Figure 8

(A)Time dependent UV-vis absorption spectra for the reduction of 4-NP by NaBH4 to 4-AP for a time period of 5 min in the presence of biosynthesized gold nanoparticles of different shapes and sizes (a) G10.250.9.24.30 (b) G10.250.5.24.30 (c) G10.250.7.72.40 (d) G10.500.9.72.40 (e) G10.250.7.72.20; (B). Plots of ln(Ct/C0) vs Time for the reduction of 4-NP by NaBH4 to 4- AP in the presence of biosynthesized gold nanoparticles of different shapes and sizes (a) G10.250.9.24.30 (b) G10.250.5.24.30 (c) G10.250.7.72.40 (d) G10.500.9.72.40 (e) G10.250.7.72.20 (f) control without addition of gold nanoparticles.