| Full text | |
| Author(s): |
de Araujo, D. T.
[1]
;
de Padua, G. S.
[1]
;
Peixoto, V. G.
[1]
;
Ciuffi, K. J.
[1]
;
Nassar, E. J.
[1]
;
Vicente, M. A.
[2]
;
Trujillano, R.
[2]
;
Rives, V
[2]
;
Perez-Bernal, M. E.
[2]
;
de Faria, E. H.
[1]
Total Authors: 10
|
| Affiliation: | [1] Univ Franca, UNIFRAN Grp Pesquisas Mat Lamelares Hibridos GPMa, Av Dr Armando Salles Oliveira, Parque Univ 201, BR-14404600 Franca, SP - Brazil
[2] Univ Salamanca, Dept Quim Inorgan, GIR QUESCAT, Salamanca 37008 - Spain
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | APPLIED CLAY SCIENCE; v. 192, JUL 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
The properties of Eu3+-biohybrid (kaolinite-proline) materials were investigated by powder X-ray diffraction, vibrational spectroscopy, scanning electron microscopy, nitrogen adsorption and photoluminescence to understand how Eu3+ interacts with the biohybrid matrices. Biohybrids were obtained through the conventional route and by two new catalytic routes for functionalization of clay minerals, and were then complexed to Eu3+ ions at a constant proline:Eu3+ molar ratio of 3:1, while the water molecules originally existing in the first coordination sphere of Eu3+ ions in the kaolinite-grafted complexes were replaced by 2-thenoyltrifluoroacetone (tta). The typical Eu3+ emission spectra for solids containing tta revealed the characteristic Eu3+ transitions from fundamental D-5(0) state to excited F-7(J) (J = 0, 1, 2, 3 and 4) states. The lifetime measurements also confirmed that water molecules were exchanged, increasing emission efficiency. The time-resolved spectra allowed to remove the matrix and ligand emissions and thus to evaluate their influence on the emission of the lanthanide ion. After incorporation of Eu3+, the thermal stability of the solids improved. The intercalated europium complexes did not show the same ligand/Eu3+ molar ratio as the free complexes, due to the restricted mobility of the ligands grafted within the interlayer spaces of kaolinite. On the contrary, these complexes showed high internal quantum yields, low luminescence suppression (after tta coordination), preserved the kaolinite layered structure. They also showed a low water molecules coordination number, which made them very attractive for luminescent applications, in addition to bringing high added value, due to a low cost, non-toxicity, non-polluting and high efficiency. (AU) | |
| FAPESP's process: | 16/50322-2 - Materials with advanced technological and environmental applications |
| Grantee: | Katia Jorge Ciuffi Pires |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 98/11022-3 - Oxidacao catalitica biomimetica. |
| Grantee: | Katia Jorge Ciuffi Pires |
| 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: | 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: | 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: | 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: | 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 |
| 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: | 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 |