Fig. 3. UV-vis absorption spectra for 4-NP reduction using the (a) AuNS/pulp and (b) AuNS/paper catalysts. (c) ln(Ct/C0) vs. time plot. The insets in (a) and (b) show photographs of the catalytic reaction systems in the presence of different catalysts. AuNS/pulp enabled high uniformity of catalyst distribution in solutions compared to AuNS/paper.
