Excited-state properties of lamellar solids derived from metal complexes and hydrogen uranyl phosphate

Microbially enhanced chemisorption of nickel into biologically synthesized hydrogen uranyl phosphate: A novel system for the removal and recovery of metals from aqueous solutions

“…As revealed by 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) (Macaskie et al, 1992), X-ray diffraction analysis (XRD) and proton-induced X-ray emission analysis (PIXE) (Yong and Macaskie, 1995a), microbially created HUP (polycrystalline HUO 2 PO 4 ⅐ 4H 2 O) is indistinguishable from HUO 2 PO 4 ⅐ 4H 2 O prepared chemically (Macaskie et al, 1992). A characteristic feature of HUP is its highly regular layered structure, in which sheets of uranyl phosphate anions are separated by water molecules creating a regular network of hydrogen bonds (Clearfield, 1988;Hunsberger and Ellis, 1990). The overall outcome of this highly organized crystal lattice is a high mobility of protons in the interlamellar space (Pham-Thi and Colomban, 1985), which gives rise to an intercalative ion-exchange property of HUP.…”

“…The overall outcome of this highly organized crystal lattice is a high mobility of protons in the interlamellar space (Pham-Thi and Colomban, 1985), which gives rise to an intercalative ion-exchange property of HUP. This can be described by: (Hunsberger and Ellis, 1990). The ability of chemically prepared HUP to intercalate Ni 2+ -cation and to remove Ni from the surrounding aqueous environment was experimentally proven (Pozas-Tormo et al, 1986, 1988.…”

Alkali-Ion-Catalyzed Transformation of Two Linear Uranyl Phosphonates into a Tubular One

“…Uranyl ion UO 2 2+ is widely known for its photochemical and photocatalytic redox behavior − and for its interesting luminescence properties , and rich spectroscopy. − However, seldom is this linear ion thought to be capable of forming extended lattices of a variety of covalently bound structure types , and, least of all, of undergoing transformations of these structures at room-temperature. Several recent investigations into how the uranyl ion interacts with alkyl- and arylphosphonic anions has led to the synthesis of a variety of structure types, linear-chain, layered, and tubular. − This is somewhat surprising given the fact that the uranyl ion can bind ligands only in its equatorial plane.…”

Time-resolved luminescence studies in hydrogen uranyl phosphate intercalated with amines

“…Studies of this compound has been centered on the structure [8][9][10][11], reactivity [12][13][14][15], vibrational spectroscopy [16], synthesis and characterization of intercalation compounds with different cationic species [17][18][19], diffusion and protonic conductivity mechanism [20][21][22][23][24][25][26][27][28], and chemisorption properties of HUP bound to biomass of bacteria [29][30][31][32][33]. Photoluminescence properties [34][35][36][37][38][39], have also been investigated in the literature, but they are not analyzed in terms of restricted geometry [40][41][42][43][44][45][46][47][48][49][50][51][52]. In this paper we report the characterization of four HUP intercalation compounds with aminium cations by timeresolved luminescence spectroscopy, and the results are analyzed by taking into account a model of reaction...…”