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

• Type: Article in International Scientific Journal
• Date: 2017

Authors

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

Journal

Title: Journal of Photochemistry and Photobiology A: Chemistry

Vol. 346

Pages: 60-69

ISSN: 1010-6030

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 18 Citations

ISI Web of Science

Scopus - 50 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10