A Review: Fundamental Aspects of Silicate Mesoporous Materials

ALOthman, Zeid A.

doi:10.3390/ma5122874

Cited by 1,610 publications

(825 citation statements)

References 110 publications

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“…Such a type of hysteresis loop points out that these mesoporous materials have slit-shaped pores, which indicates that there are no limitations for adsorption at high p/p 0 . This is a typical feature of non-rigid aggregates of plate-like particles [38]. This plate-like structure was also evident in the XPD patterns (discussed above), and is confirmed with the respective N 2 sorption isotherms.…”

Section: Porosity Packing and Thermal Stabilitysupporting

confidence: 77%

“…Since Br-Hec and I-Hec behave as mesoporous materials, the hysteresis loop of their sorption isotherms can be correlated with their texture. The sorption isotherms of both clay materials show the H 3 hysteresis loop, according to the IUPAC classification [38]. Such a type of hysteresis loop points out that these mesoporous materials have slit-shaped pores, which indicates that there are no limitations for adsorption at high p/p 0 .…”

Section: Porosity Packing and Thermal Stabilitymentioning

confidence: 87%

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Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

et al. 2017

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Abstract:The smectites represent a versatile class of clay minerals with broad usage in industrial applications, e.g., cosmetics, drug delivery, bioimaging, etc. Synthetic hectorite Na 0.7 (Mg 5.5 Li 0.3 ) [Si 8 O 20 ](OH) 4 is a distinct material from this class due to its low-cost production method that allows to design its structure to match better the applications. In the current work, we have synthesized for the first time ever nanoclay materials based on the hectorite structure but with the hydroxyl groups (OH − ) replaced by Br − or I − , yielding bromohectorite (Br-Hec) and iodohectorite (I-Hec). It was aimed that these materials would be used as phosphors. Thus, OH − replacement was done to avoid luminescence quenching by multiphonon de-excitation. The crystal structure is similar to nanocrystalline fluorohectorite, having the d 001 spacing of 14.30 Å and 3 nm crystallite size along the 00l direction. The synthetic materials studied here show strong potential to act as host lattices for optically active species, possessing mesoporous structure with high specific surface area (385 and 363 m 2 g −1 for Br-Hec and I-Hec, respectively) and good thermal stability up to 800 • C. Both materials also present strong blue-green emission under UV radiation and short persistent luminescence (ca. 5 s). The luminescence features are attributed to Ti 3+ /Ti IV impurities acting as the emitting center in these materials.

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Section: Porosity Packing and Thermal Stabilitysupporting

confidence: 77%

Section: Porosity Packing and Thermal Stabilitymentioning

confidence: 87%

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

et al. 2017

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“…Typically, MPSs synthesize tunable pore sizes and geometry in the presence of different cationic/anionic surfactants, which act as templates (Norhasyimi Rahmat 2010;Alothman 2012;Pal and Bhaumik 2013). MPSs of various structures, such as hexagonal, cubic and lamellar form are formed by varying the type of surfactant and surfactant/silica ratio.…”

Section: Synthesis and Functionalization Of Mpssmentioning

confidence: 99%

Review of the use of mesoporous silicas for removing dye from textile wastewater

Salahshoor

Shahbazi

2014

European Journal of Environmental Sciences

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The textile industry is a major user of dyes and hence an important source of water pollution, which poses a threat to aquatic as well as human life. Adsorption is a widely used technique for separating and removing dye from wastewater. Recently the use of mesoporous silica (MPSs) as an adsorbent in wastewater treatment has received considerable attention. MPSs are emerging as potential adsorbents because of their surface area, tunable and uniform pore structure, high pore volume, ordered pore structure, thermal and mechanical stability, and extraordinarily wide possibilities for functionalization to increase their adsorption capacity. In this paper the ability of MPSs to absorb dyes from aqueous solutions is reviewed. This article provides information on adsorption studies carried out under different operational conditions such as contact time, solution pH, temperature, agitation speed, etc. This review also summarizes and attempts to compare the equilibrium isotherm and kinetic models, and the thermodynamic studies that report the adsorption of dyes onto MPSs. The literature reviewed, indicate that SBA-MPSs have a higher adsorption capacity than MCM-MPSs and functionalized MPSs a better adsorption capacity than MPSs. It is evident from the literature that the potential of MPS based nano-sorbents being used for removing dyes from aqueous solution is very high. However, still more research work is needed on developing cost effective and more efficient MPS based nano-sorbents for use commercially.

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“…Moreover, it can be used as a host material to confine desired molecules due to extremely high surface area combined with a large and uniform pore size 38) . Calcium aluminate powder reacts with water in a complex hydration process.…”

Section: Discussionmentioning

confidence: 99%

Synthesized mesoporous silica and calcium aluminate cement fillers increased the fluoride recharge and lactic acid neutralizing ability of a resin-based pit and fissure sealant

2017

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This study evaluated the effect of different types of filler in a resin-based pit and fissure sealant on fluoride release, recharge, and lactic acid neutralization. Resin-based sealant was incorporated with 5% w/w of the following fillers: calcium aluminate cement (CAC), synthesized mesoporous silica (SI), a CAC and SI mixture (CAC+SI), glass-ionomer powder (GIC), and acetic acid-treated GIC (GICA). Sealant without filler served as control. The samples were immersed in deionized water or a lactic acid solution and the concentration of fluoride in the water, before and after fluoride recharge, and the lactic acid pH change, respectively, were determined. The CAC+SI group demonstrated the highest fluoride release after being recharged with fluoride gel. The CAC+SI group also demonstrated increased lactic acid pH. These findings suggest that a resin-based sealant containing synthesized mesoporous silica and calcium aluminate cement may enhance remineralization due to fluoride release and higher pH.

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A Review: Fundamental Aspects of Silicate Mesoporous Materials

Cited by 1,610 publications

References 110 publications

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

Review of the use of mesoporous silicas for removing dye from textile wastewater

Synthesized mesoporous silica and calcium aluminate cement fillers increased the fluoride recharge and lactic acid neutralizing ability of a resin-based pit and fissure sealant

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