Characterization of Spanish sepiolites by high-resolution solid-state NMR.
29Si NMR (MAS and CP/MAS) and 1H MAS NMR techniques were used to characterize four sepiolites, two of natural origin (commercialized under the names Pangel and Pansil) and the other two obtained from them by treatment with 2 M or 4 M H2SO4, respectively. These techniques were used to identify the structural and surface changes undergone by sepiolites by the effects of acid treatment and calcination. Various types of Si were detected; also, treatment with 4 M H2SO4 destroyed the sepiolite and produced fibrous silica.
Aramendía
M A
MA
Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Córdoba, Spain.
Borau
V
V
Jiménez
C
C
Marinas
J M
JM
Ruiz
J R
JR
D007554:Isotopes; D008278:Magnesium Sulfate / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D019016:Mineral Fibers; D012825:Silicon / Q000737:chemistry; D013499:Surface Properties
D007554:Isotopes; D019016:Mineral Fibers; D008278:Magnesium Sulfate; D012825:Silicon