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(a) Ultraviolet-visible (UV-VIS) absorption spectra of the solution before (i) and after (ii) the addition of NaBH4 and (iii) after the addition of NiPt-0.6% catalyst; (b) time-dependent UV-VIS absorption spectra of the reduction of 4-NP over the NiPt-0.6% catalyst in aqueous solution at room temperature; (c) reduction of 4-NP over different catalysts as a function of time; (d) apparent rate constants (Ka) of the reactions in the presence of supported catalysts.
