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UV–vis absorption spectra for the reduction of 0.2 mM (a) 4-NP; (b) 4-NA; and (c) 2-NA in the presence of 0.2 mg of Pd/g-C3N4 as the nanocatalyst. (Inset) Absorbance vs time plot and (d) plot of ln(Ct/C0) vs time representing first-order kinetics for the reduction of nitroarenes.
