Photocatalytic degradation of Rhodamine B dye by cotton textile coated with SiO2-TiO2 and SiO2-TiO2-HY composites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Landi, S (Autor) Outra; Carneiro, J (Autor) Outra; Ferdov, S (Autor) Outra; Fonseca, AM (Autor) Outra; Neves, IC (Autor) Outra; Ferreira, M (Autor) Outra; Parpot, P (Autor) Outra; O.S.G.P. Soares (Autor) FEUP; Manuel Fernando R Pereira (Autor) FEUP

Revista

Título: Journal of Photochemistry and Photobiology A: Chemistry

Vol. 346

Páginas: 60-69

ISSN: 1010-6030

Editora: Elsevier

Indexação

ISI Web of Knowledge - 18 Citações

ISI Web of Science

Scopus - 50 Citações

Outras Informações

ID Authenticus: P-00M-XAP

DOI: 10.1016/j.jphotochem.2017.05.047

Abstract (EN): This work is devoted to study the photocatalytic ability of cotton textiles functionalized with SiO2-TiO2 and SiO2-TiO2-HY composites to degrade a dye molecule. Coatings were prepared by sol-gel method and calcined at different temperatures in a range of 400-750 degrees C. FTIR confirmed the existence of Si-O-Ti bounds and the band located in the region between 570 and 600 cm(-1) was used to calculate the framework Si/Al ratio of HY in the SiO2-TiO2-HY composites. XRD confirmed the presence of nanosized TiO2 (anatase phase) in all calcined composites. Nitrogen adsorption isotherms showed a decrease in surface area and pore volume for higher calcination temperature. A simple mechanical process was used to impregnate the different composites on the cotton substrates. The photocatalytic activity of cotton textiles functionalized with SiO2-TiO2 and SiO2-TiO2-HY composites was tested via the degradation of Rhodamine B (RhB) dye under similar solar irradiation. The best catalytic performance was achieved with the SiO2-TiO2 and SiO2-TiO2-HY composites subjected to a calcination treatment at 400 degrees C, whereas SiO2TiO2 presented a decolourization and mineralization around 94% and 89%, respectively, after 2 h of irradiation. Furthermore, the products of RhB degradation were analysed and identified by using HPLCESI-MS and ion chromatography techniques and a photocatalytic mechanism was proposed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10