Rapid microwave-assisted synthesis of saponites and their use as oxidation catalysts

Microwave synthesis of delaminated acid saponites using quaternary ammonium salt or polymer as template. Study of pH influence

“…Bands that appeared outside the 1500-600 cm − 1 interval and which were observed in all samples include: a band around 3680 cm −1 , due to O-H stretching in the octahedral sheet (Mg-OH) and a band around 3450 cm −1 corresponding to the stretching modes of water molecules whose bending mode appeared at 1664 cm −1 . The shoulder at 3220 cm −1 could be assigned O-H stretching mode of H-bridged groups whereas the bending vibration mode of Si-O-Mg was detected at about 465 cm −1 (Rusell and Fraser, 1994;Trujillano et al, 2011).…”

“…1). The presence of this reflection involved an ordering in the c-direction (Carrado and Xu, 1998;Prieto et al, 1999;Srodon, 2006;Trujillano et al, 2011). Hence, the sample aged by conventional heating at pH 13 (SC13) showed higher ordering than the other samples.…”

“…The preparation of the slurry for the synthesis of sodium saponites at pH = 13 (4 samples) was carried out following the method described by Trujillano et al (2011) with some modifications. A CO 3 2− /HCO 3 − buffer, pH 13, was prepared by dissolving 3.63 g of NaOH and 6.56 g of NaHCO 3 in 50 mL double distilled water.…”

Dynamics of Water Confined in Saponite Clay

“…In this work, synthetic saponite clays are produced by microwave heating. This process is known to be cleaner, faster and more efficient compared to other conventional heating methods [3].…”

Saponites containing divalent transition metal cations in octahedral positions — Exploration of synthesis possibilities using microwave radiation and NMR characterization

“…Preparing synthetic clay materials may allow modulating and controlling their chemical composition and physical properties, but high temperatures and pressures are needed in the classical hydrothermal synthesis, that has been sorted out by the use of new synthesis methods, particularly microwave ovens. In addition, the composition of the solids can be widened, particularly by incorporation of cations usually not found in Nature to the octahedral positions of the structure (Jaber and Miéhé-Brendlé, 2005;Yao et al, 2005;Trujillano et al, 2010Trujillano et al, , 2011Vicente et al, 2010Vicente et al, , 2011Jaber et al, 2013Jaber et al, , 2014.…”