Synthesis of Zeolite A employing Amazon kaolin waste

Filho, Severino H. da Silva; Bieseki, Lindiane; Silva, A. R. da; Maia, Anabela; Gil, Rosane A. S. San; Pergher, Sibele B. C.

doi:10.1590/0366-69132015613601898

Cited by 14 publications

(4 citation statements)

References 11 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Kaolin is a clay predominantly composed by kaolinite (Al 2 Si 2 O 5 (OH) 4 ) 25 , which has been widely used in a variety of technological applications [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] . Due to the low-cost and large availability, the use of clays like kaolin becomes the adsorption process an attractive and promising technology.…”

Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

View full text Add to dashboard Cite

This study investigated the potential of Brazilian kaolin as a low-cost adsorbent for the removal of Malachite Green (MG) from colored effluents. The morphology, chemical structure and surface properties of the adsorbent were investigated by characterization techniques such as X-ray diffraction, N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy, X-ray fluorescence spectrometry, scanning electron microscopy, thermogravimetric analysis and particle size distribution. A possible technological application of raw kaolin is the MG removal from aqueous media, which was investigated using batch adsorption experiments. The adsorption kinetics was studied using the pseudo-first order, pseudo-second order and Elovich models. The adsorption isotherms were studied using the Langmuir, Freundlich and Sips models. The Elovich model was the more adequate to represent the adsorption kinetic, while the equilibrium was well represented by the Langmuir model. The maximum adsorption capacity, at pH of 6.3 and temperature of 25ºC, was 128 mg g -1 , and this satisfactory result may be associated with some adsorbent properties. Therefore, the results revealed that raw kaolin can be utilized as a promising low-cost adsorbent to remove MG from colored effluents.

show abstract

Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Assim, a problemática maior desse processo é a construção das lagoas de sedimentação, já que as mesmas ocupam grandes áreas, além dos custos elevados para sua construção e manutenção. No entanto, esse resíduo, devido à sua composição mineralógica, tem sido usado como material de partida na síntese de zeólitas, como as fases A de Na, K, Ca e Mg [1][2][3][4][5], sodalita [6,7], tipo faujasita [8], fase P de Na [9] e analcima [10]. Zeólitas podem ser definidas como aluminossilicatos hidratados, do grupo dos metais alcalinos e alcalinos terrosos, com arranjo estrutural que apresenta cavidades e canais interconectados, com a presença de íons de compensação, como Na + , Ca 2+ , Mg 2+ e K + , e moléculas de H 2 O [11].…”

Section: Introductionunclassified

Efeito do envelhecimento da mistura reacional constituída por resíduo de caulim da Amazônia na síntese da zeólita faujasita

et al. 2017

View full text Add to dashboard Cite

ResumoA etapa de pré-cristalização (envelhecimento) foi introduzida no processo de síntese da zeólita tipo faujasita. Nessa síntese, um resíduo caulinítico proveniente da região amazônica foi utilizado como fonte de Si e Al, já que o mesmo foi constituído principalmente por caulinita. O processo de síntese ocorreu em três etapas: 1) tratamento térmico do resíduo de caulim a 700 °C/2 h; 2) pré-cristalização da mistura reacional por 24 h à temperatura ambiente; e 3) processo hidrotermal a 90 °C por 1 a 10 h. A caracterização do material de partida, material pré-cristalizado e produtos de síntese foi feita por meio de difratometria de raios X, microscopia eletrônica de varredura e análise química. Os resultados confirmaram que o resíduo de caulim foi constituído principalmente por caulinita, o material obtido por meio da pré-cristalização foi amorfo e a formação da zeólita faujasita iniciou-se a partir de 5 h de síntese. A partir do tempo de 8 h de cristalização, a zeólita faujasita apresentou maior grau de ordem estrutural, porém zeólita P também foi formada. Palavras-chave: resíduo caulinítico, pré-cristalização, zeólita faujasita. AbstractThe pre-crystallization step (aging) was introduced in the faujasite synthesis process. In this synthesis, the kaolin waste from the Amazon region was used as Al and Si source, since it was composed primarily of kaolinite. The synthesis process followed three steps: 1) thermal treatment of kaolin waste at 700 °C/2 h; 2) pre-crystallization of reaction mixture for 24 h at room temperature; and (3) hydrothermal process at 90 °C for 1 to 10 h. The starting material, pre-crystallized material and synthesized products were characterized by X-ray diffraction, scanning electron microscopy and chemical analysis. The results confirmed that kaolin waste was composed primarily of kaolinite, the material obtained by pre-crystallization was amorphous, and the zeolite faujasite formation started at 5 h of synthesis. Zeolite faujasite had high structural order from the synthesis time of 8 h, however zeolite P was also formed.

show abstract

“…Zeolite was synthesized from a waste material obtained from kaolin production, according to the methodology reported in previous works [46,47].…”

Section: Catalysts Preparationmentioning

confidence: 99%

Renewable Diesel Production from Palm Fatty Acids Distillate (PFAD) via Deoxygenation Reactions

et al. 2021

View full text Add to dashboard Cite

The reactions to produce liquid biofuels from a palm fatty acid distillate (PFAD) under hydrogen absence were carried out using 10 wt% NiO/zeolite (Ni/Zeo), 10 wt% Co3O4/zeolite (Co/Zeo), and 10 wt% (NiO + Co3O4)/zeolite (NiCo/Zeo) as catalysts. The zeolite was synthesized by a thermal and chemical treatment from natural clay, obtaining a zeolite A and sodalite mixture. Catalytic activity was evaluated as a function of reaction temperature (250, 300, and 350 °C) during 0.5 h and using 5 wt% of catalyst. The reaction products were classified as organic liquid products (OLPs), gaseous products, and solid waste. The OLPs fractions were separated by fractional distillation, and the products were identified and quantified using gas chromatography coupled to a mass spectrometer detector (GC-MS). The results showed yields to OLPs above 50% for all catalysts and temperatures. However, the highest yield to OLPs of 67.9% was reached with a NiCoZeo catalyst at 300 °C. In this reaction, a higher yield to hydrocarbons was obtained (84.8%), indicating a cooperative effect between Ni and Co in the catalyst. Hydrocarbons such as heptadecane (C17H36), pentadecane (C15H26), and other alkanes-alkenes with lower carbon chains were the main products. Therefore, deoxygenation of PFAD using a low-cost Ni-Co catalyst was shown to be an economic and viable way to produce diesel-type biofuels.

show abstract

Synthesis of Zeolite A employing Amazon kaolin waste

Cited by 14 publications

References 11 publications

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Efeito do envelhecimento da mistura reacional constituída por resíduo de caulim da Amazônia na síntese da zeólita faujasita

Renewable Diesel Production from Palm Fatty Acids Distillate (PFAD) via Deoxygenation Reactions

Contact Info

Product

Resources

About