| 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: | 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 Opportunities: | Regular Research Grants |
| 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 Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/26576-6 - Synthesis of chitin and chitosan derivatives as materials for metalic cations capture |
| Grantee: | Ricardo dos Santos Medeiros |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |