Microporous and Mesoporous Materials in Decontamination of Water Process

Fonseca-Correa, Rafael A.; Murillo-Acevedo, Yesid; Moreno–Piraján, Juan Carlos

doi:10.5772/64393

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…The hydrophobic part is made of propylene oxide, while the hydrophilic part is made of ethylene oxide. The process occurs in an acidic medium in two steps: (1) the formation of micelles with hydrophobic groups inward and hydrophilic groups outward; (2) the interaction between water molecules and alkylene oxides as a result of hydrogen bonds [28,29].…”

Section: Synthesis Of Sba-15mentioning

confidence: 99%

A Review of the Application of Resorcinarenes and SBA-15 in Drug Delivery

et al. 2022

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Due to the diseases that people face today, scientists dedicate a part of their research to the synthesis, characterization, and study of functional compounds for controlled drug delivery. On the one hand, resorcinarenes are macrocycles obtained by condensation reactions of resorcinol and aldehyde. They include an upper and a lower rim functioning with different groups that confer solubility to the macrocycle and favor interactions with other compounds, therefore the hydroxyl groups on the upper rim improve the formation of hydrogen bonds. Additionally, resorcinarenes feature a cavity studied for forming host-guest complexes. SBA-15, on the other hand, is a mesoporous silica characterized by ordered pores in its structure and a large surface area. As a result of its properties, it has been used for several purposes, including absorbents, drug delivery, catalysis, and environmental processes. This review shows the recent advances in synthesis methods, characterization, micelle formation, interaction with other compounds, and host-guest procedures, as well as techniques for evaluating toxicity, drug retention, and their preliminary uses in pharmacology for macrocycles, such as resorcin[4]arenes and SBA-15.

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Section: Synthesis Of Sba-15mentioning

confidence: 99%

A Review of the Application of Resorcinarenes and SBA-15 in Drug Delivery

et al. 2022

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“…The building of the silica walls and the arranging of micellar rods in a hexagonal pattern occur simultaneously. That is: on one hand silica precursor is polymerized on the PEO chains, on the other hand, the decreased water content results in a reduced curvature of the micelle [4].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Applications of Large Pore Sulfonic Acid-Functionalized SBA-15 Mesoporous Silica for Esterification

Erdem

Öksüzoğlu

2018

Open Chemistry

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We report the preparation of pore expanded and sulfonic acid functionalized mesoporous silica catalysts by using different kinds of swelling agents such as 1,3,5-trimethyl benzene (TMB), n-decane (D), n-tridecane (TD), and n-hexadecane (HD) at two different ratios of swelling agent/surfactant. Non-swelled mesoporous silica catalyst, SBA-15-SO3H, was also prepared for comparison. The performance of the sulfonic acid functionalized solid acid catalysts by using one-pot synthesis procedure was evaluated in terms of their catalytic activity in the esterification of propionic acid with methanol. The catalysts have been characterized by X-ray diffraction to investigate the phase transition between the hexagonally packed arrangement of cylindrical pores and mesocellular silica foams (MCF), and N2 adsorption/desorption technique in terms of pore size and distributions. It was concluded from the XRD and N2 adsorption/desorption analyses that hexagonally packed and cylindrical pore structure is maintained only for low ratio of swelling agent/surfactant and the increase of the dimension of a template micelle is accompanied by an increase in structural disruption, which was attributed to the phase transition from highly ordered hexagonal arrangement to mesocellular foam (MCF) phase with large nodded pore structures rather than cylindrical pores. Among the different swelling agents, TMB and D were found to be effective for the increase in pore diameter (up to 8 and 7.8 nm), whereas, TD and HD (6.6 nm) are effective to maintain the ordered X-ray diffraction patterns resulting mesoporous materials without giving enlargement of pore diameter in comparison with TMB and D. Pore expanded catalysts, SBA-15-SO3H-TMB-0.1 and SBA-15-SO3H-D-0.1, exhibit 68 and 43% enhancement in turnover frequency toward propionic acid methanol esterification, respectively, over non-swelled SBA-15-SO3H, despite possessing similar acid strengths. The increased activity especially for SBA-15-SO3H-TMB-0.1 and SBA-15-SO3H-D-0.1 likely reflects the accessibility to the active sulfonic acid sites as well as acidity.

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“…The micellar rods arrange in a hexagonal pattern while the silica walls are built. The polymerization is simultaneous to the elongation and the silica precursor is polymerized on the PEG chains, and the water content in this area decreases to produce a change in the polarity resulting in a reduced curvature of the micelle (Figure 2.4) [28,69]. The porous structures are not mesoporous because of the hexagonal arrangement of cylindrical aggregates.…”

Section: Mesoporous Santa Barbara Amorphous-15 (Sba-15)mentioning

confidence: 99%

“…The porous structures are not mesoporous because of the hexagonal arrangement of cylindrical aggregates. On the other hand, the PEG penetrates the pore walls, resulting in the microporous production after calcination as illustrated in Figure 2.5 [69]. This process allows to remove the surfactants from SBA-15.…”

Section: Mesoporous Santa Barbara Amorphous-15 (Sba-15)mentioning

confidence: 99%

Dehydration and oxidative dehydrogenation of ethanol over SBA-15 based catalysts prepared by sol-gel and hydrothermal methods

Autthanit

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In this present study, characteristics and catalytic properties of zirconium (Zr) and bimetal (Zr and La) containing in SBA-15 catalysts and different VOx/SBA-15 catalysts were determined and well related. The study was divided into three parts. Regarding to the first part, zirconium (Zr) and bimetal (Zr and La) containing in SBA-15 synthesized by sol-gel and hydrothermal methods were compared. The results showed that the incorporation of Zr and bimetal (Zr and La) had an effect on the textural properties of both synthesized SBA-15 catalysts. Surface acidity in the SBA-15 suggests new active sites, especially Br?nsted acid type. In the second part, all SBA-15 catalysts synthesized by both methods were first used as catalysts for the catalytic dehydration of ethanol to ethylene. The result shows that the performance of these SBA-15 supported catalysts in ethanol dehydration is also related with the alteration of surface acidity caused by the introduction of Zr and Zr-La. According to further modified of these catalysts, zirconium (Zr) and bimetal (Zr and La) containing in SBA-15 catalysts were selected to study in the third parts with vanadium oxide or VOx species modification in order to be used in non-oxidative dehydrogenation and oxidative dehydrogenation of ethanol. It is worth noting that isolated monomeric VOx species, as well as the amounts of weak basic sites essentially played important role in non-oxidative dehydrogenation and oxidative dehydrogenation of ethanol to acetaldehyde.

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Microporous and Mesoporous Materials in Decontamination of Water Process

Cited by 5 publications

References 18 publications

A Review of the Application of Resorcinarenes and SBA-15 in Drug Delivery

A Review of the Application of Resorcinarenes and SBA-15 in Drug Delivery

Catalytic Applications of Large Pore Sulfonic Acid-Functionalized SBA-15 Mesoporous Silica for Esterification

Dehydration and oxidative dehydrogenation of ethanol over SBA-15 based catalysts prepared by sol-gel and hydrothermal methods

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