Tipo
Artigos em Conferência
Tipo de Documento
Resumo
Título
BiOCl and TiO2 nanoparticles modified cotton fibers by in situ straightforward approach for wastewater treatment by photocatalysis
Participantes na publicação
Virginia C Ferreira (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
A J Goddard (Author)
OC Monteiro (Author)
Dep. Química e Bioquímica
CQE
Resumo
Wastewater decontamination is urging for efficient solutions to overcome water shortage and contamination problems. In this context, the removal of pollutants by advanced oxidation processes (AOPs), such as photocatalysis, is a suitable approach for water treatment. The use of supported catalysts, for example on fibers, membranes, polymers and resins [1], allows to overcome some drawbacks associated to the use of nano-powders such as facilitating its separation at the end of the process and avoiding their release to the environment [2]. In that instance, textile fibers have been used as substrates for semiconductor nanocatalysts attachment retaining its activity and displaying promising results for self-cleaning, UV shielding and photocatalytic applications [3].\\nIn this work, cotton fibers have been modified with semiconductor nanoparticles (NPs), BiOCl or TiO2, using in situ straightforward approaches [4]. The supported nanocatalysts were characterised by SEM, TEM, XRD and DRS. The plate-like crystalline BiOCl particles were distributed on the fiber surface whereas the small sized, crystalline anatase TiO2 nanoparticles formed a continuous layer coating the fibers. The NPs immobilisation on the fibers surface conferred their properties to the resulting materials, Cot-NPs. The NPs granted their photocatalytic ability to the modified fibers allowing its use for pollutants removal. Here, a model dye molecule, naphthol blue black (NBB), was applied for photocatalytic removal tests. The results obtained over time during the exposure to UV-vis light irradiation showed good photoactivity of both Cot-BiOCl and Cot-TiO2 composites. The photodegradation process involves distinct oxidant species depending on the catalyst used, hydroxyl radical (•OH) for TiO2 and superoxide radical (O2•-) for BiOCl. Both modified fiber materials show promising potential applicability for photocatalysis and self-cleaning purposes.
Editor
4th International Conference on Photocatalytic and Advanced Oxidation Technologies for the Treatment of Water, Air, Soil and Surfaces (PAOT-4) and 3rd International Conference on New Photocatalytic Materials for Environment, Energy and Sustainability (NPM-3)
Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Evento
Book of Abstracts
Identificadores da Publicação
Anotações
Oral communication, International conference