Adsorption-Based Synthesis of Environmentally Friendly Heterogeneous Chromium(III) Catalysts for Oxidation Reactions into Kaolinite, Saponite, and Their Amine-Modified Derivatives

Autor(es)

Vieira, Carlos Alexandre ^[1] ; Ferreira, Breno F. ^[1] ; da Silva, Alexandre Fernando ^[1] ; Vicente, Miguel Angel ^[2] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Ciuffi, Katia J. ^[1] ; Nassar, Eduardo J. ^[1] ; de Faria, Emerson H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Franca, Ave Dr Armando Salles Oliveira, Parque Univ 201, BR-14404600 Sao Paulo - Brazil

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

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED NANO MATERIALS; v. 1, n. 8, p. 3867-3877, AUG 2018.
• Citações Web of Science: 0

Resumo

Batch experiments were used to evaluate the Brazilian Sao Simao kaolinite (Kao), the Spanish Yuncillos saponite (Sa), and their derivatives organofunctionalized with 3-aminopropyltriethoxysilane (Kao-APTES and Sap-APTES) as Cr(III) adsorbents in aqueous medium. Cr(III) concentration and interaction time affected Cr(III) adsorption, which depended strongly on surface charge. The adsorption capacities of Kao and Sap increased after functionalization. Cr(III) adsorption reached equilibrium within 30 min for kaolinite solids and within 120 min for saponite solids. Kinetics tests showed that Cr(III) adsorbent interactions did not follow a single model, and all the samples fitted the pseudo-second order model satisfactorily. Equilibrium studies showed that adsorption correctly fits the Langmuir model, but adsorption onto Kao and Sap-APTES fits the Freiindlich model better. Desorption experiments showed that Kao-APTES desorbed only 9.7% of Cr(III) cations under different stressing conditions as compared to 47.8% desorption in the case of Sap-APTES. The solids obtained after Cr(III) adsorption were used as heterogeneous catalysts for cis-cyclooctene oxidation reaction, being promising catalysts (conversion higher than 50%) and not showing leaching of Cr(III). (AU)

• Processo FAPESP: 16/50322-2 - Materials with advanced technological and environmental applications
• Beneficiário: Katia Jorge Ciuffi Pires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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: 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
• 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