Artículo
Chitosan films containing TiO2 nanoparticles modified with tungstophosphoric acid for the photobleaching of malachite green in solidgas interfaces upon different wavelengths
Rengifo Herrera, Julian Andres
; Marín Silva, Diego Alejandro
; Mendoza-Portillo, Edita; Pinotti, Adriana Noemi
; Pizzio, Luis Rene
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Fecha de publicación:
02/2018
Editorial:
Elsevier Science
Revista:
Journal of Molecular Catalysis A: Chemical
ISSN:
1381-1169
e-ISSN:
2468-8231
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Chitosan (CS) films containing visible light absorbing TiO2 nanoparticles modified with tungstophosphoric acid (TPA-TiO2) at different TPA-TiO2:CS ratios (10%, 20%, 30% and 40% (w/w) called CS/TPA-TiO2-10, CS/TPA-TiO2-20, CS/TPA-TiO2-30, and CS/TPA-TiO2-40 respectively) were prepared. Films were characterized by DRS, SEM-EDS, XRD, ATR-FT-IR, and contact angle (CA). Materials were evaluated in malachite green (MG) photobleaching solid-gas interface reactions upon different wavelengths. SEM-EDS micrographs showed that TPA-TiO2 nanoparticles were well dispersed through the CS film. According to ATR-FT-IR results, the interactions between TPA-TiO2 nanoparticles and the CS functional groups were weak. Regarding the MG photobleaching reactions, CS/TPA-TiO2-30 film showed the highest activity upon UV-A + visible irradiation, which was even higher than that of chitosan films containing the same amount of Evonik P-25 (CS/P25-30). It was also observed by DRS that the main absorption band of malachite green underwent a hypsochromic shifting caused by oxidative reactions of N-demethylation. On the other hand, at wavelengths higher than 450 nm (Vis-1), CS/TPA-TiO2-30 films showed a marked dye photobleaching. Finally, upon irradiation at wavelengths above 590 nm (Vis-2), a slight color fading was observed. These results revealed that CS/TPA-TiO2-30 films were efficient in the photobleaching of malachite green in solid-gas interfaces through an oxidative path by photocatalytic and photosensitized routes. CS/TPA-TiO2-30 films showed high stability and MG photobleaching capacity after 5 reuse cycles.
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Colecciones
Articulos(CIDCA)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos de CENTRO DE INV EN CRIOTECNOLOGIA DE ALIMENTOS (I)
Articulos(CINDECA)
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Articulos de CENTRO DE INV EN CS.APLICADAS "DR.JORGE J.RONCO"
Citación
Rengifo Herrera, Julian Andres; Marín Silva, Diego Alejandro; Mendoza-Portillo, Edita; Pinotti, Adriana Noemi; Pizzio, Luis Rene; Chitosan films containing TiO2 nanoparticles modified with tungstophosphoric acid for the photobleaching of malachite green in solidgas interfaces upon different wavelengths; Elsevier Science; Journal of Molecular Catalysis A: Chemical; 448; 2-2018; 1-9
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