Abstract
Abstract The photocatalytic decolourisation and degradation of an azo dye reactive orange 4 (RO4) in aqueous solution with TiO 2 -P25 (Degussa) as photocatalyst in slurry form have been investigated using solarlight. There is a significant difference in adsorption of dye on TiO 2 surface with the change in solution pH. The effect of various photocatalysts such as TiO 2 -P25, TiO 2 (anatase), ZnO, CdS, Fe 2 O 3 , SnO 2 on the decolourisation and degradation has been studied. The order of reactivity of photocatalysts is TiO 2 -P25>ZnO>TiO 2 (anatase). CdS, Fe 2 O 3 and SnO 2 have negligible activity on RO4 decolourisation and degradation. The effects of various parameters such as catalyst loading, pH and initial concentration of the dye on decolourisation and degradation have been determined. The degradation was strongly enhanced in the presence of electron acceptors such as H 2 O 2 , (NH 4 ) 2 S 2 O 8 and KBrO 3 . The effects of dye-assisting chemicals such as Na 2 CO 3 , NaCl have been carried out. Addition of these chemicals inhibits the removal rate. The photodecolourisation and degradation kinetics are discussed in terms of Langmuir–Hinshelwood kinetic model.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
