Non-Hydrothermal Synthesis of Cylindrical Mesoporous Materials: Influence of the Surfactant/Silica Molar Ratio

Barrera, Deicy; Villarroel-Rocha, Jhonny; Marenco, Luis N.; Oliva, Marcos Iván; Sapag, Karim

doi:10.1260/0263-6174.29.10.975

Cited by 25 publications

(13 citation statements)

References 48 publications

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“…The selected mesoporous materials include two ordered mesoporous silica materials (MCM-41 and SBA-15) and three nanostructured mesoporous carbons materials (CMK-3_A, CMK-3_B and CMK-3_C). The MCM-41 and SBA-15 samples were synthetized according to the nonhydrothermal procedure described in Barrera et al (2011).…”

Section: Mesoporous Materialsmentioning

confidence: 99%

Importance of the α_s-plot Method in the Characterization of Nanoporous Materials

Villarroel-Rocha

Barrera

Blanco

et al. 2013

Adsorption Science & Technology

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In this work, an exhaustive study of the calculation of micropore and mesopore volumes with α s-plot method as proposed by Professor Sing is carried out. The method is critically compared with other similar methods such as the Dubinin-Radushkevich, t-plot and those based on density functional theory (DFT). For comparison purposes, several nanoporous materials with different chemical properties were selected. The analysis was segregated into three categories: (i) microporous materials, in which the analyzed samples are activated carbons (ACs) with different pore-size distributions, a single-walled carbon nanotube (SWNT) and a zeolite (MS5A); (ii) mesoporous materials, including ordered mesoporous carbons (CMK-3) and ordered mesoporous siliceous materials (MCM-41 and SBA-15); and (iii) micro-mesoporous materials, in which pillared clays (PILCs) obtained with different metals (Al, Si, Fe and Zr) were studied. To apply the α s-plot method, several standard isotherms previously reported by other authors were considered for the analysis of microporous and mesoporous materials. Furthermore, a series of four reference materials for PILCs were synthesized and their high-resolution nitrogen adsorption isotherms were measured and reported. The results obtained by the α s-plot method are consistent with those obtained by DFT methods. This consistency highlights the importance of the use of this reliable and versatile method, where the correct selection of the standard isotherm is the most critical aspect to be considered.

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Section: Mesoporous Materialsmentioning

confidence: 99%

Importance of the α_s-plot Method in the Characterization of Nanoporous Materials

Villarroel-Rocha

Barrera

Blanco

et al. 2013

Adsorption Science & Technology

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“…This is most likely caused by a very low or very high-mass ratio of silica to surfactant in these two samples. The formation of the -Si-O-Si-network and the -Si-OH group can be hampered by a silica/surfactant ratio that is either too small or too large [39]. On the other hand, the samples of SBA-15 (6 g, 60 min), SBA-15 (8 g, 60 min), and SBA-…”

Section: Ftir Spectra Analysismentioning

confidence: 99%

“…[38], giving large opportunity to use the rice husk ash as the source of silica in the synthesis of SBA-15. According to Barrera et al [39], the silica/surfactant ratio has a significant impact on the mechanism of mesoporous development in the synthesis of SBA-15. Other report suggests that a low silica/surfactant ratio causes the mesoporous material to be difficult to create, but a high ratio causes the structure's regularity to be compromised [40].…”

Section: ■ Introductionmentioning

confidence: 99%

Optimizing Rice Husk Silica Mass and Sonication Time for a More Efficient and Environmentally Friendly Synthesis of SBA-15

Suyanta

Mudasir²

2022

Indones. J. Chem.

