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

Autor(es):Mostrar menos -

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: APPLIED SCIENCES-BASEL; v. 8, n. 4 APR 2018.
• Citações Web of Science: 8

Resumo

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)

• Processo FAPESP: 16/01501-1 - Catalisadores multifuncionais para processos oxidativos avançados empregando matrizes biogênicas ou argilas
• Beneficiário: Katia Jorge Ciuffi Pires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19523-3 - Materiais biohíbridos funcionais baseados em argilas lamelares e/ou fibrosas com aplicações multifacetadas
• Beneficiário: Emerson Henrique de Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/08618-0 - Síntese e caracterização de zeólitas obtidas a partir de argilas naturais para adsorção de corantes
• Beneficiário: Priscila Martins Pereira Rodarte
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica