High-resolution synchrotron radiation x-ray powder diffraction (HR-XRPD) combined with Hf L3-edge extended x-ray absorption fine structure allowed us to determine the structure of a Hf-UiO-66 metal-organic framework (MOF) showing that it is isoreticular to Zr-UiO-66MOF [Cavka et al., J. Am. Chem. Soc. 130, 13850 (2008).]. Thermal gravimetric measurements (coupled with mass spectroscopy) and temperature-dependent synchrotron radiation XRPD proved the high thermal stability of the Hf-UiO-66 MOF. The Langmuir surface area (849 m2/g) combined with the high stability of the UiO-66 framework and with the high neutron absorption cross section of Hf suggest that among all microporous crystalline materials the Hf-UiO-66 MOF possesses the physical and chemical requirements for the interim storage of radioactive waste in a much safer way than is currently available. The first results proving the synthesis of a MOF material with UiO-66 topology realized by a B-containing linker are also reported, allowing a further improvement of the neutron shielding power of this class of materials.

Combined study of structural properties of metal-organic frameworks changing organic linkers and metal centers

GIANOLIO, DIEGO;VITILLO, Jenny Grazia;CIVALLERI, Bartolomeo;BORDIGA, Silvia;VALENZANO, LOREDANA;LAMBERTI, Carlo
2011

Abstract

High-resolution synchrotron radiation x-ray powder diffraction (HR-XRPD) combined with Hf L3-edge extended x-ray absorption fine structure allowed us to determine the structure of a Hf-UiO-66 metal-organic framework (MOF) showing that it is isoreticular to Zr-UiO-66MOF [Cavka et al., J. Am. Chem. Soc. 130, 13850 (2008).]. Thermal gravimetric measurements (coupled with mass spectroscopy) and temperature-dependent synchrotron radiation XRPD proved the high thermal stability of the Hf-UiO-66 MOF. The Langmuir surface area (849 m2/g) combined with the high stability of the UiO-66 framework and with the high neutron absorption cross section of Hf suggest that among all microporous crystalline materials the Hf-UiO-66 MOF possesses the physical and chemical requirements for the interim storage of radioactive waste in a much safer way than is currently available. The first results proving the synthesis of a MOF material with UiO-66 topology realized by a B-containing linker are also reported, allowing a further improvement of the neutron shielding power of this class of materials.
XIX National Congress SILS - XXII National Congress SISN joint congresses
Trieste
September 1-3, 2011
-
22
22
http://webusers.fis.uniroma3.it/sils/convegni/convegno_2003/index.html
MOF; metallorganic frameworks; Hf-UiO-66; UiO-66; UiO-67; EXAFS; high resolution XRD
Diego Gianolio; Jenny Grazia Vitillo; Bartolomeo Civalleri; Silvia Bordiga; Merete Hansen Nilsen; Soren Jakobsen; Karl Petter Lillerud; Loredana Valenzano; Carlo Lamberti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/131228
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