The transformation of synthetic hectorite in the presence of Cu(II)

Fischer, H.; Weidler, Peter G.; Grobéty, Bernard; Luster, Jörg; Gehring, A. U.

doi:10.1346/ccmn.2009.0570201

Cited by 3 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There was no significant difference between XRD patterns of Lap and Lap Al. All the patterns of samples exhibited the widened reflections typical for disordered hectorite structure with peaks at 6.8, 19.6, 28.0, 35.0 and 60.8°(2θ), which are attributed to the (001), (110, 002), ( 004), (130,200) and (060,330) crystal planes, respectively (Fischer et al 2009).…”

Section: Thermodynamic Modelingmentioning

confidence: 98%

Natural water defluoridation by adsorption on Laponite clay

Braik

Amor

Michelin

et al. 2022

Water Science and Technology

View full text Add to dashboard Cite

Safe drinking water is a necessity for every human being, however clean water is scarce and not easily available due to natural geochemical factors or pollutant industrial activity. Many issues involving water quality could be greatly improved using clays as adsorbents. We highlight for the first time, the uptake of fluoride from natural water by Laponite, synthetic Hectorite clay, in raw and modified state. A series of batch adsorption experiments were carried out in order to evaluate the adsorption potential of the different parameters. The optimized parameters were: contact time, adsorbent dose and pH. It was found that fluoride uptake from natural water was better using raw Laponite and inorganic-modified Laponite than using organic-modified Laponite clays. Adsorbents were characterized before and after fluoride adsorption by X-ray diffraction, X-ray fluorescence, FTIR, Thermo Gravimetric Analyses and 19F solid state NMR spectroscopy. The experimental data showed that both Langmuir and Freundlich models fitted well adsorption isotherm. Thermodynamic parameters such as the Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were calculated. These parameters indicated that fluoride adsorption onto Laponite were non spontaneous and endothermic in temperature range between 25 and 45 °C.

show abstract

Section: Thermodynamic Modelingmentioning

confidence: 98%

Natural water defluoridation by adsorption on Laponite clay

Braik

Amor

Michelin

et al. 2022

Water Science and Technology

View full text Add to dashboard Cite

show abstract

“…The influence of Cu(II) on the hydrothermal and thermal transformations of a synthetic hectorite was investigated in [251]. The presence of Cu(II) during the hydrothermal treatment increased the crystallite size of the produced hectorite.…”

Section: Synthesis Thermal Processing Ceramics and Related Fieldsmentioning

confidence: 99%

Applications of X-ray Powder Diffraction Microstructural Analysis in Applied Clay Mineralogy

Bastida,

Pardo-Ibañez

2024

Minerals

View full text Add to dashboard Cite

Clay minerals and sheet silicates are the main constituents of lutites and clays. These materials are relevant in earth science research as well as in economic geology because of the great variety of applications, based on their particular features at different levels of aggregation in mineral assemblages and on the microstructural and structural characteristics of the mineral constituents frequently characterized by micro- and nanocrystalline appearance. Thus, X-ray diffraction is a main tool for fundamental and applied research of these materials. The present review concerns their microstructural research from powder X-ray diffraction data.

show abstract

Influence of Chain Lengths and Loading Levels on Interlayer Configurations of Intercalated Alkylammonium and Their Transitions in Rectorite

Jiang

Chen

et al. 2010

Langmuir

View full text Add to dashboard Cite

There have been extensive studies on intercalation of alkylammonium into swelling clay minerals for the purpose of surface charge determination of the clay minerals, as well as their interlayer configurations in the clay minerals. The most accepted findings are that the intercalated alkylammonium molecules adopted horizontal monolayer, bilayer, pseudotrilayer, and vertical paraffin-like configurations in the interlayer space of the swelling clay minerals depending on the chain length and loading level of the alkylammonium used. This study examined the interlayer configurations of intercalated alkyltrimethylammonium and their transition structure as a function of alkylammonium inputs and chain lengths. As the amount of alkylammonium intercalation increased, the bilayer configuration of the intercalated alkylammonium was absent during a transition from a horizontal monolayer to a pseudotrilayer intercalation. Instead, the transition structure involved a mixed layer made of rectorite intercalated with one layer and rectorite intercalated with pseudotrilayer of alkylammonium molecules. When intercalated in horizontal monolayer, the alkylammonium molecules took a random, more gauche-like arrangement. On the other hand, as alkylammonium molecules adopted a pseudotrilayer, particularly the vertical paraffin-like arrangement, a more ordered all-trans configuration was achieved. As layer charge is one of the most important properties of swelling clay minerals, commonly determined by intercalation of n-alkylammonium ions, the identification of mixed-layer transition structure in this study may suggest a need for further investigations on principles of layer charge determination of swelling clays by the alkylammonium method.

show abstract

The transformation of synthetic hectorite in the presence of Cu(II)

Cited by 3 publications

References 31 publications

Natural water defluoridation by adsorption on Laponite clay

Natural water defluoridation by adsorption on Laponite clay

Applications of X-ray Powder Diffraction Microstructural Analysis in Applied Clay Mineralogy

Influence of Chain Lengths and Loading Levels on Interlayer Configurations of Intercalated Alkylammonium and Their Transitions in Rectorite

Contact Info

Product

Resources

About