Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces

Urea modified TiO<sub>2</sub> nanoparticles were synthesized at different TiO<sub>2</sub>: urea ratios (10, 30 and 60 (%wt) named UTiO2-10, 30 and 60) by sol-gel method and annealing at 400 °C during 1 h. Characterization revealed the presence of TiO<sub>2</sub> n...

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Autores principales: Pérez Obando, Juliana, Marín Silva, Diego Alejandro, Pinotti, Adriana Noemí, Pizzio, Luis René, Osorio Vargas, Paula, Rengifo Herrera, Julián Andrés
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Exactas
Química
Visible light responsive TiO2
Melon/TiO2 heterojunction
Chitosan films
Urea
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124478
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124478
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Visible light responsive TiO2
Melon/TiO2 heterojunction
Chitosan films
Urea
spellingShingle Ciencias Exactas
Química
Visible light responsive TiO2
Melon/TiO2 heterojunction
Chitosan films
Urea
Pérez Obando, Juliana
Marín Silva, Diego Alejandro
Pinotti, Adriana Noemí
Pizzio, Luis René
Osorio Vargas, Paula
Rengifo Herrera, Julián Andrés
Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
topic_facet Ciencias Exactas
Química
Visible light responsive TiO2
Melon/TiO2 heterojunction
Chitosan films
Urea
description Urea modified TiO<sub>2</sub> nanoparticles were synthesized at different TiO<sub>2</sub>: urea ratios (10, 30 and 60 (%wt) named UTiO2-10, 30 and 60) by sol-gel method and annealing at 400 °C during 1 h. Characterization revealed the presence of TiO<sub>2</sub> nanoparticles with visible light absorption (between 400 and 500 nm) probably due by the formation of thermolysis urea byproducts such as melon, which may induce a TiO<sub>2</sub>/melon heterojunction. Then, modified nanoparticles were immobilized on chitosan films by adding 30% (70QS/30UTiO<sub>2</sub>) and 50% 50QS/50UTiO<sub>2</sub>) of UTiO<sub>2</sub> nanoparticles. Functionalized films were characterized by SEM-EDS, DRS and AFM. Photo-induced degradation of malachite green stains was evaluated on these films under different wavelengths. Upon UV-A + visible light irradiation, films showed good activity even slightly better than those containing Evonik P-25 (70QS/30P-25). Upon visible light between 450 and 800 nm, films evidenced a satisfactory performance but slower than under UV-A + visible light irradiation whereas the photobleaching activity of 70QS/30P-25 was very poor. When visible light irradiation with wavelengths higher than 590 nm was used, a slight photobleaching was also observed. DRS spectra taken at different irradiation times showed that dye underwent N-demethylated oxidative reactions either upon UV–vis or visible light irradiation. ATR-FTIR measurements revealed the generation of benzophenones after 6 h of irradiation probably suggesting the formation of singlet oxygen under visible light. 70QS/30UTiO<sub>2</sub>-10 films showed a good photo-bleaching activity after 18 h of continuous UV-A + visible light irradiation.
format Articulo
Preprint
author Pérez Obando, Juliana
Marín Silva, Diego Alejandro
Pinotti, Adriana Noemí
Pizzio, Luis René
Osorio Vargas, Paula
Rengifo Herrera, Julián Andrés
author_facet Pérez Obando, Juliana
Marín Silva, Diego Alejandro
Pinotti, Adriana Noemí
Pizzio, Luis René
Osorio Vargas, Paula
Rengifo Herrera, Julián Andrés
author_sort Pérez Obando, Juliana
title Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
title_short Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
title_full Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
title_fullStr Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
title_full_unstemmed Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO<sub>2</sub> absorbing visible-light in solid-gas interfaces
title_sort degradation study of malachite green on chitosan films containing heterojunctions of melon/tio<sub>2</sub> absorbing visible-light in solid-gas interfaces
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/124478
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