Synthesis and characterization of mesoporous silica-coated magnetite containing cetyltrimethylammonium bromide and evaluation on the adsorption of sodium dodecylbenzenesulfonate

Dorigon, Larissa Piffer; Frota, Juan Pablo Ruiz de Almeida da; Kreutz, Juliana Cristina; Giona, Renata Mello; Moisés, Murilo Pereira; Bail, Alesandro

doi:10.1016/j.apsusc.2017.05.249

Cited by 26 publications

(12 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To utilize the catalytic/surface properties of the ferrite NP core, the shell has to be porous to allow the transport of reagents to the ferritic NP core. In some cases the pores could be tailored allowing only the right reactant to reach the catalytically active surface [61][62][63][64][65]. However those particles could still be magnetic, being problematic in heterogeneous catalysis and the ferritic part/core of the particle is still unstable in acidic media.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Timm

Bloesser

Zhang

et al. 2020

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

The unique combination of two functional materials, namely the earth-abundant spinel magnesioferrite (MgFe 2 O 4) and mesoporous phenylene-bridged KIT-6-type organosilica, was developed. The mesoporous organosilica acts as host matrix for the nanosized MgFe 2 O 4 particles which leads to better dispersibility and increased stability towards acids. Additionally, the mesoporous host is a very good material to generate a toolbox towards applicable materials due to flexible functionalization. Nanosized, monodisperse MgFe 2 O 4 crystallites were synthesized via a facile microwave assisted non-aqueous reaction path. Afterwards, the particles were embedded in phenylene-bridged periodic mesoporous organosilica with 3D cubic pore arrangement (KIT-6-type PMO) generating a new kind of mesoporous inorganic-organic hybrid material (MgFe 2 O 4 @phe-PMO). The MgFe 2 O 4 @phe-PMO exhibits the characteristics of both components: A high specific surface area of 1164 m 2 g-1 with clearly defined and highly ordered micro-and mesopores (1.5 and 6.8 nm), and the broad absorption of visible and UV light due to the phenylene bridging units in the PMO and the MgFe 2 O 4 particles. The presence of MgFe 2 O 4 nanoparticles in the PMO matrix is proven by UV/Vis spectroscopy, powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM). Selected area electron diffraction (SAED) and Scanning TEM in atomic resolution was chosen to demonstrate the crystallinity and phase purity of MgFe 2 O 4 particles in the hybrid material. An additional focus was laid on calcination of the MgFe 2 O 4 /PMO hybrids to remove template molecules, while preventing rearrangement or shrinkage of the pore system and to promote further crystallization of the MgFe 2 O 4 nanoparticles.

show abstract

Section: Introductionmentioning

confidence: 99%

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Timm

Bloesser

Zhang

et al. 2020

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

show abstract

“…Water treatment technology for phenol degradation is needed to preserve the water quality for human survival and health. Dorigon et al [2] synthesized mesoporous magnetite-silica-cetyltrimethylammonium bromide (MS-CTAB) for adsorption of dodecylbenzene sulfonate, whereas Ingole et al [3] used carbon banana peels for adsorption of phenol. Thus, in this study, we synthesized CTA-silica magnetite for use in phenol adsorption.…”

Section: Introductionmentioning

confidence: 99%

Preparation of magnetite-silica–cetyltrimethylammonium for phenol removal based on adsolubilization

et al. 2020

View full text Add to dashboard Cite

AbstractIn this study, we successfully coated cetyltrimethylammonium–silica on magnetite. The material produced is used to degrade phenol waste in the waters. The effect of the addition of cetyltrimethylammonium bromide (CTAB) on the ability of phenol adsorption was assessed through changes in CTAB concentration of 1, 5, and 10 mM. The results of Fourier-transform infrared spectroscopy explain that CTAB has electrostatic interactions with the silica surface, which is induced by opposite-loaded patches on the opposite surface of silica oxide. The results of the vibrating sample magnetometer show that the magnetite that has been coated by silica–CTA has magnetic properties that are weaker than the initial magnetite, which indicates that the silica–CTA layer has blocked the magnetite. Based on the measurement of the gas sorption analyzer, the largest pore size is in the micro-mesh region, which is between 2 and 6 nm. All magnetite-silica–cetyltrimethylammonium (MS–CTA) showed good adsorption ability of phenol and correlated with the amount of loaded CTAB and admicelle density of the adsorbent. The amount of phenol adsorbed increases proportionately with the increasing density of CTAB admicelles. The maximum phenol adsorption capacity (0.93 mg g−1 adsorbent) is achieved by MS–CTA prepared at a CTAB concentration of 10 mM.

