Fig. 9. (a) Photographs of aqueous solutions of (1) ethyl violet, (2) 2-nitroaniline, mixture of ethyl violet and 2-nitroaniline (3) before and (4) after catalytic reduction by using graphene oxide–gold nanocomposite as catalyst. (b) UV-vis absorption spectra showing the simultaneous reduction of ethyl violet dye and 2-nitroaniline in the presence of nanocatalyst.
