Banca de QUALIFICAÇÃO: ANDREZA BERNARDES DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDREZA BERNARDES DA SILVA
DATE: 22/12/2021
TIME: 14:00
LOCAL: MODO REMOTO - https://meet.google.com/fps-mkni-nqk
TITLE:

TiO₂ QUANTUM DOTS: AN INNOVATIVE NANOMATERIAL FOR TEXTILE MATERIALS FUNCTIONALIZATION

KEY WORDS:

TiO2 Quantum Dots, Nanotechnology, Photocatalysis, Textile Engineering, Technological Innovation.

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Têxteis
SUMMARY:

The U.N 2030 agenda aims to achieve sustainability through 17 goals, which can be highlighted: industry, innovation and infrastructure; clean water and sanitation. In this sense, it is necessary to search for sustainable materials and methods, especially in textile processing, one of the main areas of greatest use of water and, consequently, generates a high polluting load. Nanoparticles (NPs) are widely used in photocatalysis studies because of their surface area, it is titanium dioxide (TiO2), which has good optical properties, chemical stability, a band gap of 3.2 eV. In addition to low cost. Lately, researches have explored the reduced size of TiO2 in the range of 1-10 nanometers because in this range, these NPs undergo a quantum confinement and that is why they are called TiO2 quantum dots. The main problem involving TiO2 quantum dots is their agglomeration in the aqueous medium, which makes their use in photocatalysis complex, since a secondary treatment is needed to recover them. Thus, the objective of this work was to synthesize TiO2 quantum dots via sol-gel and immobilize them on textile fabrics for photocatalytic application. In the first study, the soy bean protein knniting  fabric was functionalized by the layer-on-layer method (LBL) where the photocatalytic evaluation was carried out as a function of the concentration of the cationic dye rhodamine B ranging from 2 to 8 ppm. In the second study, the method of application by printing was used on a flat polyester/cotton fabric, carrying out a Box-Behken experimental design and the answer was dye degradation. As a result, the XRD, HRTEM and XPS analyzes revealed that the TiO2 quantum dots were successfully obtained, presenting a tetragonal crystal structure corresponding to the anatase phase with particle size less than 10 nm. Both the functionalized soy fiber mesh and the PES/CO fabric functionalized with TiO2 quantum dots showed excellent photocatalytic results, degrading 97% of the dye to 2 ppm in 120 minutes, while the cotton/polyester fabric showed 100% degradation of the dye at 2ppm and pH 10 in 120 minutes, thus proving the efficiency of both immobilization processes.

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