Preparation and characterization of highly pure silica from sedge as agricultural waste and its utilization in the synthesis of mesoporous silica MCM-41

Ghorbani, Farshid; Younesi, Habibollah; Mehraban, Zahra; Çelik, M.S.; Ghoreyshi, Ali Asghar; Anbia, Mansoor

doi:10.1016/j.jtice.2013.01.019

Cited by 103 publications

(40 citation statements)

References 36 publications

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“…Após a decomposição do surfactante, verifica-se a terceira perda de massa de 4,0%, resultante da condensação dos grupos silanóis da superfície interna dos poros que interagiam com as moléculas do direcionador. Estes resultados estão de acordo com a literatura (Park et al, 2007;Ghorbani et al, 2013;Nascimento et al, 2014).…”

Section: Caracterização Da Peneira Molecular Mesoporosa Ce-mcm-41unclassified

Incorporação De Cério À Peneira Molecular Mesoporosa (Mcm-41)

Nascimento¹,

Duarte²,

Barbosa³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -A síntese e caracterização da peneira molecular mesoporosa MCM-41 vêm sendo amplamente estudadas devido a sua elevada área superficial e volume de poros de grandes dimensões, visando sua potencial aplicação em processos de adsorção, separação e catálise. Neste estudo, a peneira molecular mesoporosa com incorporação do metal de transição Cério (Ce-MCM-41) foi sintetizada pelo método hidrotérmico. A composição molar do gel obtido foi de 1 CTMABr: 4 SiO 2 : 1 Na 2 O: 0,2 Ce 2 O 3 : 200 H 2 O. A caracterização do material foi realizada por TG, DRX, BET e FT-IR. O material apresentou boa organização estrutural e morfológica segundo as analises de DRX e BET. Os espectros de FT-IR apresentaram bandas na região de 400 a 4000 cm -1 e juntamente com a análise de TG revelaram que a remoção do direcionador estrutural foi efetiva. Diante do exposto, a incorporação do metal cério não afetou a estrutura da MCM-41 e o método de síntese empregado foi eficiente uma vez que houve formação de material mesoporoso.

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Section: Caracterização Da Peneira Molecular Mesoporosa Ce-mcm-41unclassified

Incorporação De Cério À Peneira Molecular Mesoporosa (Mcm-41)

Nascimento¹,

Duarte²,

Barbosa³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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“…Silica is the second most abundant element in the earth surface, which accounts for approximately 32% of the total weight of it. As a consequence, plants rooting in soil always contain some silicon in their tissues [3][4]. The nature of herbal amorphous silica (plants with high content of silica), makes it extractable at lower temperature, and hence provides a low energy method as an alternative to the current high energy methods of silica extraction.…”

Section: Introduction (Heading 1)mentioning

confidence: 99%

“…Some of the herbal silica source is either an agricultural waste or industrial byproduct. For example, the annual yield of rice husks and straws was about 127 million tons in 2008 [4].…”

Section: Introduction (Heading 1)mentioning

confidence: 99%

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Synthesis and characterization of silica prepared by thermal method

Geyikçi¹

2016

Fourth International Conference on Advances in Bio-Informatics and Environmental Engineering - ICABEE 2016

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Abstract-Silica is a basic raw material that is widely used in many industrially important products such as electronics, ceramic, pharmaceutics, detergents, adhesives and polymer materials. The sources such as rice husk, groundnut shell, almond shell, bamboo leaves and sugarcane bagasse are considered as a waste material. These waste materials in large quantities can create a serious environmental problem. At harvesting time, these waste materials are burnt to release nutrients for the next growing season and to get rid of the huge quantity of it. During burning, carbon, oxygen and hydrogen elements which are present in these waste materials are converted into flammable gases such as carbon monoxide, hydrogen, methane and ash. Combustion of the almond shell produces almond shell ash, which consists of mainly silica and carbon. In this study, almond shells are subjected to moisture removal in a hot plate and sintered 450 O C, 700 O C and 900 O C by thermal methods for 10, 8 and 7 h, respectively. The sintered powder was treated with 1 M NaOH to form sodium silicate. In a systematic study, results demonstrated that almond shell produced amorphous silica (SiO 2 ). The prepared silica was characterized by FT-IR, XRD and SEM analysis. FT-IR results showed a good peak correlation between the commercial silica and burnt almond shell residue.

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“…A wide variety of reports has addressed the versatility of MCM-41 [12][13][14][15][16] which became the most popular example of the M41S family due to a combination of superior properties, such as high surface area, thermal stability and porous volume that can vary according to the surfactant used. In addition, average pore sizes can vary between 2 and 50 nm 17,18 . These features yield fast mass transport 19 , making this material appealing to adsorption processes 9 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis Optimization of MCM-41 for CO2 Adsorption Using Simplex-centroid Design

et al. 2015

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There is a growing concern on the relationship between anthropogenic carbon dioxide and climate changes. A promising approach is the adsorption technology using mesoporous MCM-41 materials that can be easily synthesized to depict structures adequate to the flow of gas. The aim of this study was to improve the synthesis of MCM-41 using cationic surfactant mixtures and apply the resulting materials to CO 2 adsorption. To that end, the simplex-centroid design was applied to optimize CO 2 adsorption from seven mesoporous MCM-41 materials synthesized by the hydrothermal method using surfactants from hydrophobic chains of different sizes. The cationic surfactants used were tetradecyltrimetylammonium bromide, cetyltrimethylammonium bromide, trimethyloctadecylammonium bromide and their mixture at ratios of 1:1 and 1:1:1. The CO 2 adsorption was investigated using thegravimetric method at 298 K and pressures up to 40 bar. The resulting materials, labelled C 17 , C 19 , C 21 , C 17 C 19 , C 19 C 21 , C 17 C 21 and C 17 C 19 C 21 , were characterized by XRD, FTIR, TG and SEM and showed significant differences in structure as well as in the mass of CO 2 adsorption. The response models showed that the best combination of the surfactants resulted from C 17 C 19 sample, which presented synergistic interactions reaching the highest value of CO 2 adsorption (0.62 g CO 2 /g adsorbent), compared to other samples.

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Preparation and characterization of highly pure silica from sedge as agricultural waste and its utilization in the synthesis of mesoporous silica MCM-41

Cited by 103 publications

References 36 publications

Incorporação De Cério À Peneira Molecular Mesoporosa (Mcm-41)

Incorporação De Cério À Peneira Molecular Mesoporosa (Mcm-41)

Synthesis and characterization of silica prepared by thermal method

Synthesis Optimization of MCM-41 for CO2 Adsorption Using Simplex-centroid Design

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