Development of iron modified MCM-41 as promising nano-composites with specific magnetic behavior

Cuello, Natalia Inés; Elías, Verónica Rita; Torres, C.E. Rodrı́guez; Crivello, Mónica E.; Oliva, Marcos Iván; Eimer, Griselda A.

doi:10.1016/j.micromeso.2014.10.005

Cited by 49 publications

(31 citation statements)

References 55 publications

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“…1a). These results confirmed the retention of MCM-41 structure even after the introduction of tin species by hydrothermal method [32]. Figure 1b shows the XRD patterns of siliceous SBA-15 and Sn/SBA-15 with different tin contents synthesized by conventional hydrothermal method.…”

Section: Reaction Conditionssupporting

confidence: 68%

Hydrothermal synthesis of tin containing mesoporous silicas and their catalytic performance over Baeyer–Villiger oxidation of cyclohexanone to ε-caprolactone: comparison of Sn/MCM-41 and Sn/SBA-15

Tian

Wang

et al. 2015

J Porous Mater

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In this work, a series of tin containing mesoporous silicas (Sn/MCM-41 and Sn/SBA-15) were prepared by a one-pot hydrothermal method and their physical and chemical properties were characterized by various techniques such as powder X-ray diffraction, nitrogen adsorption-desorption and transmission electron microscopy. Among these catalysts, Sn/SBA-15(50) exhibited the highest catalytic activity for Baeyer-Villiger oxidation of cyclohexanone to e-crolactone using hydrogen peroxide (H 2 O 2 ) as the green oxidant. The best methodology was to carry out the reaction in 1,4-dioxane under 10 wt% Sn/ SBA-15 catalyst of 0.1 mol cyclohexanone at 70°C for 4 h, and a molar ratio cyclohexanone: oxidant of 1:3. Furthermore, this heterogeneous mesoporous Sn/SBA-15 catalyst was reusable without any appreciable loss in activity and selectivity after three cycles.

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Section: Reaction Conditionssupporting

confidence: 68%

Hydrothermal synthesis of tin containing mesoporous silicas and their catalytic performance over Baeyer–Villiger oxidation of cyclohexanone to ε-caprolactone: comparison of Sn/MCM-41 and Sn/SBA-15

Tian

Wang

et al. 2015

J Porous Mater

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“…Cuello et al [25] reported that the first band could be associated to the iron atoms link to surface O atoms or host as isolated iron cations, the second band was attributed to the small oligonuclear iron oxide clusters (FeO) n whereas the third maximum at about 545 nm could be related to the larger iron oxide particle.…”

Section: Uv-vis Drs Studiesmentioning

confidence: 99%

Synthesis, characteristics and sonocatalytic activities of calcined γ-Fe2O3 and TiO2 nanotubes/γ-Fe2O3 magnetic catalysts in the degradation of Orange G

Pang

Lim

Ong

et al. 2016

Ultrasonics Sonochemistry

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In this work, γ-Fe2O3 and TiO2 NTs/γ-Fe2O3 composites with good magnetism and sonocatalytic activity were prepared by a facile polyol method and utilize the principle of isoelectric point method, respectively. The structural and magnetic features of the prepared calcined γ-Fe2O3 and composite catalysts were investigated by transmission electron microscopy (TEM), powder X-ray diffraction (XRD), surface analysis, UV-Vis diffuse reflectance spectra (UV-Vis DRS), vibrating sample magnetometry (VSM) and zeta potential analysis. The effects of calcination temperature on γ-Fe2O3 phase variation, physical properties and sonocatalytic properties were investigated. The porosity, specific surface area, band gap energy and sonocatalytic activity of γ-Fe2O3 were gradually decreased with calcination temperature increased. TiO2 NTs/γ-Fe2O3 with appropriate composition and specific structural features possess synergetic effects such as efficient separation of charge carriers and hydroxyl radicals produced by heterogeneous fenton and fenton-like reactions. This enhanced the sonocatalytic activity for the degradation of Orange G under ultrasonic irradiation. The sonocatalytic reactions obeyed pseudo first-order kinetics. All these information provide insight into the design and development of high-efficiency catalyst for wastewater treatment.

