Síntese e caracterização de filmes auto-organizados contendo UBioC-dot

Abstract

Technological development, the high demand for food production, and the high rates of consumption of these items, on a global scale, have led to an increase in the generation of waste resulting from these processes. These wastes have a high polluting capacity and their disposal cannot be carried out improperly and without prior treatment in the environment. A viable alternative for the sustainable disposal of these wastes is proposed in the present work, in which sewage sludge treated in a UASB reactor was used for the synthesis of carbon dots (C-dots) inserted in self-organized films. C-dots are luminescent nanoparticles that have promising characteristics in various technological applications, such as the sensing of organic and inorganic compounds. In view of this, the thermal decomposition profile of two types of films from the mixture of TRP, citrus pectin and magnesium salt was studied, one with insertion of C-dots functionalized with urea and the other without the addition of this nanomaterial, aiming at a better understanding of the thermal routes of degradability of these compounds. The characterization of the films and the C-dot was carried out through spectroscopic analysis of absorption in the region of UV-Vis, photoluminescence and FTIR, together with TG/DSC-FTIR thermoanalytical techniques, drawing a comparison between the profiles of each film typing. These analyses showed that the functionalization of C-dots provides an increase in the RQ of these nanomaterials, which presented a value of 7% and that their incorporation into the films is significant, with no apparent loss of their luminescence. The influence of the agglomeration effect on the luminescence of these nanoparticles was also evidenced, as indicated by the comparison of F3 in relation to F2. The characterization of the self-organized films evidenced the insertion of the UBioC-dot to the process of structuring the films by the variation observed in the TG/DSC thermoanalytical curves, by the mass variation present in the F1 film in comparison to the F2 and F3. Thus, the greater homogeneous distribution at F2 and its luminescence make it possible to evaluate it as a potential sensor.