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Biodegradation as treatment proposal and recovery of carbon nanotubes arising from residues of biodegradable polymeric nanocomposites

Grant number: 19/15976-0
Support type:Regular Research Grants
Duration: October 01, 2020 - September 30, 2022
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Ana Paula Lemes
Grantee:Ana Paula Lemes
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Federal de São Paulo (UNIFESP). Campus São José dos Campos. São José dos Campos , SP, Brazil
Assoc. researchers:Andrey dos Santos ; Danielle Maass ; Mirabel Cerqueira Rezende ; Nelson Manuel Viana Da Silva Lima ; Wilson Jose Fernandes Lemos Junior

Abstract

The aim of this project will be to investigate the carbon nanotubes (CNT) recovery from biodegradable polymer nanocomposites with CNT, and the use of these recovered CNT (CNT-rec) in the production of new polymer nanocomposites. Therefore, the polymer nanocomposites will be produced through biodegradable polymer in different CNT concentrations such as 1 and 2% (w/w). These nanocomposites will be characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy - field emission gun (SEM-FEG), tensile tests and electrical conductivity measurements. After that, biodegradation process of nanocomposites will be carried out in a bioreactor. In order to evaluate the effect of CNT in microbiota during biodegradation process, Omics technology such as "Next Generation Sequencing" will be used. At the end of biodegradation process, the CNT recovered from final residue of biodegradation process will be analyzed according to a thermal treatment or acid treatment for their purification and, after they will be characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, atomic force microscopy (AFM) and x-ray diffraction (XRD). A NTC toxicity study will be also done using miniaturized in vitro assay with ciliate protozoan Tetrahymena pyriformis. To evaluate the possibility to use the CNT-rec in the production of new nanocomposites, the CNT-rec will be use in the production of biodegradable polymer/CNT-rec 1% and 2% (w/w) nanocomposites that will be characterized as describe before. The comparation between these properties will provide very important information about the preservation of CNT properties and their reuse, which will allow to verify the efficiency of the treatment proposed in this project for the residue generated by these nanocomposites. (AU)