Preparation, Characterization and Luminescence Study of Chitosan Membrane and Powder Forms with Eu3+ and Tb3+

作者：Oliveira Roseane S; Maia Danielle O; Pereira Marcia R; Silva Fabiana R G E^*

来源：Journal of Macromolecular Science Part A-Pure and Applied Chemistry, 2010, 47(5): 392-398.

DOI：10.1080/10601321003659457

• Chitosan
• membrane
• lanthanide
• luminescence

Chitosan membranes with trivalent lanthanide ion Eu3+ were prepared at a ratio of 3:1 w/w ( chitosan: lanthanide). There was no membrane formation at a ratio of 1:1 w/w (chitosan: Eu3+ or Tb3+); in this case a white solid powder was obtained. Both chitosan compounds were characterized by elemental analysis (CHN), thermal analysis (TG/DTG), scanning electron microscopy (SEM) and luminescence spectroscopy. CHN analysis was performed only for chitosan compounds in powder form, suggesting that these compounds have the general formula QUILn.6H(2)O, where QUI = Chitosan and Ln = Eu3+ or Tb3+. The results of TG/DTG curves for chitosan membranes with Eu3+ ion indicate that the introduction of this metal into the chitosan structure causes gradual degradation in residual carbons, showing lower weight loss in the Eu3+ membranes compared to pure chitosan membrane. Analysis of luminescence demonstrated that chitosan membranes with Eu3+ ion exhibit emission in the visible region, showing emission bands from chitosan and Eu3+ moieties. For chitosan with Eu3+ and Tb3+ ions compounds, in powder form, the analysis of luminescence suggested that chitosan is not transferring energy to the lanthanide ion; however, the chemical region where the lanthanide ion is found breaks the selection rules and favors the emission of these ions.

• 出版日期2010