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Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
Ni(SO)6(CH3)16(NO3)2(SO)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of sixteen methane molecules, two nitric acid molecules, two sulfur monoxide molecules, and one Ni(SO)6 cluster. In the Ni(SO)6 cluster, Ni is bonded in an octahedral geometry to six O atoms. There are a spread of Ni–O bond distances ranging from 2.08–2.10 Å. There are three inequivalent S sites. In the first S site, S is bonded in a distorted single-bond geometry to one O atom. The S–O bond length is 1.53 Å. In the second S site, S is bonded in a distorted single-bond geometry to one O atom. The S–O bond length is 1.54 Å. In the third S site, S is bonded in a distorted single-bond geometry to one O atom. The S–O bond length is 1.53 Å. There are three inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Ni and one S atom. In the second O site, O is bonded in a bent 120 degrees geometry to one Ni and one S atom. In the third O site, O is bonded in a bent 120 degrees geometry to one Ni and one S atom.
Ni(H2O)6(C3N2H6)4(NO3)2(H2O)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two methenamine molecules, two nitric acid molecules, one nsvfpfuroxfzjs-uhfffaoysa-n molecule, and four water molecules.
Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
The treatment of radioactive iodine released from nuclear power plants and radiological waste disposal sites is of great concern due to its high mobility and toxicity. In particular, iodide (I-) and iodate (IO3-) are the major iodine species of concern under various pHs and groundwater conditions. Herein, CoAl and NiAl layered double hydroxides (LDHs) were synthesized by a hydrothermal method and investigated to identify the removal mechanisms and efficiencies of both I- and IO3-. Both CoAl and NiAl LDHs exhibited rapid iodine removal processes within 20 min, following the pseudo-second-order model via ion-exchange with parent NO3- anion in the LDHs. The CoAl LDH’s maximum sorption capacities for I- and IO3- were about 1.67 and 2.16 mmol g-1, respectively, whereas for the NiAl LDH, these were about 2.10 and 2.26 mmol g-1, and they followed the Langmuir isotherm model. Interestingly, both the CoAl and NiAl LDHs showed a preferential ion-exchange affinity for IO3- over I-, which was attributed to the structural similarity of the IO3- and NO3- as well as new formation of secondary Co(or Ni)(IO3)2·2H2O phases. In addition, a desorption study indicated that the selectivity order was SO42- = IO3- = OH- > HCO3- > Cl- > NO3- = I- and demonstrated the higher retention of the IO3- than I- anion. This study provides insights into promising iodine sorbents and the different removal mechanisms of I- and IO3- using CoAl and NiAl LDHs.
Th(NO3)6NiO6O2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four water molecules, two NiO6 clusters, and two Th(NO3)6 clusters. In each NiO6 cluster, Ni is bonded in an octahedral geometry to six O atoms. There are a spread of Ni–O bond distances ranging from 1.82–1.86 Å. There are three inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Ni atom. In the second O site, O is bonded in a single-bond geometry to one Ni atom. In the third O site, O is bonded in a single-bond geometry to one Ni atom. In each Th(NO3)6 cluster, Th is bonded in a cuboctahedral geometry to twelve O atoms. There are a spread of Th–O bond distances ranging from 2.54–2.65 Å. There are three inequivalent N sites. In the first N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.25–1.28 Å. In the second N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.22–1.30 Å. In the third N site, N is bonded in a trigonal planar geometry to three O atoms. There are a spread of N–O bond distances ranging from 1.26–1.28 Å. There are nine inequivalent O sites. In the first O site, O is bonded in a distorted single-bond geometry to one Th and one N atom. In the second O site, O is bonded in a single-bond geometry to one N atom. In the third O site, O is bonded in a single-bond geometry to one N atom. In the fourth O site, O is bonded in a distorted single-bond geometry to one Th and one N atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one Th and one N atom. In the sixth O site, O is bonded in a distorted single-bond geometry to one Th and one N atom. In the seventh O site, O is bonded in a single-bond geometry to one N atom. In the eighth O site, O is bonded in a distorted water-like geometry to one Th and one N atom. In the ninth O site, O is bonded in a distorted single-bond geometry to one Th and one N atom.
Pt(NH3)4NiH4(C2O5)2(H2O)2 crystallizes in the orthorhombic I222 space group. The structure is zero-dimensional and consists of four water molecules, two NiH4(C2O5)2 clusters, and two Pt(NH3)4 clusters. In each NiH4(C2O5)2 cluster, Ni2+ is bonded in an octahedral geometry to six O2- atoms. There are four shorter (2.07 Å) and two longer (2.08 Å) Ni–O bond lengths. C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Ni2+ and two equivalent H1+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Ni2+ and one C4+ atom. In each Pt(NH3)4 cluster, Pt2- is bonded in a square co-planar geometry to four equivalent N3- atoms. All Pt–N bond lengths are 2.06 Å. N3- is bonded in a distorted trigonal non-coplanar geometry to one Pt2- and three H1+ atoms. All N–H bond lengths are 1.03 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom.
Rb3Ni2(NO3)7 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Rb–O bond distances ranging from 3.04–3.33 Å. In the second Rb1+ site, Rb1+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Rb–O bond distances ranging from 2.91–3.34 Å. Ni2+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of Ni–O bond distances ranging from 2.07–2.22 Å. There are four inequivalent N5+ sites. In the first N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of N–O bond distances ranging from 1.24–1.29 Å. In the second N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.23 Å) and two longer (1.29 Å) N–O bond length. In the third N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.24 Å) and two longer (1.28 Å) N–O bond length. In the fourth N5+ site, N5+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.25 Å) and one longer (1.31 Å) N–O bond length. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to two equivalent Rb1+ and one N5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Rb1+, one Ni2+, and one N5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one N5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Rb1+, one Ni2+, and one N5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one N5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Ni2+, and one N5+ atom. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to one Ni2+ and one N5+ atom. In the eighth O2- site, O2- is bonded in a distorted L-shaped geometry to two Rb1+, one Ni2+, and one N5+ atom. In the ninth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Rb1+, one Ni2+, and one N5+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one N5+ atom. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one N5+ atom.