Synthesis and characterization of ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Synthesis and characterization of ti-nb(2)o(5)catalysts for discoloration reaction of bromophenol blue and indigo carmine dyes
Auteur(s) :
Azevedo Rafael, Raphaela [Auteur]
Bellot Noronha, Fabio [Auteur]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Gaspar, Alexandre Barros [Auteur]
Bellot Noronha, Fabio [Auteur]
Universidade Federal Fluminense [Rio de Janeiro] [UFF]
Gaspar, Alexandre Barros [Auteur]
Titre de la revue :
Topics in Catalysis
Nom court de la revue :
Top. Catal.
Date de publication :
2020-07-06
ISSN :
1022-5528
Mot(s)-clé(s) en anglais :
Indigo carmine
Bromophenol blue
nb(2)O(5)mixed oxides
TiO2
Photocatalysis
Bromophenol blue
nb(2)O(5)mixed oxides
TiO2
Photocatalysis
Discipline(s) HAL :
Chimie/Catalyse
Résumé en anglais : [en]
This work investigated the photodegradation of bromophenol blue (BPB) and indigo carmine (IC) dye under UV–Visible light using pure oxides of titanium and niobium, as well as TiO2-Nb2O5 oxides containing 0.5, 2.5 and 5 wt% ...
Lire la suite >This work investigated the photodegradation of bromophenol blue (BPB) and indigo carmine (IC) dye under UV–Visible light using pure oxides of titanium and niobium, as well as TiO2-Nb2O5 oxides containing 0.5, 2.5 and 5 wt% of TiO2, prepared by wet impregnation of Nb2O5 with Ti tert-butoxide under inert atmosphere. The results of XRD and Raman spectroscopy showed the presence of anatase TiO2 phase and T-Nb2O5 phase with orthorhombic structure in the pure TiO2 and Nb2O5 oxides, respectively. The Nb2O5 oxides doped with TiO2 presented a T-Nb2O5 phase, but there was no formation of TiNb2O7. TiO2 anatase was observed in the mixed oxide with higher Ti content (5 wt% TiO2). A zeta potential analysis showed positive surface charge values for titanium oxide and negative for niobium oxide and mixed oxides. The addition of up to 5 wt% of the TiO2 fold the activity of Nb2O5 in the discoloration of both dyes. Pure TiO2 exhibits higher initial activity, which could be related to its positive PZC and higher attraction to sulphonic groups present in the dyes. Despite of the lower initial rate, 2.5 and 5% TiNb catalysts achieved full degradation of the dyes after 4 h of reaction.Lire moins >
Lire la suite >This work investigated the photodegradation of bromophenol blue (BPB) and indigo carmine (IC) dye under UV–Visible light using pure oxides of titanium and niobium, as well as TiO2-Nb2O5 oxides containing 0.5, 2.5 and 5 wt% of TiO2, prepared by wet impregnation of Nb2O5 with Ti tert-butoxide under inert atmosphere. The results of XRD and Raman spectroscopy showed the presence of anatase TiO2 phase and T-Nb2O5 phase with orthorhombic structure in the pure TiO2 and Nb2O5 oxides, respectively. The Nb2O5 oxides doped with TiO2 presented a T-Nb2O5 phase, but there was no formation of TiNb2O7. TiO2 anatase was observed in the mixed oxide with higher Ti content (5 wt% TiO2). A zeta potential analysis showed positive surface charge values for titanium oxide and negative for niobium oxide and mixed oxides. The addition of up to 5 wt% of the TiO2 fold the activity of Nb2O5 in the discoloration of both dyes. Pure TiO2 exhibits higher initial activity, which could be related to its positive PZC and higher attraction to sulphonic groups present in the dyes. Despite of the lower initial rate, 2.5 and 5% TiNb catalysts achieved full degradation of the dyes after 4 h of reaction.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Date de dépôt :
2022-03-02T07:14:49Z
2024-02-05T16:32:40Z
2024-02-05T16:32:40Z