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“…Se pueden observar tres bandas a 220-250, 300-380 and 450-550 nm aproximadamente. El primer máximo a alrededor de 254 nm indica que los átomos de hierro pueden unirse a los átomos de O de la superficie (Cuello et al 2015, Benzaquén et al 2017. Mientras que el segundo máximo a aproximadamente 340 nm puede atribuirse a grupos de óxido de hierro (FeO) n o nanopartículas de muy pequeño tamaño (Cuello et al 2015).…”

Section: Caracterización De Los Materialesunclassified

“…El primer máximo a alrededor de 254 nm indica que los átomos de hierro pueden unirse a los átomos de O de la superficie (Cuello et al 2015, Benzaquén et al 2017. Mientras que el segundo máximo a aproximadamente 340 nm puede atribuirse a grupos de óxido de hierro (FeO) n o nanopartículas de muy pequeño tamaño (Cuello et al 2015). Por último, el tercer máximo a aproximadamente 500 nm puede asignarse a nanopartículas de óxido de hierro de mayor tamaño (Liu et al 2004).…”

Section: Caracterización De Los Materialesunclassified

Utilización de cáscara de arroz como fuente de sílice para la síntesis de materiales mesoporosos y su aplicación en la degradación de diferentes compuestos orgánicos

Benzaquén

Carraro

Eimer

2020

RTyC

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ResumenEn el presente trabajo se sintetizaron materiales mesoporosos del tipo MCM-41 utilizando cáscara de arroz como precursor de sílice. En una primera etapa, se evaluaron dos lavados previos de la cáscara de arroz, con agua y ácido nítrico, obteniéndose sílice de alta área superficial para el lavado con ácido. El material mesoporoso silíceo se sintetizó mediante licencia de Creative Commons -Reconocimiento-NoComercial 4.0 Internacional (1-10) Revista Tecnología y Ciencia Tamara B. Benzaquén, et al.el método de tratamiento hidrotérmico utilizando el silicato extraído de la cáscara como precursor de sílice y bromuro de cetiltrimetilamonio (CTAB) como plantilla. El soporte MCM-41 luego fue modificado con Fe por el método de impregnación húmeda para su utilización como catalizadores heterogéneos, en la degradación de diferentes compuestos orgánicos en medio acuoso, como herbicidas (atrazina), compuestos derivados de la industria del plástico (bisfenol A) y de la industria farmacéutica (paracetamol), aplicando la reacción foto-Fenton heterogénea (metal/H 2 O 2 /Radiación); y así alcanzar un sistema catalítico de mayor eficiencia. AbstractIn the present work, MCM-41-type mesoporous materials were synthesized using rice husk as precursor of silica. In a first stage, two previous washes of the rice husk were evaluated with water and nitric acid, obtaining silica with a high surface area for washing with acid. The siliceous mesoporous material was synthesized by the hydrothermal treatment method using the silicate supernatant extracted from RHA as silica precursor and cetyltrimethylammonium bromide (CTAB) as template. The MCM-41 support was then modified with Fe by the wet impregnation method for its use as heterogeneous catalysts, in the degradation of different organic compounds in aqueous medium, as herbicides (atrazine), compounds derived from the plastic industry (bisphenol A) and the pharmaceutical industry (paracetamol), applying the photo-Fenton heterogeneous reaction (metal/H 2 O 2 /Radiation); and thus achieve a catalytic system of greater efficiency.

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Development of iron modified MCM-41 as promising nano-composites with specific magnetic behavior

Cited by 49 publications

References 55 publications

Hydrothermal synthesis of tin containing mesoporous silicas and their catalytic performance over Baeyer–Villiger oxidation of cyclohexanone to ε-caprolactone: comparison of Sn/MCM-41 and Sn/SBA-15

Hydrothermal synthesis of tin containing mesoporous silicas and their catalytic performance over Baeyer–Villiger oxidation of cyclohexanone to ε-caprolactone: comparison of Sn/MCM-41 and Sn/SBA-15

Synthesis, characteristics and sonocatalytic activities of calcined γ-Fe2O3 and TiO2 nanotubes/γ-Fe2O3 magnetic catalysts in the degradation of Orange G

Utilización de cáscara de arroz como fuente de sílice para la síntesis de materiales mesoporosos y su aplicación en la degradación de diferentes compuestos orgánicos

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