Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 346, Issue -, Pages 60-69Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2017.05.047
Keywords
Photocatalysis; Textile functionalization; TiO2-SiO2; HY zeolite; Composites; Rhodamine B
Categories
Funding
- CAPES from Brazil
- Norte Portugal Regional Operational Programme (NORTE) under European Regional Development Fund (ERDF) [NORTE-01-0145-FEDER-000006, NORTE-01-0145-FEDER-000004]
- ERDF through COMPETE - Programa Operacional Competitividade e Internacionalizacao (FOCI) [POCI-010145-FEDER-006984]
- FCT - Fundacao para a Ciencia e a Tecnologia [PTDC/AAGTEC/5269/2014, UID/QUI/00686/2013, UID/QUI/0686/2016]
- Fundação para a Ciência e a Tecnologia [UID/QUI/00686/2013, UID/QUI/0686/2016] Funding Source: FCT
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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. (C) 2017 Elsevier B.V. All rights reserved.
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