Motta, Fabiana Villela daMelo, Alan Jones Lira de2025-09-162025-09-162025-07-17MELO, Alan Jones Lira de. Obtenção de nanofibras de TiO2, dopadas e co-dopadas com Nd e Sm por eletrofiação: estudo da atividade fotocatalíticas no fenol e norfloxacino. Orientadora: Dra. Fabiana Villela da Motta. 2025. 123f. Tese (Doutorado em Ciência e Engenharia de Materiais) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2025.https://repositorio.ufrn.br/handle/123456789/65610Compounds such as pharmaceuticals and phenol are an increasing environmental concern, entering ecosystems due to the improper disposal of medications, industrial waste, and domestic sewage. Prolonged exposure to these pollutants can lead to antimicrobial resistance and toxicity to aquatic organisms, affecting their reproduction and altering aquatic communities. Advanced Oxidation Processes (AOPs) are effective solutions for degrading organic pollutants and are widely used in wastewater treatment. TiO2, naturally present on the Earth's surface, possesses excellent photocatalytic properties and is commonly used in wastewater treatment. When doped with metal ions, it shows improved light absorption, reduced charge recombination, surface modifications, and increased efficiency in pollutant degradation reactions. Based on this potential, this study developed ceramic TiO2 nanofibers doped and co-doped with Nd3+ and Sm3+ ions at concentrations of 0.5%, 1.0%, and 1.5% mol using the electrospinning method, followed by heat treatment, aiming to improve photocatalytic efficiency in degrading the pollutants phenol and norfloxacin. XRD patterns confirmed the presence of only the anatase phase of TiO2, even after doping. FE-SEM analysis revealed uniform and continuous nanofibers randomly arranged, and BET analysis indicated an increase in surface area after doping. UV-Vis spectroscopy showed changes in the band gap and shifts in the absorbance curve due to doping and co-doping. Photoluminescence emission spectra displayed narrow peaks characteristic of the rare-earth elements Nd and Sm. Photocatalytic tests indicated a 99.99% degradation of phenol with NF T0.5NS and 99.90% for norfloxacin with NF T1.5NS under UV radiation, as confirmed by the residual antimicrobial activity test, in which no inhibition zone was observed in the degraded solution. To assess the reusability of the photocatalysts, the NFs underwent four reuse cycles, with NF T0.5NS maintaining 43% efficiency and NF T1.5NS retaining 82% after the cycles. According to the results obtained, TiO2 nanofibers doped and co-doped with rare-earth ions appear to be promising materials with potential applications in the photodegradation of pollutants such as phenol and the antibiotic norfloxacin.pt-BRAcesso AbertoTiO2EletrofiaçãoFotocatáliseFenolNorfloxacinodoctoralThesisENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA