Optimization of experimental conditions for the synthesis of Si-MCM-41 molecular sieves using different methods and silica sources

Cazula, Bárbara Bulhões; Oliveira, Lígia Gomes; Machado, Bruna Aparecida Souza; Alves, Helton José

doi:10.1016/j.matchemphys.2021.124553

Cited by 15 publications

(8 citation statements)

References 45 publications

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“…All the above results are consistent with the data in Ref. [36]. N 2 adsorption and desorption curves (Figure 3A) record that the synthesized Si-MCM-41 has type IV adsorption isotherms with type H1 hysteresis loops.…”

Section: Resultssupporting

confidence: 92%

“…Synthesis of Si-MCM-41 36 135.0 ml of ammonia and 500.0 ml of CTAB solution (0.05 mol/L, in water) was well mixed, and 50.4 ml of tetraethyl orthosilicate was added to the above solution slowly under vigorous stir. After adding, the mixture was stirred at 80 • C for 2 h and transferred to a sealed autoclave to be heated at 120 • C for 72 h. The product was obtained by filtrating, washing with water, drying at 80 • C, and calcining at 550 • C for 6 h.…”

Section: Methodsmentioning

confidence: 99%

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An ordered mesoporous hydroxyapatite: Preparation, loading, and sustained releasing to ciprofloxacin

Gao

et al. 2022

J Am Ceram Soc.

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A kind of new mesoporous hydroxyapatite (noted as mesoHA) with about 2.4 nm average porous diameter was successfully prepared by casting Ca2+ and H2PO4− ions on the inner channel surface of Si‐MCM‐41 and dissolving the Si‐MCM‐41 in alkali soluble, and the porous material was used as a pH‐responsive platform to adsorb and release ciprofloxacin molecules. A maximum mass of 0.51 mg of ciprofloxacin (noted as Cip) was loaded on 1.00 mg of the host, and the release rate of the drug was found increasing with the acidic increase of the external solution environment (based on the stability of mesoHA) that simulated basic composition to human plasma. About 88.5% of Cip was released from the platform when environmental pH value was about 4.8, which provides a new method on utilizing antibiotics drugs efficiently, for the host mesoHA is friendly to human body.

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Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

An ordered mesoporous hydroxyapatite: Preparation, loading, and sustained releasing to ciprofloxacin

Gao

et al. 2022

J Am Ceram Soc.

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“…The change in the format of the diffractograms (Fig. 6) was confirmed by the refinement data; it was possible to note that the amount of quartz phase increased in all activated carbons synthesized from ashes, especially the A.C. (IV) in which its composition was 100% quartz; this is relevant data that showed that this material can be used as a source of crystalline SiO 2 in various processes from catalyst synthesis, molecular sieves, and zeolites, in addition to being used in energy applications and civil construction [65][66][67][68].…”

Section: Adsorbent Characterizationsupporting

confidence: 57%

Production of nanostructured crystalline composite using residual ashes from flocculated sludge burning process in a poultry slaughterhouse wastewater treatment system

et al. 2022

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Nanostructured crystalline composite (activated carbon) was synthesized from residual ashes of the burning process of the sludge generated in the flotation step of a poultry slaughterhouse and was used for Allura red dye adsorption. The ashes were chemically activated using two types of reagents, H 2 O 2 and H 3 PO 4 , and the structure, morphology, and surface of the adsorbents were characterized by different techniques such as scanning electron microscopy with energy dispersive spectroscopy (SEM/ EDS), N 2 adsorption/desorption isotherms with Brunauer-Emmett-Teller (BET) method and Barret-Joyner-Hallenda (BJH) method, Fourier transform infrared spectroscopy (MID/FTIR), X-ray diffraction (XRD), and the point of zero charge (PZC). The adsorbent synthesized with H 3 PO 4 at 400 ºC displayed the best performance in removing dye molecules in 10 mg.L -1 solution, with a removal rate of approximately 100% when using a concentration of 2 g.L -1 in particle size of 0.42 mm. Besides that, the adsorbent synthesized with H 3 PO 4 had a particle diameter of approximately 15 Å, a size corresponding to the nanometer range, presented a crystallinity structure with well-defined phases such as quartz and the major elements in the composition were carbon and silicon. The surface area of the ashes enlarged from 14.71 to 448.1 m 2 .g -1 when H 3 PO 4 was used as an activator, producing a high-quality adsorbent, with an excellent cost-benefit, being it possible to be produced for a price of 9.35 USD.kg -1 , a price lower than the commercial activated carbon, making it a promising candidate for application in an industrial environment.

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“…Oliveira et al [ 13 ] carried out synthesis of MCM-41 for 1 h at 60 °C ( Table 1 ) and 80 °C in a CEM microwave reactor and calcined in a muffle for 6 h at 550 °C, obtaining an S BET of 999 and 744 m 2 g −1 , respectively. Cazula et al [ 14 ] synthesized MCM-41 varying the silica sources (TEOS and rice husks) for 2 h, calcining in a muffle at 520 °C for 6 h. The authors obtained S BET between 200 and 1300 m 2 g −1 . Both studies aimed to produce MCM-41, and showed similar surface areas; however, they required a longer time for synthesis and removal of the surfactant.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis and Surfactant Removal from MCM-41 Using Microwave Irradiation

Oliveira,

Barboza,

Silva

et al. 2024

Molecules

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This research pioneers the application of microwave irradiation as an innovative strategy for one-pot synthesis and surfactant elimination (cetyltrimethylammonium bromide—CTAB) from MCM-41, introducing a rapid and efficient methodology. MCM-41 silica is widely utilized in various applications due to its unique textural and structural properties. Nonetheless, the presence of residual surfactants after synthesis poses a challenge to its effective application. MCM-41 synthesis, conducted in a microwave reactor at 60 °C, provided a result within 0.5 to 1 h. Comprehensive analyses of structural, chemical, morphological, and surface characteristics were undertaken, with a focus on the impact of synthesis time on these properties. Surfactant extraction involved the use of ethanol as a solvent at 120 °C for 6 min within the microwave reactor. The acquired particles, coupled with the properties of textural and structural features, affirmed the efficacy of the synthesis process, resulting in the synthesis of MCM-41 within 36 min. This study presents the first instance of one-pot synthesis and surfactant removal from MCM-41 using a microwave reactor. The proposed method not only addresses the surfactant removal challenge, but also substantially accelerates the synthesis process, thereby enhancing the potential for MCM-41’s application in diverse fields.

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Optimization of experimental conditions for the synthesis of Si-MCM-41 molecular sieves using different methods and silica sources

Cited by 15 publications

References 45 publications

An ordered mesoporous hydroxyapatite: Preparation, loading, and sustained releasing to ciprofloxacin

An ordered mesoporous hydroxyapatite: Preparation, loading, and sustained releasing to ciprofloxacin

Production of nanostructured crystalline composite using residual ashes from flocculated sludge burning process in a poultry slaughterhouse wastewater treatment system

One-Pot Synthesis and Surfactant Removal from MCM-41 Using Microwave Irradiation

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