Photo-catalyzed degradation of hazardous dye methyl orange by use of a composite catalyst consisting of multi-walled carbon nanotubes and titanium dioxide

► Catalytic activity of MWCNT/TiO2 has been investigated. ► The MWCNT/TiO2 composite showed better performance. ► MWCNT acts as dispersing agent preventing TiO2 from agglomeration.