BIBLIOS

Document type
Conference papers

Document subtype
Abstract/Full paper of Invited talk

Title
Modified photo(active) semiconductor nanomaterials for environmental sustainable applications

Participants in the publication
Ferreira, Virginia C (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
Monteiro, OC (Author)

Summary
This work aimed to stably support semiconducting nanoparticles (NPs) onto fibers envisaging the preparation of photoactive hybrid materials for application in environmental remediation and facilitate catalyst recovery. Here, bismuthoxychloride (BiOCl) and bismuthsulphide (Bi2S3) NPs supported on cotton fibers have been successfully used for collagen dye removal by adsorption and photocatalytic degradation under light irradiation. \\\\\\\\n\\\\\\\\nThe cotton surface was modified using in situ straightforward methodologies by precursors impregnation followed by synthesis in water at RT (Cot-BiOCl), and acetone at 56oC (Cot-Bi2S3). The morphological, structural and optical characterisation was performed using several techniques including XRD, DRS, TEM and SEM. Both samples display similar surface loading of NPs.\\\\\\\\nThe as-prepared Cot-BiOCl absorbs mainly in the UV range whereas Cot-Bi2S3 and BiOCl (after sensitisation) absorbs in the UV and visible regions. The Bi2S3 modified cotton shows excellent dye removal by adsorption, while the Cot-BiOCl displays improved photocatalytic response under UV-vis light removing all collagen dyes studied. Further advantage is taken from the Cot-BiOCl allowing the dyes removal under visible light due to the formation of oxygen vacancies on the catalyst surface. The high activity of those materials under UV and visible radiation enabling the efficient use of solar light, together with an easy and fast catalyst recovery, has more economical viability for application in industrial pollutants removal under solar light. Therefore, the use of supported semiconductor catalysts proved to be a promising and suitable approach for future wastewater treatment technologies to be applied for pollutants removal by combined adsorption/photodegradation methodologies with advantage on catalyst recovery.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Event
Book of Abstract of the SPASEC-23 Conference

Publication Identifiers