Grafting of L-proline and L-phenylalanine amino acids on kaolinite through synthesis catalyzed by boric acid

Author(s)

de Araujo, Denis T. ^[1] ; Ciuffi, Katia J. ^[1] ; Nassar, Eduardo J. ^[1] ; Vicente, Miguel A. ^[2] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Bernal, Elena P. ^[2] ; de Faria, Emerson H. ^[1]

Affiliation

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

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

• Document type: Journal article
• Source: APPLIED SURFACE SCIENCE ADVANCES; v. 4, JUN 1 2021.
• Web of Science Citations: 0

Abstract

The amidation reaction catalyzed by boric acid between the amino acids proline and phenylalanine and the alkoxide 3-aminopropyltriethoxysilane was studied. Afterwards, the modified alkoxide was used to functionalize the clay mineral kaolinite. The hybrid material was characterized by powder X-ray diffraction, molecular absorption spectroscopy in the infrared region, thermal analysis and scanning electron microscopy, to understand the influence of the reaction time on the kaolinite intercalation process, in order to improve this functionalization route for both amino acids. The reaction times evaluated varied from 0 to 24 h, keeping the reflux temperature fixed at 180 degrees C, being then reacted with kaolinite previously intercalated with dimethyl sulfoxide (DMSO). After 24 h of reaction the modified alkoxide interacted effectively, replacing the DMSO molecules and resulting in the formation of covalent bonds between the modified alkoxide and the clay. The material showed greater dispersion of the organic phase along the layered matrix, and significantly increased its thermal stability, with maximum loss at 320 degrees C. The sample containing phenylalanine was more agglomerated than that containing proline, with 2.4 times in mol number. In all cases, the crystallinity of the material decreased by the interaction of the modified alkoxide with the kaolinite matrix, the modified alkoxide being partially outside the interlayer space because of its large molecular size. (AU)

• 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: 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: 17/01719-0 - Biohybrid materials (kaolinite-amino acid) as luminescent sensors for emerging pollutants
• Grantee: Denis Talarico de Araujo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 05/00720-7 - Synthesis, characterization and catalytic activity of biomimetic and non-biomimetic systems, in hydrocarbon oxidation, using hydrogen peroxide as oxidant
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/03335-8 - Ironporphyrins as catalysts in oxidation reaction of cyclohexane and Baeyer-Villeger: heterogeneous systems
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/11673-3 - Thin films obtained by spin and dip-coating using sol-gel methodology
• Grantee: Eduardo José Nassar
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/26569-3 - Biohybrid materials (kaolinite-amino acids) as luminescent sensors for organic emmerging pollutants.
• Grantee: Denis Talarico de Araujo
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 17/15482-1 - Novel strategies synthesis to reuse Tanner industry by-products to obtain high-value functional porous materials
• Grantee: Emerson Henrique de Faria
• Support Opportunities: Regular Research Grants