Síntese da zeólita A utilizando diatomita como fonte de sílicio e alumínio

Nascimento, Christine Rabello; Sobrinho, E. M. O.; Assis, Raimison Bezerra de; Fagundes, R. F.; Bieseki, Lindiane; Pergher, Sibele B. C.

doi:10.1590/s0366-69132014000100009

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…Also, a small amorphous halo was found for the Diato_RN sample probably related to unreacted diatomite. Then, we were able to obtain LTA topology (without quartz nor other zeolitic phases) with Diato_RN, without needing to adjust the Si/Al gel ratio with other raw sources, in contrast with the existing literature on LTA zeolite with alternative raw materials [18,25]. Besides, we remark that neither diatomites nor perlite were pre-treated in this synthesis, being an advantage to the use of kaolinite or rice husk [26,27].…”

Section: Resultsmentioning

confidence: 85%

“…They were already reported as alternative silica sources for the LTA zeolite synthesis. However, they needed calcination pretreatments or had long synthesis times (even with a previous ageing step), or the crystallinity was too low, or the products were mixed with other phases in significant proportions [17][18][19][20]. For these reasons, it is interesting to continue studying these materials as alternative sources for zeolite synthesis gels.…”

Section: Introductionmentioning

confidence: 99%

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LTA zeolite synthesis using natural materials and its evaluation by Green Star methodology

et al. 2020

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The industrial costs of zeolite synthesis can be diminished by the substitution of traditional raw materials by natural sources. In this work, we obtained LTA zeolite from four natural materials, three different diatomites and expanded perlite, and characterize them by X-ray diffraction, X-ray fluorescence and scanning electron microscopy. It was possible to observe the formation of the zeolitic materials through the identification of the Bragg reflections and the cubic morphology characteristic of the aluminosilicate. The Si/Al ratio of the samples resulted next to the unit as expected for this topology. We found small differences between the zeolitic products, remarking the possibility of adapting this process using natural materials to industry. These results were used for the Green Star evaluation, calculating the synthesis degree of greenness, resulting greener due to the complete substitution of the traditional silica source.

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

LTA zeolite synthesis using natural materials and its evaluation by Green Star methodology

et al. 2020

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“…This occurs because the lamella dimensions are larger than the relative size of the nitrogen molecule [ 25 , 26 ]. The zeolite A isotherm shown in Figure 4 is classified as being type I, presenting a low specific area due to the size of its micropores [ 27 ]. In Figure 4 , the composite isotherm is type IV, which is characteristic of porous and lamellar materials.…”

Section: Resultsmentioning

confidence: 99%

Development of a Zeolite A/LDH Composite for Simultaneous Cation and Anion Removal

Bezerra

Bieseki²,

Silva

et al. 2019

Materials

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Wastewater from the oil industry is a major problem for aqueous environments due to its complexity and estimated volume of approximately 250 million barrels per day. The combination of these petroleum pollutants creates risks to human health, and their removal from the environment is considered a major problem in the world today. Thus, this work has the objective of studying the treatment of this type of effluent through the adsorption method using the following exchange materials: cationic, anionic, their combination by a sequential method, and a composite material. Zeolite A, a layered double hydroxide (LDH), and the new composite material formed by zeolite A and LDH structures were synthesized for this study. All were used for the simultaneous treatment of cations and anions in a complex sample such as water produced from petroleum production. The composite demonstrated an excellent ability to simultaneously remove cations and anions. The results obtained after the different treatment modes of the effluent using different materials varied from 85% to 100% for the removal of cations and from 56% to 99.7% for the removal of anions.

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“…Os picos de quartzo e mulita estavam presentes na cinza sem tratamento e permaneceram presentes nas amostras após a síntese. Segundo [20], a presença significativa desses compostos torna a dissolução do material mais difícil o que reduz o rendimento de síntese para obtenção de zeólita. Para …”

Section: Resultsunclassified

Formação de sodalita e cancrinita a partir de cinzas volantes: análise por Rietveld e química racional

et al. 2017

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ResumoZeólitas são sólidos porosos compostos majoritariamente por alumínio e silício sob a forma de aluminossilicatos cristalinos hidratados. Estes materiais possuem propriedades particulares inerentes às suas características estruturais que os tornam úteis em diversas aplicações industriais. A síntese de zeólitas a partir de resíduos e fontes naturais de silício e alumínio tem se destacado devido aos benefícios ambientais e econômicos. Neste trabalho, cinzas volantes provenientes de termoelétricas foram convertidas em zeólitas através da ativação alcalina com hidróxido de sódio (NaOH). Esta técnica caracteriza-se pelo baixo custo e por se tratar de alternativa tecnológica com grande agregação de valor por transformar materiais existentes em larga escala em um material de grande aplicação tecnológica. Objetivou-se estudar a síntese de zeólitas do tipo sodalita e cancrinita a partir de cinzas volantes através da quantificação de fases e análise química racional de forma a evidenciar a influência das condições de processo. As amostras foram caracterizadas por meio das técnicas de difração de raios X com quantificação de fases a partir do método de Rietveld, fluorescência de raios X com realização ainda de análise racional de fases cristalinas e microscopia eletrônica de varredura. Foram obtidas zeólitas do tipo sodalita e cancrinita a partir da transformação de cinza volante, por síntese com concentrações de 3,5, 5,25 e 7,0 M NaOH por 24, 36 e 48 h. Palavras-chave: cinza volante, síntese de zeólitas, sodalita, cancrinita, fases cristalinas. 3.5, 5.25 and 7.0 M NaOH for 24, 36 and 48 h. Abstract Zeolites are porous solids composed mainly of aluminum and silicon in the form of hydrated crystalline aluminosilicates; they have special properties inherent to their structural characteristics that make them useful in many industrial applications. The synthesis of zeolites from natural and residual sources of silicon and aluminum has become more important due to both environmental and economic benefits. In this work fly ash from power plants were converted to zeolite by alkaline activation with sodium hydroxide (NaOH

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Síntese da zeólita A utilizando diatomita como fonte de sílicio e alumínio

Cited by 14 publications

References 10 publications

LTA zeolite synthesis using natural materials and its evaluation by Green Star methodology

LTA zeolite synthesis using natural materials and its evaluation by Green Star methodology

Development of a Zeolite A/LDH Composite for Simultaneous Cation and Anion Removal

Formação de sodalita e cancrinita a partir de cinzas volantes: análise por Rietveld e química racional

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