Hierarchical porous zeolitic imidazolate frameworks nanoparticles for efficient adsorption of rare-earth elements

Salts Induced Formation of Hierarchical Porous ZIF‐8 and Their Applications for CO2 Sorption and Hydrogen Generation via NaBH4 Hydrolysis

“…Zeolitic imidazolate frameworks (ZIFs), [ 1–11 ] a class of metal organic frameworks, [ 12,13 ] have been applied for several applications such as catalysis, biomedical, [ 14 ] and environmental‐related fields. ZIFs materials offer several advantages including large surface area, tunable pore size, active metal sites, and good thermal and chemical stability due to the strong coordination bonds between the metal centers and linker donating atoms such as ‐N‐.…”

Hierarchical Micro‐ and Mesoporous Zn‐Based Metal–Organic Frameworks Templated by Hydrogels: Their Use for Enzyme Immobilization and Catalysis of Knoevenagel Reaction

“…We also compared the thermal gravimetric analysis (TGA) curves of HZIF‐8 (0.05) and conventional ZIF‐8 and found that the thermal stability did not vary (Figure f). Compared with other templating methods that were used for the preparation of mesoporous MOFs, our new hydrogel templating strategy enabled the formation of MOF with larger mesopores with an average diameter ranging from 16.2 to 27.5 nm. This MOF also featured a larger BET surface area and mesopore volume (Table S1, Supporting Information).…”

“…The templating is another type of efficient approach producing mesopores within MOFs framework such as double‐solvent mediated overgrowth and etching of nanoparticles . To date, the reported templates include hexadecyl trimethyl ammonium bromide, amphipathic surfactants, block polymers, poly(diallyldimethylammonium chloride), and zinc hydroxide nitrate nanosheets . Recently, Shen et al pioneered the construction of MOF single crystals featuring highly oriented and ordered macropores using polystyrene nanosphere monolith as the template …”

“…[48] To date, the reported templates include hexadecyl trimethyl ammonium bromide, [49,50] amphipathic surfactants, [51] block polymers, [52] poly(diallyldimethylammonium chloride), [53] and zinc hydroxide nitrate nanosheets. [54] Recently, Shen et al pioneered the construction of MOF single crystals featuring highly oriented and ordered macropores using polystyrene nanosphere monolith as the template. [55] We are now reporting a new, simpler, green, and easily manageable templating strategy for the preparation of hierarchical micro-and mesoporous zeolite imidazole frameworks HZIF-8 and HZIF-67 using hydrogel as the template.…”

Adsorption and kinetic study of Cr(VI) on ZIF-8 based composites

“…microwave, steam assisted and sonochemical routes have also been reported [46]. ZIF-8 can also be synthesized in natural aqueous system, but these syntheses require extremely diluted environment with exceptionally high MeIM concentration with respect to Zn 2+ (1:70) [47][48][49][50][51][52][53][54][55]. From application point of view, our synthesis scheme was intended to use high metal concentration in order to get high product yield without using excessive amounts of expensive MeIM which was essential for green synthesis.…”