A Spiderweb‐Like Metal–Organic Framework Multifunctional Foam

Abstract

Processing metal–organic frameworks (MOFs) into hierarchical macroscopic materials can greatly extend their practical applications. However, current strategies suffer from severe aggregation of MOFs and limited tuning of the hierarchical porous network. Now, a strategy is presented that can simultaneously tune the MOF loading, composition, spatial distribution, and confinement within various bio‐originated macroscopic supports, as well as control the accessibility, robustness, and formability of the support itself. This method enables the good dispersion of individual MOF nanoparticles on a spiderweb‐like network within each macrovoid even at high loadings (up to 86 wt %), ensuring the foam pores are highly accessible for excellent adsorption and catalytic capacity. Additionally, this approach allows the direct pre‐incorporation of other functional components into the framework. This strategy provides precise control over the properties of both the hierarchical support and MOF.

Application of Advanced Emulsion Technology in the Food Industry: A Review and Critical Evaluation

“…As a result of the tight packing of the oil droplets, HIPEs typically have semi-solid textures, which is useful for some applications. HIPEs are commonly stabilized using high levels of molecular emulsifiers [39] or colloidal particles [40,41]. Due to increasing consumer concerns about having synthetic ingredients within their foods, there has been a movement towards the identification and utilization of natural emulsifiers to form and stabilize HIPEs.…”

Hierarchical porous metal–organic framework materials for efficient oil–water separation

“…There are several reports in the literature of various MOF-based oil adsorbents, which can be classied as gels, aerogels, foams, sponges and fabrics. 125,134,[138][139][140][141][142][143][144] However, compared to MOFbased absorbents, adsorbents are less explored for carrying out the segregation of oil/water mixtures. To achieve a high oil adsorption capacity, pristine MOF and hybrid MOF-based adsorbents have also been prepared by using various supporting materials.…”

“…Recently, a MOF-based foam was synthesized by freeze-drying a MOF-HIEP template, prepared by growing ZIF-8 on ultrasonically designed cross-linked microspheres of carbon nanobers (CNFs) and bovine serum albumin (BSA). 140 By pre-incorporation of a hydrophobic polystyrene polymer into the reaction mixture, a composite adsorbent PS@ZIF-8 foam was constructed for separating (1 : 9 vol/vol) water-in-oil emulsions. The PS@ZIF-8 foam displayed superoleophilicity, which enabled a high adsorption capacity of 2400-3900 wt% for the adsorption of various organic solvents, oils and water.…”

“…Tan et al have described a novel strategy for synthesizing multifunctional MOF-based foams having spiderweb-like networks. 140 The strategy involved the intermediate immobilization of MOFs on cellulose nanober (CNF) based microspheres to obtain a ZIF-8-HIPE template, which was then freezedried to generate a ZIF-8 foam. Since the HIPE and the microspheres could be designed independently, by introducing hydrophobic polystyrene (PS) into the synthetic process, superhydrophobic PS@ZIF-8 was obtained.…”

“…Reproduced with permission. 140 Copyright 2020, John Wiley & Sons, Ltd. (e) Illustrative representation of ZIF-9-III@PVDF membrane synthesis and its oil/water separation properties. (f) Adsorption capacity of pristine PVDF and ZIF-9-III@PVDF membranes for various types of oils.…”