Fig. 13. UV-visible spectra for the reduction of methylene blue (a) with NaBH4 in the absence of catalyst. (b) In the presence of catalyst without NaBH4. (c) With NaBH4 in the presence of catalyst. (d) Plot of ln(At/Ao) vs. time. Reaction conditions: 1.6 × 10−4 M methylene blue = 40 mL, 0.04 M NaBH4 = 0.0968 g, catalyst = 400 μL.
