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| Author(s): |
Thais Regi Macedo
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Química |
| Defense date: | 2009-10-09 |
| Examining board members: |
Claudio Airoldi;
Eder Claudio Lima;
Regina Celia Galvão Frem di Nardo;
Italo Odone Mazali;
André Luiz Barboza Formiga
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| Advisor: | Claudio Airoldi |
| Abstract | |
The present study describes the preparation, characterization and application of the new inorganic-organic nanostructured hybrid materials, prepared by the functionalization process of the layered surface of derivative RUB-18 material, its acidic, H-RUB-18 and intercalated, CTA-RUB-18 forms. For this process were used silylating agents containing nitrogen, sulfur and oxygen as active atoms on the molecules and two different methods. The X ray diffractograms showed the crystallinity of the materials and the electron scanning microscopy (SEM) the morphology and size of the particles formed. The nuclear magnetic resonance (NMR) spectra for Si and C nuclei in the solid state show that the syntheses were successfully performed. From the obtained elemental analysis and thermogravimetry (TG) results the amount of organic groups immobilized on the surface was determined. The maximum number was 3.79 mmol groups per gram of material, a value near to the maximum of its capacity, 3.85 mmol g. The nanostructured hybrids present thermal stability up to 540 K. The nitrogen functionalized materials were applied for sorption of copper, nickel and cobalt from aqueous solution, while the sulfur materials were used for cadmium and lead sorption from aqueous solution. The sorption isotherms were obtained by the batchwise process and the data were adjusted to the Freundlich and Langmuir- Freundlich models, considering heterogeneous surfaces. These data supply information for the interactive knowledge of the systems, considering the energy of interaction. The interactive effect of cation/basic centers at the solid/liquid interface was evaluated through microcalorimetry and the thermodynamic values, obtained in these heterogeneous systems, give conditions for establishment of a favorable energetic order in the interaction. The obtained results showed the viability of application of the materials as efficient sorbents to extract cations from an ecosystem. (AU) | |