Highly porous and stable metal–organic frameworks for uranium extraction

Abstract

Three metal-organic frameworks (MOFs) of the UiO-68 network topology were prepared using the amino-TPDC or TPDC bridging ligands containing orthogonal phosphorylurea groups (TPDC is p,p 0terphenyldicarboxylic acid), and investigated for sorption of uranium from water and artificial seawater.The stable and porous phosphorylurea-derived MOFs were shown to be highly efficient in sorbing uranyl ions, with saturation sorption capacities as high as 217 mg U g À1 which is equivalent to binding one uranyl ion for every two sorbent groups. Coordination modes between uranyl groups and simplified phosphorylurea motifs were investigated by DFT calculations, revealing a thermodynamically favorable monodentate binding of two phosphorylurea ligands to one uranyl ion. Convergent orientation of phosphorylurea groups at appropriate distances inside the MOF cavities is believed to facilitate their cooperative binding with uranyl ions. This work represents the first application of MOFs as novel sorbents to extract actinide elements from aqueous media.

Recovery of metals from simulant spent lithium-ion battery as organophosphonate coordination polymers in aqueous media

“…[22] These materials have shown promise for diverse applications including catalysis, [23] sensing, [24] separations, [25] biomedicine, [26] and gas adsorption [27] or even as light-harvesting materials. [28,29] Recently, we have proposed for the first time the synthesis of MOFs from a mixture of Ni/Co/Mn using BDC (1,4-benzenedicarboxylic acid) and BTC (1,3,5-benzenetricarboxylic acid) ligands in an organic solvent (DMF).…”

Synthesis of polyamidoxime-functionalized nanoparticles for uranium(VI) removal from neutral aqueous solutions

“…Langmuir Freundlich Activated carbon 4.2 9 10 -4 3.0 28.30 [47] Zirconyl-molybdopyrophosphate-tributyl phosphate 1.26 9 10 -3 6.0 196.08 [11] AmidoximatedPolyacrylonitrile-Encapsulated Macroporous Beads 4.2 9 10 -4 6.0 1.98 [34] phosphine oxide functionalized mesoporoussilicas RLW 6.0 105 [28] Porous MOFs 5.2 9 10 -4 2.5 217 [26] Chitosan/PVA hydrogel 5.05 9 10 -4 5.0 156 [48] AO/amine fibers 4.2 9 10 -6 6.0 1.79 [5] Layered Metal Sulfides 1.68 9 10 -3 3.5 382 [20] poly(acrylic acid)-functionalized microspheres 2.5 9 10 -3 4.5 990 [32] Natural clinoptilolite-rich zeolite 4.2 9 10 -7 2.0 2.67 [49] Calcined and acid-activated kaolin 3.36 9 10 -4 5.0 4.52 [50] Lewatit TP260 3.0 9 10 -3 4.1 63.37 [51] Tulsion CH-96 2. finally the nanoparticles were used to adsorb uranium(VI) again. This process was repeated five times.…”

“…At present, solid-liquid separation is recognized as the widest application prospect because it can work more efficiently and it is environment-friendly. In the past decades, a lot of new adsorbents have been synthesized for solid-liquid separation of uranium(VI), such as hydrogels [22], membranes [23], modified fibers [24,25], metal-organic frameworks (MOFs) [26], magnetic materials [27] and mesoporous silicas [28], etc.…”

Three novel triazine-based materials with different O/S/N set of donor atoms: One-step preparation and comparison of their capability in selective separation of uranium

“…Among these, adsorption has played an increasingly important role in the field of conventional separation and analysis due to its high enrichment factors, absence of emulsion formation, flexibility, low consumption of reagents (especially organic solvent), large volume-reducing ratio and so on [11][12][13][14][15][16]. Commonly used adsorbents for separation of uranyl ions from aqueous solutions can be divided into the following groups: (I) carbonaceous adsorbents [17,18,50], (II) other inorganic adsorbents [19][20][21][22][23][24], (III) biosorbents [25][26][27][28], and (IV) others [29][30][31][32][33][34].…”