Amine-modified SBA-15 and MCF mesoporous molecular sieves as promising sorbents for natural antioxidant. Modeling of caffeic acid adsorption

Moritz, Michał; Geszke-Moritz, Małgorzata

doi:10.1016/j.msec.2015.12.093

Cited by 20 publications

(10 citation statements)

References 44 publications

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“…This is an indication that basic adsorption sites are partially available. Such a low degree of accessibility was also observed for the adsorption of caffeic acid onto SBA-15 and MCF sorbents that were modified with 3-aminopropyl groups [48] or boldine alkaloid onto propyl-sulfonic acid-modified mesoporous silicas [49].…”

Section: Resultsmentioning

confidence: 84%

“…Previous studies that were also conducted in 2-propanol revealed better adsorption efficiency exceeding 90% for adsorption of carboxylic acids onto the surface of SBA-15 silica modified with 3-aminopropyl groups. It should be noted that examined adsorbates, such as diflunisal [38], caffeic acid [48], rosmarinic acid [103], and sinapic acid [104], are characterized by a slightly lower molar mass as compared to 18β-GA.…”

Section: Discussionmentioning

confidence: 99%

“…These models assume that the adsorption process is related to the micropore volume filling oppositely to layer-by-layer adsorption on the pore walls [82]. The Dubinin-Radushkevich and Dubinin-Astakhov equations include the additional heterogeneity parameter n, which for Dubinin-Radushkevich equation is 2 [48]. Thus, the Dubinin-Astakhov equation in which the heterogeneity factor is an adjustable, experimentally-derived parameter, is more general [82].…”

Section: Methodsmentioning

confidence: 99%

“…Amine-functionalized SBA-15 material was applied for the removal and recovery of hydroxytyrosol and tyrosol in olive mill wastewater [47]. The application of SBA-15 and MCF silicas that were modified with amine functions for the adsorption of caffeic acid was reported [48]. Pure and propyl-sulfonic acid-modified SBA-15, SBA-16, MCF, and PHTS materials were employed as efficient sorbents for boldine alkaloid [49,50,51].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data

Moritz

Geszke-Moritz

2019

Materials

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This study aimed at the adsorption of 18β-glycyrrhetinic acid (18β-GA), a pentacyclic triterpenoid derivative of oleanane type, onto functionalized mesoporous SBA-15 silica and non-porous silica (Aerosil®) as the reference adsorbent. Although 18β-GA possesses various beneficial pharmacological properties including antitumor, anti-inflammatory, and antioxidant activity, it occurs is small amounts in plant materials. Thus, the efficient methods of this bioactive compound enrichment from vegetable raw materials are currently studied. Siliceous adsorbents were functionalized while using various alkoxysilane derivatives, such as (3-aminopropyl)trimethoxysilane (APTMS), [3-(methylamino)propyl]trimethoxysilane (MAPTMS), (N,N-dimethylaminopropyl)trimethoxysilane (DMAPTMS), and [3-(2-aminothylamino)propyl] trimethoxysilane (AEAPTMS). The effect of silica surface modification with agents differing in the structure and the order of amine groups on the adsorption capacity of the adsorbent and adsorption efficiency were thoroughly examined. The equilibrium adsorption data were analyzed while using the Langmuir, Freundlich, Redlich-Peterson, Temkin, Dubinin-Radushkevich, and Dubinin-Astakhov isotherms. Both linear regression and nonlinear fitting analysis were employed in order to find the best-fitted model. The adsorption isotherms of 18β-GA onto silicas functionalized with APTMS, MAPTMS, and AEAPTMS indicate the Langmuir-type adsorption, whereas sorbents modified with DMAPTMS show the constant distribution of the adsorbate between the adsorbent and the solution regardless of silica type. The Dubinin-Astakhov, Dubinin-Radushkevich, and Redlich-Peterson equations described the best the process of 18β-GA adsorption onto SBA-15 and Aerosil® silicas that were functionalized with APTMS, MAPTMS, and AEAPTMS, regardless of the method that was used for the estimation of isotherm parameters. Based on nonlinear fitting analysis (Dubinin-Astakhov model), it can be concluded that SBA-15 sorbent that was modified with APTMS, MAPTMS, and AEAPTMS is characterized by twice the adsorption capacity (202.8–237.3 mg/g) as compared to functionalized non-porous silica (118.2–144.2 mg/g).

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Section: Resultsmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data

Moritz

Geszke-Moritz

2019

Materials

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“…It has several features that allow improved adsorption characteristics: (1) it has a high specific surface area and a large pore volume [10,11]; (2) its surface functional groups are easily changed using silica sources containing different functional groups [12,13]; and (3) its pore size, particle size, and particle morphology can be controlled by synthesis condition [14]. For example, Fan et al investigated lysozyme adsorption on MPS materials that had different particle morphologies (i.e.…”

Section: Introductionmentioning

confidence: 99%

Elucidating the effect of different amino-functionalized spherical mesoporous silica characteristics on ribonucleic acid selectivity and adsorption capacity

Hikosaka

Nagata

Tomita

et al. 2018

Journal of Asian Ceramic Societies

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A Continuous‐Flow Microreactor for Knoevenagel Condensation of Ethyl Cyanoacetate with Benzaldehyde: The Effect of Grafted Amino Groups on Catalytic Activity

2023

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Ethyl α‐cyanocinnamate was synthesized in the Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate in flow monolithic microreactor of 0.63 cm3 volume. The catalytically active core was made of silica monolith modified with various amine group precursors. Structural properties of the support, surface density of NHx groups, and catalytic activity were investigated. It was found that the poly‐ or di‐amine groups attached to the silica surface appeared to be more effective than the aminopropyl groups. Microreactors grafted with diamine functional groups, accompanied by hydrophobic methyl groups, showed the highest activity and stability. It was proved that the decisive role on the activity of catalysts was exerted by the presence of primary amines in diamine chain. The reaction conditions were optimized and it was found that almost full substrate conversion could be achieved in 6 min at 50 °C in the microreactor with low concentration of diamine groups equal to 0.33 mmol g−1.

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Amine-modified SBA-15 and MCF mesoporous molecular sieves as promising sorbents for natural antioxidant. Modeling of caffeic acid adsorption

Cited by 20 publications

References 44 publications

The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data

The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data

Elucidating the effect of different amino-functionalized spherical mesoporous silica characteristics on ribonucleic acid selectivity and adsorption capacity

A Continuous‐Flow Microreactor for Knoevenagel Condensation of Ethyl Cyanoacetate with Benzaldehyde: The Effect of Grafted Amino Groups on Catalytic Activity

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