Preparation and Characterization of Eu-Magadiite Intercalation Compounds

Abstract

The intercalation of europium ions (Eu3+) into the interlayer space of a layered silicate, magadiite, was conducted by ion-exchange reactions between magadiite and europium(III) chloride. X-ray diffraction and elemental analysis results indicated that Eu3+ cations were intercalated into the interlayer space of magadiite. The ion exchange between Eu3+ and Na+ occurred preferentially so that the adsorbed Eu3+ amounts were controlled quantitatively. Thermal transformation of the original layered structure was suppressed by the intercalation of Eu3+. The resulting intercalation compounds exhibited photoluminescence arising from the intercalated Eu3+. The luminescence intensity varied in accordance with the amount of Eu3+ absorbed, suggesting that the self-quenching occurred at higher loading levels. The luminescence intensity was also changed by the heat treatment, corresponding to the change in the surroundings of the Eu3+ adsorbed, induced by the removal of the adsorbed water molecules and the hydroxyl groups of the silicate.

Structural incorporation of Cm(III) in trioctahedral smectite hectorite: A time-resolved laser fluorescence spectroscopy (TRLFS) study

“…However, due to their structural complexity, several molecular-level sorption mechanisms have been identified: (i) outer-sphere surface complexation at the (0 0 1) basal surfaces, (ii) innersphere surface complexation at the (h k 0) edge surfaces, (iii) cation exchange within the interlayer, and (iv) structural incorporation in the octahedral layer. Adsorption and exchange phenomena (i-iii) and the associated molecularlevel reaction mechanisms were studied extensively in the past (Bradbury and Baeyens, 2002; , 1999Stumpf et al, 2001Stumpf et al, , 2002Stumpf et al, , 2004aCoppin et al, 2002Coppin et al, , 2003Mizukami et al, 2002;Kowal-Fouchard et al, 2004;Rabung et al, 2005). On the basis of a fundamental process understanding, a robust surface complexation model can be developed Rabung et al, 2005).…”

Advanced Techniques of Saponite Recovery from Diamond Processing Plant Water and Areas of Saponite Application

“…Saponite is known [61][62][63][64][65][66][67][68][69][70][71][72][73][74] to be used in various technological processes as an ingredient of sorbents, catalysts, carrying agents, thickeners and pigments, either in natural or activated form.…”

“…Intercalating of Eu 3+ ions into the interlayer space of a layered silicate (magadiite) occurred via the ion-exchange reactions between magadiite and europium chloride [67]. As indicated by both the X-ray diffraction and elemental analyses, the Eu 3+ cations were intercalated into the magadiite interlayer space.…”

Изменение Строения Поверхности Гетерогенного Нанокристаллического Тела (Песчаника) При Трении

“…10 показан PL спектр темных областей на поверхности песчаника после трения. Полосы 1.74, 1.8 и 1.98 eV в этом спектре приписа-ны ионам Fe 3+ и Eu 3+ в монтмориллоните [16,17], а 2.45 eV -кислородным вакансиям в анатазе [18].…”