Adsorption and photocatalytic degradation of reactive brilliant red K - 2BP by TiO2/AC in bubbling fluidized bed photocatalytic reactor / Qijin Geng in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010)  

Adsorption and photocatalytic degradation of reactive brilliant red K - 2BP by TiO2/AC in bubbling fluidized bed photocatalytic reactor [texte imprimé] / Qijin Geng, Auteur ; Wenwen Cui, Auteur . - 2011 . - pp. 11321-11330.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11321-11330

Mots-clés :	Photocatalysis Photochemical reactor Catalytic Fluidized bed Fluidization Bubbling Titanium oxide degradation Adsorption
Résumé :	An activated carbon-supported titanium dioxide photocatalyst (TiO2/AC) was prepared by a spinning coating method and applied in a designed bubbling fluidized bed photocatalytic reactor (BFBPR). Adsorption and photocatalytic degradation of reactive brilliant red K-2BP in BFBPR were investigated considering the pH value, Na2SO4 added, and initial dye concentration. The experimental results indicated that the adsorption and photocatalytic degradation efficiencies of K-2BP were influenced by the pH value, Na2SO4 added, and initial dye concentration. The adsorption and photocatalytic degradation of K-2BP was approximated to the maximum value at pH value 5.7. The complex influence of Na2SO4 added on photocatalytic degradation of K-2BP at alkaline suspension was observed and explained according to the adsorption models proposed and degradation mechanism of a new free radical (SO4•−) produced. In addition, the presence of Na2SO4 plays dual functions, i.e., salt bridge-role in adsorption for Na+ and competition adsorption between anion dye molecules and SO42−, conformed by adsorption models proposed and FT-IR spectra for dye adsorption on TiO2/AC. The mass-transfer limited and screening effect that resulted from variation of the initial dye concentration may be approximated to the minimum effect at concentration of 3.75 mg L−1, with the maximum degradation efficiency above 80%. The Langmuir−Hinshelwood kinetic model was applied to explore the adsorption and degradation. Finally, the special reaction paths were inferred with variation of experimental environments.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=23437828