Tipo
Artigos em Revista
Tipo de Documento
Artigo Completo
Título
Comparative study of powder and cotton-supported BiOCl particles on the photocatalytic degradation of industrial pollutants
Participantes na publicação
Virginia C. Ferreira (Author)
Dep. Química e Bioquímica
Dep. Química e Bioquímica
William R. Wise (Author)
O.C. Monteiro (Author)
Dep. Química e Bioquímica
CQE
Resumo
This work compares the photocatalytic performance of powder and supported bismuthoxychloride (BiOCl) catalysts. Semiconducting nanoparticles (NPs) were immobilised onto cotton fibres (Cot) to prepare photoactive hybrid materials (Cot-BiOCl) for application in environmental remediation and facilitate catalyst recovery. The cotton modification was accomplished using simple in situ methodologies of reactant impregnation followed by BiOCl synthesis in water at room temperature. Using this methodology, it was possible to load 14 mg of BiOCl NPs per gram of modified cotton. The as-prepared material absorbs mainly in the UV range. However, after an easy in situ light sensitisation of the BiOCl, and due to the formation of oxygen vacancies on the catalyst surface, the sensitised material (BiOClUV) starts to absorb in the visible range. Its bandgap energy, Eg, shifts from 3.37 to 1.99 eV thus allowing its use under visible light. The photoluminescence (PL) analysis suggests lower recombination rate of the electron-hole pairs conferring enhanced photoactivity to the self-sensitised BiOCl. Under UV–visible light irradiation the Cot-BiOCl photocatalytically degraded a range of collagen dyes with high efficiency, ≥ 73% in 1 h. After light sensitisation, the modified cotton fibres also allow a swift degradation of collagen dyes at a lower cost under visible light irradiation, 88 ≥ removal % ≥ 45, within 3 h. Additionally, the composite reutilisation and the contribution of the substrate architecture on the composite stability is highlighted. The approach used, along with the high activity of the catalyst, displays better economic viability for application in industrial pollutant removal by enabling efficient use of solar light, and an easy and swift catalyst recovery.
Data de Submissão/Pedido
2020-02-21
Data de Aceitação
2020-07-23
Data de Publicação
2020-07
Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Suporte
Ceramics International
Identificadores da Publicação
ISSN - 0272-8842
Editora
Elsevier BV
Identificadores do Documento
DOI -
https://doi.org/10.1016/j.ceramint.2020.07.240
URL -
http://dx.doi.org/10.1016/j.ceramint.2020.07.240
Identificadores de Qualidade
SCOPUS Q1 (2019) - 6.1 - Materials Chemistry
SCOPUS Q1 (2019) - 6.1 - Surfaces, Coatings and Films
Web Of Science Q1 (2020) - 4.527 - MATERIALS SCIENCE, CERAMICS - SCIE
SCIMAGO Q1 (2020) - 0.936 - Materials Chemistry
SCIMAGO Q1 (2020) - 0.936 - Surfaces, Coatings and Films
Keywords
Photocatalysis
Optical properties
Fibres
Composites
Powders: Chemical preparation