The role of hydration water in inorganic M+n -magadiites (M+n = K+, Ca+2, Mg+2): Advances in structural and electronic analysis by DFT calculations.

Silva, Bruna Nádia N.; Pastore, Heloise O.; Leitão, Alexandre A.

doi:10.1016/j.clay.2022.106749

Cited by 2 publications

(10 citation statements)

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“…This variation could be related to the method and the temperatures of drying and the temperatures that affected the content of water molecules between the interlayer spacing of the silicate layers [28]. The variation of the position of this reflection was also reported to be related to the type of exchangeable cations between the magadiite or the kenyaite layers [29,30].…”

Section: Effect Of Temperaturementioning

confidence: 94%

“…The 29 Si MAS NMR offers an additional method to characterize the obtained silicate layered materials. Different runs were performed to distinguish between the different environments of the Si species and to estimate the ratio of Q 4 Si species to the Q 3 Si ones.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…Different runs were performed to distinguish between the different environments of the Si species and to estimate the ratio of Q 4 Si species to the Q 3 Si ones. The 29 Si MAS NMR spectra of the Na-magadiite samples prepared from the four silica sources at a temperature of 150 • C and for two days (runs 2, 21, 25, and 30) are presented in Figure 11 (left). The 29 Si MAS NMR spectra of materials prepared from Ludox AS40 at 150 °C for different reaction times (runs 24-28) are presented in Figure S7.…”

Section: Si Mas Nmr Datamentioning

confidence: 99%

“…The 29 Si MAS NMR spectra of the Na-magadiite samples prepared from the four silica sources at a temperature of 150 • C and for two days (runs 2, 21, 25, and 30) are presented in Figure 11 (left). The 29 Si MAS NMR spectra of materials prepared from Ludox AS40 at 150 °C for different reaction times (runs 24-28) are presented in Figure S7. The Ludox-AS 40 was selected as a silica source because the Na-magadiite phase was obtained in a major phase after 5 days of hydrothermal treatment (run 27).…”

Section: Si Mas Nmr Datamentioning

confidence: 99%

“…The hydrothermal treatment method was chosen at various temperatures and time periods. The physical and chemical properties of the as-synthesized samples were analyzed via X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TGA/DTA), X-ray fluorescence spectrometer (XRF), scanning electron microscopy (SEM) associated with an EDX system, nitrogen adsorption, Fourier Transform Infrared spectroscopy (FTIR), and solid 29 Silicon MAS NMR. The application of the Na-magadiite materials was performed as a model in the water treatment to remove Basic Blue-41 (BB-41) from artificially polluted water.…”

Section: Introductionmentioning

confidence: 99%

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Parameters Synthesis of Na-Magadiite Materials for Water Treatment and Removal of Basic Blue-41: Properties and Single-Batch Design Adsorber

Alanazi,

Al Dmour,

Popoola

et al. 2023

Inorganics

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Na-magadiite materials were prepared from a gel containing a silica source, sodium hydroxide, and water via hydrothermal treatment at different temperatures (130 °C to 170 °C) and periods of time (1 day to 10 days). In this study, four silica sources were selected (fumed silica, colloidal silica, Ludox HS-40%, and Ludox AS-40%). Variable conditions such as sodium hydroxide and water contents were explored at a specific temperature and reaction time. The obtained materials were characterized by using X-ray diffraction (XRD), thermogravimetry differential thermal analysis TG-DTA, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), Fourier Transform Infrared spectroscopy (FTIR), solid 29Si magic angle spinning magnetic nuclear resonance (MAS MNR, and nitrogen adsorption isotherms. A pure Na-magadiite phase was obtained from the four silica sources at a synthesis temperature of 150 °C after a period of one to two days with a characteristic basal spacing of 1.54 nm. At a longer reaction time of 3 days and a higher temperature of 170 °C, Na-kenyaite with a basal spacing of 2.01 nm was achieved, in addition to a quartz phase. The content of water or sodium hydroxide in the gel affected the nature of the prepared phases. A cauliflower-like morphology was obtained from colloidal silica sources, while a different morphology was achieved using solid fumed silica. The 29Si solid NMR confirmed the presence of Q3 and Q4 silicon sites in the Na-magadiite materials. The optimal Na-magadiite materials at 150 °C for 2 days were assessed for their ability to remove Basic Blue-41 dye from artificially contaminated aqueous solution. The Langmuir equation was used to estimate the maximum removal capacity. A maximum removal capacity of 219 mg/g was achieved using Na-magadiite prepared from a Ludox-HS40% silica source, and a maximum removal capacity of 167 mg/g was observed for Na-magadiite prepared from fumed silica. Basic Blue-4’s removal percentage was enhanced at basic pH levels (8 to 10) to a maximum of 95%. These materials could be regenerated for seven cycles of reuse with a reduction of 27 to 40% of the original values. Therefore, Na-magadiite materials are promising and efficient removal agents for the removal of Basic Blue-41 from effluents.

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Section: Effect Of Temperaturementioning

confidence: 94%

Section: Thermogravimetric Analysismentioning

confidence: 99%