Noble metal modified titania catalysts in the degradation of reactive black 5: a kinetic approach.
The photocatalytic degradation of Reactive Black 5 (RB 5), a di-azo dye was investigated over M/TiO2 (M = Ag, Au and Pt) photocatalysts irradiated with UV and visible light. TiO2 was prepared by sol-gel technique (Syn-TiO2). Photodeposition of metal salt precursors over Syn-TiO2 was carried out so as to obtain 1 wt% of M/TiO2 catalysts. The photodecolourization and photodegradation reactions were also compared with commercial TiO2 (Degussa P25) catalyst. Kinetic studies for the decolourization of RB 5 showed that it followed pseudo first order. Recycling of catalysts was performed to check the economic feasibility of the photocatalytic process. In order to check the applicability of M/TiO2 catalyst in the treatment of industrial effluent, real textile effluent was collected from an industry and subjected to photodegradation and the results are presented. Enhanced activity of M/TiO2 catalyst under visible light irradiation highlights its importance in the field of photocatalysis.
Catalysis Laboratory, Department of Chemical Engineering, Alagappa College of Technology, Anna University, Chennai 600 025, Tamilnadu, India.
A Valentine
AV
Rupa
R
R
Vaithiyanathan
T
T
Sivakumar
D002384:Catalysis; D008670:Metals / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010777:Photochemistry; D010782:Photolysis; D014025:Titanium / Q000737:chemistry*
D008670:Metals; D009282:Naphthalenesulfonates; C009495:titanium dioxide; D014025:Titanium; C063421:Remazol black B