and TGA. The SEM patterns show that the composites are interconnected, the void sizes are 10–80 µm, and the interconnected pore throats are approximately 0.5–25 µm. The rheological and DMA measurement results indicate that the viscoelasticity and mechanical properties of the composites greatly improve after HKUST‐1 is embedded. Furthermore, the adsorptive properties of MOF/PAM to bovine serum albumin (BSA) are studied, and the adsorption capacity of MOF/PAM enhances with the increase in HKUST‐1 content. The adsorption capacity of the composite with 7 wt% HKUST‐1 reached 350.4 mg g−1 in 1.0 g L−1 BSA solution.

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“…The band located at 1474 cm -1 corresponds to CH 2 deformation vibrations and the one at 1613 cm -1 to the aromatic ring stretching vibration (C=C). Stretching vibration bands at 1217 and 1092 cm -1 indicate the presence of methylene ether bridges C-O-C), although they should be not dominant as they were not detected by NMR [23,24]. It should also be noted that, as in the case of NMR, FTIR revealed identical bands in both organic samples, indicating similar chemical compositions.…”

Section: Resultsmentioning

confidence: 99%

An underrated variable essential for tailoring the structure of xerogel: the methanol content of commercial formaldehyde solutions

Alonso-Buenaposada

Garrido

Montes-Morán

et al. 2017

J Sol-Gel Sci Technol

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Resorcinol-formaldehyde xerogels are polymers whose porosity can be designed for a specific application by the selection of appropriate physical and chemical synthesis variables. Until recently, the methanol content of commercial formaldehyde solutions has never been considered as a chemical variable that must also be taken into account. However, it has been demonstrated that the proportion of methanol might be even more important than other variables for tailoring the porosity of xerogels.Different reaction mechanisms are proposed to explain this heavy dependence of the final structure of RF xerogels. Organic and carbon xerogels synthesized with low concentrations of methanol showed a higher porosity with much larger pore sizes (up to two orders of magnitude) than when using formaldehyde with high concentrations of methanol. This means that extra caution needs to be shown in choosing these commercial products since formaldehyde solutions differ greatly in methanol content from one supplier to another.

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Hierarchical MOF-xerogel monolith composites from embedding MIL-100(Fe,Cr) and MIL-101(Cr) in resorcinol-formaldehyde xerogels for water adsorption applications

Cited by 96 publications

References 87 publications

Desiccant capability of organic xerogels: Surface chemistry vs porous texture

Desiccant capability of organic xerogels: Surface chemistry vs porous texture

High‐Performance Composite Monolith Synthesized via HKUST‐1 Stabilized HIPEs and Its Adsorptive Properties

An underrated variable essential for tailoring the structure of xerogel: the methanol content of commercial formaldehyde solutions

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