Intercalation of Tb(III) into magadiite and characterization of Tb-intercalated magadiites

Chen, Yufeng; Bao, Yefeng; Zou, Yan; Yan, Yudong

doi:10.1180/claymin.2016.051.4.11

Cited by 6 publications

(1 citation statement)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Layered silicates such as magadiite (NaSi 7 O 13 (OH) 3 . 4H 2 O), kenyaite (Na 2 Si 22 O 41 (OH) 8 .6H 2 O) and kanemite (NaHSi 2 O 5 .3H 2 O) have recently become the subject of great interest due to their adsorptive and catalytic properties (Alarcón et al, 2005; Kalvachev et al, 2006; Park et al, 2009; Royer et al, 2010; Guerra et al, 2012; Kim et al , 2012; Chen et al, 2016). The structure of kenyaite is composed of silica layers and interlayer hydrated cations; each silica layer is built from three silica sheets instead of two, as in the case of magadiite (Wang et al, 2006).…”

mentioning

confidence: 99%

Characterization of organo-kenyaites: thermal stability and their effects on eosin removal characteristics

et al. 2018

View full text Add to dashboard Cite

Organo-kenyaites were prepared from a cetyltrimethylammonium hydroxide (C16TMAOH) solution and solid sodium kenyaite (Na2Si22O45.10H2O) mixture. The effect of the initial cetyltrimethylammonium solution on the structure of the intercalated materials was investigated by CHN analyses, X-ray diffraction (XRD), thermogravimetric analysis, SEM, and 29Si and 13C solid NMR techniques. For C16TMAOH concentration 0.25 mM, the Na+ cations were fully exchanged. Initial C16TMAOH concentrations higher than 0.25 mM had little effect on the intercalated amount of C16TMA+ cations. The organic cations content reached a plateau of 0.66 mmol/g. The arrangement model of C16TMA+ cations corresponded to a tilt of the organic cations to the silicate layers with an angle of 42° as deduced by XRD studies. The C16TMA+ cations exhibited mainly trans-configuration of the methyl chains, as was shown by solid 13C NMR. The thermal stability of the organo-silicates was studied using in situ FTIR and in situ XRD in the range 25–450°C. The C16TMA-kenyaites were stable at temperatures below 200°C. They collapsed at higher temperatures due to the decomposition of the intercalated surfactants. These organo-kenyaites were used to remove the acidic dye molecule, eosin. The removal tests were performed at varying conditions of initial dye concentrations, organic content in the organo-kenyaites and heating temperatures. In general, the organic modification improved the removal capacity of the Na-kenyaite from 2 mg of eosin/g to 60 mg of eosin/g, and this capacity was related to the organic contents and the calcination temperatures of the organo-kenyaites.

show abstract