Synthesis of Zeolite A from Metakaolin and Its Application in the Adsorption of Cationic Dyes

Pereira, Priscila Martins Mateus de Oliveira; Ferreira, Breno F.; Oliveira, Nathalia Paula; Nassar, Eduardo J.; Ciuffi, Kátia J.; Vicente, Miguel Á.; Trujillano, Raquel; Rives, V.; Gil, Antonio; Korili, S.A.; Faria, Emerson H. de

doi:10.3390/app8040608

Cited by 47 publications

(21 citation statements)

References 34 publications

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“…6). This crystallization of Linde type A zeolite from metakaolin was reported in previous studies (Heller-Kallai & Lapides, 2007; Ayele et al , 2016; Pereira et al , 2018). The formation of zeolite A occurs as a product of the re-precipitation of H 2 SiO 4 2- and Al(OH) 4 - species dissolved from the metakaolin in contact with the alkaline solution (Peng et al , 2018).…”

Section: Resultssupporting

confidence: 85%

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Structural transformation of kaolin as an active matrix for the in situ synthesis of zeolite Y

et al. 2020

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To produce an optimized matrix for the in situ crystallization of zeolite Y, a commercial kaolin chemically treated with NaOH solution at 97°C for 24 h and thermally transformed from 750 to 1100°C was studied. The kaolin calcined at 750°C has 20% more reactive tetrahedral aluminium species for the synthesis of zeolite Y than kaolin calcined at 865°C. The kaolin calcined at 1000°C has amorphous silica zones that may be extracted using caustic solution; this increases the surface area by a factor of 16 and generates mesopores ~5 nm in diameter. These structural changes in the calcined and treated kaolins were combined to prepare microspheres of the mesoporous matrix, upon which well-dispersed crystals of zeolite Y crystallized.

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Section: Resultssupporting

confidence: 85%

Section: Aciditysupporting

confidence: 78%

Structural transformation of kaolin as an active matrix for the in situ synthesis of zeolite Y

et al. 2020

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“…Values of S MB of ca. 60–80 m 2 /g were found, similar to values reported in the literature [15,30,37].…”

Section: Resultssupporting

confidence: 90%

White and Red Brazilian São Simão’s Kaolinite–TiO2 Nanocomposites as Catalysts for Toluene Photodegradation from Aqueous Solutions

et al. 2019

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The presence of volatile organic compounds in groundwater is a major concern when it is used as a drinking water source because many of these compounds can adversely affect human health. This work reports on the preparation and characterization of white and red Brazilian São Simão’s kaolinite-TiO2 nanocomposites and their use as catalysts in the photochemical degradation of toluene, a significant volatile organic compound. The nanocomposites were prepared by a sol-gel procedure, using titanium bis(triethanolaminate)diisopropoxide as a precursor. Thermal treatments of the nanocomposites led to different polymorphic titania phases, while the clay changed from kaolinite to metakaolinite. This structural evolution strongly affected the photocatalytic degradation behavior—all the solids efficiently degraded toluene and the solid calcined at 400 °C, formed by kaolinite and anatase, showed the best behavior (90% degradation). On extending the photochemical treatment up to 48 h, high mineralization levels were reached. The advantage of photodegradation using the nanocomposites was confirmed by comparing the results from isolated components (titanium dioxide and kaolinite) to observe that the nanocomposites displayed fundamental importance to the photodegradation pathways of toluene.

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“…or natural clays, for instance, kaolinite and halloysite. Using those natural minerals for the synthesis of zeolite and zeolite-geopolymer hybrid bulk materials is a topical issue [3,5,6]. Despite the fact that both kaolinite (Al 2 Si 2 O 5 (OH) 4 ) and halloysite (Al 2 Si 2 O 5 (OH) 4 •2H 2 O) have similar compositions [7], their reactivity is different.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Activation of Kaolin Group Minerals

et al. 2020

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Zeolites can be obtained in the process of the alkali-activation of aluminosilicate precursors. Such zeolite–geopolymer hybrid bulk materials merge the advantageous properties of both zeolites and geopolymers. In the present study, the effect of the type and concentration of an activator on the structure and properties of alkali-activated metakaolin, and metahalloysite was assessed. These two different kaolinite clays were obtained by the calcination of kaolin and halloysite, and then activated with sodium hydroxide and water glass. The phase compositions were assessed by X-ray diffraction, the microstructure was observed via scanning electron microscope, and the structural studies were conducted on the basis of the infrared spectra. The structure and properties of the obtained alkali-activated materials depend on both the type of a precursor and the type of an activator. The formation of zeolite phases was observed when the activation was carried out with sodium hydroxide alone, or with a small addition of water glass, regardless of the starting material used. The higher proportion of silicon in the activator solution does not give crystalline phases, but only an amorphous phase. Geopolymers based on metahalloysite have better compressive strength as the result of the better reactivity of metahalloysite compared to metakaolin.

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Synthesis of Zeolite A from Metakaolin and Its Application in the Adsorption of Cationic Dyes

Abstract: Featured Application: Zeolites obtained from natural clays by simple methods are potential efficient adsorbents of cationic dyes. Zeolites obtained from natural clays by simple methods may be used as efficient adsorbents of cationic dyes.

Cited by 47 publications

References 34 publications

Structural transformation of kaolin as an active matrix for the in situ synthesis of zeolite Y

Structural transformation of kaolin as an active matrix for the in situ synthesis of zeolite Y

White and Red Brazilian São Simão’s Kaolinite–TiO2 Nanocomposites as Catalysts for Toluene Photodegradation from Aqueous Solutions

Alkaline Activation of Kaolin Group Minerals

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