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By optimizing rice husk silica mass and sonication time, SBA-15 was successfully synthesized in a more efficient and environmentally friendly way. The solution of Pluronic P-123 was mixed with the solution containing NaOH and various masses of rice husk silica (4–12 g), followed by sonication for a certain time (30–150 min). The mixture was filtered and washed with distilled water and ethanol until neutral, then dried at 110 °C for 2 h and calcined at 500 °C for 6 h. The results showed that the optimal mass of rice husk silica was 8 g, while the optimal sonication time was 30 min. The product has a cylindrical pore shape with good crystallinity and pore structure regularity. The specific surface area (SBET), the pore diameter (DBJH), the specific pore volume (VBJH), and the wall thickness (WT) of the product were 601 m2 g–1, 4.76 nm, 0.88 mL g–1, and 5.02 nm, respectively. These results are not considerably different from the porosity of SBA-15, synthesized previously using conventional hydrothermal techniques from various silica sources. In addition, it is also comparable to the porosity of SBA-15 produced from TEOS by sonochemical methods as well as with commercial SBA-15.

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“…MCM-41-Fe2O3 was synthesized by direct-synthesis method at room temperature without hydrothermal treatment according to a modification of the procedure reported by Barrera et al (2011) [27]. The reagents used were CTAB (cetyltrimethylammonium bromide, C16H33N(CH3)3Br) as the surfactant, TEOS (Tetraethyl orthosilicate, SiC8H20O4) as the silica ACCEPTED MANUSCRIPT…”

Section: Synthesis and Functionalization Of Amino Mcm-41-fe2o3mentioning

confidence: 99%

Mesoporous immunosensor applied to zearalenone determination in Amaranthus cruentus seeds

Regiart

Fernández

Vicario

et al. 2018

Microchemical Journal

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We describe an electrochemical immunosensor for zearalenone (ZEA) determination in Amaranthus cruentus seeds by an enzyme immunoassay sandwich type. The device is based on a screen-printed carbon electrode (SPCE) modified with amino mesoporous silica (MCM-41) synthetized with Fe2O3 in situ. Mesoporous material enlarges the surface available for anti-ZEA antibodies immobilization. SPCE/MCM-41-Fe2O3 was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and cyclic voltammetry.ZEA in the sample previously pretreated was recognized and captured by anti-ZEA on SPCE/MCM-41-Fe2O3. Then, the horseradish peroxidase (HRP)-conjugated anti-ZEAantibody was added, and the substrate solution (H2O2 + 4-terbutylcatechol (4-TBC)) reacted with the HRP that catalyzed the oxidation of 4-TBC to 4-terbutylbenzoquinone (TBQ).Finally, the enzymatic product was detected at _ 100 mV, and the current was proportional to the ZEA present in the sample.The calibration plot exhibited a linear range from 1.88 to 45 ng mL -1 , and the limit of detection was 0.57 ng mL -1 (r 2 = 0.998). The coefficient of variation inter-and intra assay was below 6%. Our method achieved a good selectivity, stability and reproducibility for ZEA detection in A. cruentus seeds.

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Non-Hydrothermal Synthesis of Cylindrical Mesoporous Materials: Influence of the Surfactant/Silica Molar Ratio

Cited by 25 publications

References 48 publications

Importance of the α_s-plot Method in the Characterization of Nanoporous Materials

Importance of the α_s-plot Method in the Characterization of Nanoporous Materials

Optimizing Rice Husk Silica Mass and Sonication Time for a More Efficient and Environmentally Friendly Synthesis of SBA-15

Mesoporous immunosensor applied to zearalenone determination in Amaranthus cruentus seeds

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Non-Hydrothermal Synthesis of Cylindrical Mesoporous Materials: Influence of the Surfactant/Silica Molar Ratio

Cited by 25 publications

References 48 publications

Importance of the αs-plot Method in the Characterization of Nanoporous Materials

Importance of the αs-plot Method in the Characterization of Nanoporous Materials

Optimizing Rice Husk Silica Mass and Sonication Time for a More Efficient and Environmentally Friendly Synthesis of SBA-15

Mesoporous immunosensor applied to zearalenone determination in Amaranthus cruentus seeds

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Importance of the α_s-plot Method in the Characterization of Nanoporous Materials

Importance of the α_s-plot Method in the Characterization of Nanoporous Materials