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

Author(s):Show less -

Pereira, Priscila Martins ^[1] ; Ferreira, Breno Freitas ^[1] ; Oliveira, Nathalia Paula ^[1] ; Nassar, Eduardo Jose ^[1] ; Ciuffi, Katia Jorge ^[1] ; Angel Vicente, Miguel ^[2] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Gila, Antonio ^[3] ; Korili, Sophia ^[3] ; de Faria, Emerson Henrique ^[1]

Affiliation

^[1] Univ Franca, Grp Pesquisas Mat Lamelares Hibridos GPMatLam, Av Dr Armando Salles Oliveira, BR-14404600 Franca 201 - Brazil

^[2] Univ Salamanca, GIR QUESCAT Dept Quim Inorgan, E-37008 Salamanca - Spain

^[3] Univ Publ Navarra, INAMAT Dept Quim Aplicada, Pamplona 31006 - Spain

• Document type: Journal article
• Source: APPLIED SCIENCES-BASEL; v. 8, n. 4 APR 2018.
• Web of Science Citations: 8

Abstract

The present work reports the synthesis of zeolites from two metakaolins, one derived from the white kaolin and the other derived from the red kaolin, found in a deposit in the city of Sao Simao (Brazil). The metakaolins were prepared by calcination of the kaolins at 600 degrees C; zeolite A was obtained after alkali treatment of the metakaolins with NaOH. The resulting solids were characterized by powder X-ray diffraction, thermal analysis, scanning electron microscopy, and nitrogen adsorption/desorption at 196 degrees C, which confirmed formation of zeolite A. The zeolites were applied as adsorbents to remove methylene blue, safranine, and malachite green from aqueous solutions. The zeolites displayed high adsorption capacity within short times (between one and five minutes); qt was 0.96 mg/g. The equilibrium study showed that the zeolites had higher adsorption capacity for malachite green (qe = 55.00 mg/g) than for the other two cationic dyes, and that the Langmuir isotherm was the model that best explained the adsorption mechanism. (AU)

• FAPESP's process: 16/01501-1 - Multifunctional catalysts for advanced oxidation processes employing biogenic matrices or clays
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/19523-3 - Functional Biohybrid materials based on layered and/or fibrous natural clays with multifaceted applications
• Grantee: Emerson Henrique de Faria
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/08618-0 - Synthesis and characterization of zeolites obtained from natural clays for dye adsorption
• Grantee: Priscila Martins Pereira Rodarte
• Support Opportunities: Scholarships in Brazil - Scientific Initiation