Figure 6

(a,b) Time-dependent UV-vis spectral changes of the reaction mixture catalysed by Au@hmC-FeCo/GCs for 4-nitrophenol (a) and 4-nitrotoluene (b). (c,d) Plot of ln (C₀/C_t) versus reaction time for each nanocatalyst for the reduction reactions of 4-nitrophenol (c) and 4-nitrotoluene (d).