Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermal and morphological study of chitosan metal complexes

Full text
Author(s):
Pereira, Fernanda Stuani ; Lanfredi, Silvania ; Perez Gonzalez, Eduardo Rene ; da Silva Agostini, Deuber Lincon ; Gomes, Homero Marques ; Medeiros, Ricardo dos Santos
Total Authors: 6
Document type: Journal article
Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 129, n. 1, p. 291-301, JUL 2017.
Web of Science Citations: 5
Abstract

The synthesis of chitosan Schiff bases, N-benzylidene chitosan (CTB), 4-dimethylamino-benzylidene chitosan (CTDB) and 4-nitro-benzylidene chitosan (CTNB), and their interaction with Cu2+, Zn2+ and Ni2+ were studied. The content of metal ions was determined by atomic absorption spectrometry, and the results showed that chitosan exhibited higher chelating capacity for the metal ions. Morphological changes of Schiff bases and complexes were demonstrated by SEM images. The presence of crystals attributed to copper sulfate adsorbed on the polymers surface was also observed, which indicates that part of the metal content is in the salt adsorbed and might influence in their further application studies. X-ray diffraction patterns showed that the formation of complexes resulted in the decrease in crystallinity. The thermal behavior of derivative and metal complexes were studied by thermogravimetric analysis, differential thermogravimetric analysis and differential scanning calorimetry. The results showed that the presence of new groups and metal ions bonded to chitosan affected their thermal stability. (AU)

FAPESP's process: 12/13901-3 - Study of the biopolymers chitin and chitosan chemically modified for metal chelation and for carbon dioxide capture and fixation.
Grantee:Fernanda Stuani Pereira
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/24487-6 - Study of reactions of clean synthesis and chemical modification of the biodiesel and fusel oil for preparation of organic carbonate and carbamates using carbon dioxide in the presence of organocatalysts and heterogeneous catalysts
Grantee:Eduardo Rene Perez Gonzalez
Support type: Regular Research Grants
FAPESP's process: 13/26576-6 - Synthesis of chitin and chitosan derivatives as materials for metalic cations capture
Grantee:Ricardo dos Santos Medeiros
Support type: Scholarships in Brazil - Scientific Initiation