Aluminium fumarate and CPO-27(Ni) MOFs: Characterization and thermodynamic analysis for adsorption heat pump applications

Numerical and experimental investigation of desiccant cooling system using metal organic framework materials

CPO-27(Ni), aluminium fumarate and MIL-101(Cr) MOF materials for adsorption water desalination

Extracting atmospheric moisture for freshwater production is an appealing way to mitigate the global water crisis. However, the low moisture sorption capacity and high desorption temperature are the major bottlenecks for efficient atmospheric water harvesting. Herein, we develop a transition metal super-hygroscopic hydrogel by an economical strategy, which is constructed through a facile coordination between metal salts and ethanolamine. When the empty electron orbital of the metal ion is coordinated with the lone electron pair of nitrogen or oxygen atom, the water active sorption site is formed. A single water layer is bonded on the sites by a coordination effect, followed by physical interaction with water to form multi-layer structures. The Fe and Co ions in the hydrogel function as dual sorption sites to capture moisture, which can harvest additional water by the synergistic effect of bimetals. As a result, the bimetal hydrogel contributes to a high water uptake of 5.22 g g-1 at 95% RH, triggering the desorption process by one solar intensity due to its low desorption temperature (≤50 °C).

Numerical and experimental investigation of multiple heat exchanger modules in cooling and desalination adsorption system using metal organic framework

Preparation of metal organic framework materials with defects via a mixed-metallic centers strategy for enhanced removal of organic dye

Metal-organic framework (MOF) materials have revolutionized the applications of nanoporous materials. They can be potentially used in separation, storage, and catalysis, among other applications. Since their discovery in 1999 (Li et al. Nature 402:276-279, 1999; Chui Science 283:1148-1150, 1999), more than 20,000 new structures have been synthesized thanks in part to their high compositional versatility. However, only some of them are really stable in water (both in liquid and vapor phase), which limits their employment in other applications. Furthermore, biocatalysis field has been demanding a "universal support" able to encapsulate/immobilize any type of enzyme in a straightforward methodology and, simultaneously, capable of keeping the enzymatic catalytic activity. This requisite set has been a big challenge considering the drastic synthesis conditions required for most of the MOF materials. Thus, a compromise between the development of a well-formed material support and an acceptable enzymatic activity had to be achieved in order to obtain active biocatalysts, ideally prepared in just one step and under sustainable conditions. In this chapter, we describe the protocols about how to synthesize MOF materials in water, under mild conditions and almost instantaneously in the presence of enzymes. The most successful support of these sustainable MOFs was the semicrystalline Fe-BTC MOF material (like the commercial Basolite F300) allowing the development of efficient active biocatalysts (97% with respect to the free enzyme in the case of CALB lipase). Particularly, this enzyme support improves the benefits given by some other MOF-based supports also described in this chapter, like NH2-MIL-53(Al). Furthermore, we present the post-synthesis immobilization approach, which consists firstly in the synthesis or preparation of the respective MOF material (Fe-BTC or NH2-MIL-53(Al)), followed by an enzyme immobilization protocol. As reported in bibliography, MOFs as enzyme supports combine together more active biocatalysts with lower enzyme leaching when compared to other conventional materials. Moreover, MOFs prepared in non-aqueous media (for instance, N,N-dimethylformamide) can also trap enzymes in an otherwise adverse media. These facts bring these biocatalysts closer to industrial employment in even more demanding applications.

Recent advances in small-angle scattering techniques for MOF colloidal materials

Synthesis of metal-organic framework-luminescent guest (MOF@LG) composites and their applications in environmental health sensing: A mini review

Perchlorate removal from aqueous solution with a novel cationic metal–organic frameworks based on amino sulfonic acid ligand linking with Cu-4,4′-bipyridyl chains

Facile synthesis and characterization of novel dicarboxylate-Cu based MOFs materials

Performance investigation of silica gel based consolidated composite adsorbents effective for adsorption desalination systems

NaN3, as a kind of rich-nitrogen energetic material, engaged in the synthesis of hierarchical transition metal (Co/Ni) organic framework materials (MOFs) through a facile hydrothermal reaction, during which aqueous N3 − function groups being as an unique ligand in preparation of novel coordination polymer with the existence of Co2+ (or Ni2+) salts and dicyandiamide. The obtained compounds (Co-eMOF, Ni-eMOF, NiCo-eMOF) were characterized by structure and composition analysis, specific surface area, thermogravimetric analysis (TGA) and crystal X-ray diffraction. The prepared products regardless of the metal cautions (Co, Ni, or coexist Co and Ni), perform a well three-dimensions (3D) nanostructures with spherical shaped monoliths, known as organic framework materials. The as-prepared products with developed porosity demonstrate a high surface area in range of 80∼130 m2/g. XRD patterns for these three examples show similar lattice crystalline, which to an extent matches well with the simulated MOF-74 materials, suggesting profound formation of oriented crystal growth. XPS reveals the compounds all equipped with high nitrogen content (54∼60 at%), which is largely hinging on the contribution from N3 − function groups, suggesting the superiority of NaN3 serving as the rich nitrogen precursor. Accounting for extensive application, we will apply this as-prepared (Co/Ni) MOF materials as one kind of nitrogen-rich precursor and conduct them for further calcination treatment for preparation of graphite-based transition metal carbides (TMC), and it is highly anticipated to achieve efficient activity towards electrocatalysis in our follow-up actions.

Metal-organic framework (MOF) materials and functionalization for targeted adsorption of pb and cd in wastewater: Mechanisms, challenges, and future development prospects.

PurposeThe purpose of this study was to prepare carboxylated attapulgite (APT-COOH) and then be used as one of the ligands to prepare metal organic framework (MOF) hybrid materials to reduce the cost of MOF materials and improve the dispersed condition of APT. And then the materials were used to enrich anionic dye Congo red from aqueous solution.Design/methodology/approachThe MOF hybrid materials were designed by means of facile reflux method rather than hydrothermal method, characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectrometer and pore structure. The dispersed degree of APT-COOH in the MOF materials was validated according to adsorption efficiency for Congo red.FindingsDue to introduction of APT-COOH, the microenvironment of the MOF materials changed, leading to different adsorption behaviors. Compared to the MOF material without APT-COOH, the adsorption capacities of the hybridized MOF materials with different amounts of APT-COOH introduced increased by 4.58% and 15.55%, respectively, as the initial concentration of Congo red solution of 300 mg/L. Meantime, hybridized MOF materials were suitable to remove Congo red with low concentration, while the MOF material without APT-COOH was appropriate to enrich Congo red with high concentration.Research limitations/implicationsThe microstructure of MOF hybrid materials in detail is the further and future investigation.Practical implicationsThis study will provide a method to reduce the cost of MOF materials and a theoretical support to treat anionic dyes from aqueous solution.Originality/valueAPT-COOH was prepared and used as one of the ligands to synthesize MOF material to improve the dispersed degree of APT-COOH and reduce the cost of the MOF materials. The adsorption efficiency was greatly enhanced with low concentration of Congo red solution, and the results indicated that hydrogen bonding, electrostatic interaction, and p-p conjugation were involved in the adsorption process. The prepared MOFs materials exhibited excellent adsorption efficiency, which made the present materials highly promising and potentially useful in practical application as adsorbents to enrich anionic dyes such as Congo red from aqueous solution.

Optimization of microwave absorption properties of flaky FeSiAl magnetic alloy by surface modification