Ecofriendly Reduction of Methylene Blue with Polyurethane Catalyst

Figure 3

UV-Vis absorption spectra recorded for the progress in reduction of MB dye: (a) 2.5 mL of MB () solution and 2.5 mL of ascorbic acid () solution named as blank I, (b) 2.5 mL of MB () solution with 0.25 g of CPUF named as blank II, (c) 2.5 mL of MB () solution and 2.5 mL of ascorbic acid () solution with 0.25 g of CPUF, and (d) comparison of percent reduction of MB as a function of time in (a), (b), and (c).

(a)

(b)

(c)

(d)