Ecofriendly Reduction of Methylene Blue with Polyurethane Catalyst

Figure 8

Plot of ln() as a function of time (min) for reduction of MB; : reduction of MB in the presence of ascorbic acid and 0.25 g of CPUF, : reduction of MB in the presence of Citrus limon extract and ascorbic acid (50 : 50) and 0.25 g of CPUF, and : reduction of MB in the presence of Psidium guajava extract and ascorbic acid (50 : 50) and 0.25 g of CPUF.