show abstract

“…Valores de pontos de carga zero encontrados na literatura para xerogéis de sílica variaram entre 2,0 e 4,6 (Cloarec et al, 2016;Dorigon et al, 2017;Hannachi & Hafidh, 2020;Wu et al, 2004), o que significa que para qualquer pH abaixo disto, as cargas na superfície da mesma serão positivas. Em contrapartida, em meio básico as cargas superficiais dos xerogéis de sílica estão negativas e o corante AM totalmente deprotononado, o que favoreceu, portanto, a maior adsorção do mesmo nos sítios ativos.…”

Section: Resultsunclassified

“…Três valores de pH foram testados: 3,0, 6,0 e 9,0. Estes valores foram escolhidos, pois valores de pH superiores a 9,0 provocam a instabilidade do AM (Adamčíková et al, 2000;Mills et al, 2011) e, além disso, valores intermediários àqueles testados não trariam melhores resultados, pois o ponto isoelétrico de materiais de sílica varia entre 2,0 e 4,6 (Cloarec et al, 2016;Dorigon et al, 2017;Hannachi & Hafidh, 2020;Wu et al, 2004). O erlenmeyer permaneceu em agitação por 1 hora em uma mesa agitadora orbital da Tecnal a 120 rotações por minuto (rpm).…”

Section: Fonte: Autoresunclassified

Influência da catálise ácida e básica na síntese de xerogéis de sílica para a adsorção de azul de metileno em meio aquoso

Olívio

Buzato

Souza

2021

RSD

View full text Add to dashboard Cite

Neste trabalho, dois xerogéis de sílica foram preparados pelo processo sol-gel usando uma solução aquosa ácida e uma solução aquosa básica como catalisadores para cada material, nomeados como SiO2-A e SiO2-B, respectivamente. Corantes, como o azul de metileno (AM), são contaminantes comuns presentes em águas residuais de indústrias têxteis e a busca ou aperfeiçoamento de processos capazes de reduzir esses danos via retenção destes poluentes, é de extrema importância. Esses xerogéis foram usados como adsorventes para a remoção de AM de soluções aquosas. Espectroscopia de absorção nas regiões do Ultra-Violeta e do visível foi usada para monitorar o processo de adsorção. A porosidade e a morfologia destes xerogéis foram estudadas usando isotermas de adsorção e de dessorção de N2 e Microscopia Eletrônica de Varredura (MEV), respectivamente. Os dados experimentais mostraram que a adsorção de AM é maior em pH 9,0, para ambos os xerogéis, com uma alta performance para o xerogel SiO2-B. Estes resultados foram melhor ajustados ao modelo da isoterma de Langmuir, atingindo valores de massa máxima de adsorção de 50,6 mg g-1 e 8,24 mg g-1 de AM para SiO2-B e SiO2-A, respectivamente. As imagens de MEV mostraram que o xerogel SiO2-A possui uma superfície lisa, enquanto que SiO2-B tem uma morfologia rugosa e com aglomerados. Os dados de porosidade mostraram que esses xerogéis são mesoporosos. Nossos experimentos demonstraram que os xerogéis SiO2-A e SiO2-B poderiam ser usados em aplicações ambientais para a remoção de poluentes da água tais como corantes.

show abstract

Synthesis and characterization of mesoporous silica-coated magnetite containing cetyltrimethylammonium bromide and evaluation on the adsorption of sodium dodecylbenzenesulfonate

Cited by 26 publications

References 43 publications

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Preparation of magnetite-silica–cetyltrimethylammonium for phenol removal based on adsolubilization

Influência da catálise ácida e básica na síntese de xerogéis de sílica para a adsorção de azul de metileno em meio aquoso

Contact Info

Product

Resources

About