Microwave-Assisted Synthesis of CuO Nanoparticles Using Cordia africana Lam. Leaf Extract for 4-Nitrophenol Reduction

Figure 4

(a) Absorption spectra of 4-NP before and after the addition of aqueous NaBH₄ solution, (b) reduction of 4-NP with NaBH₄ but without a catalyst, (c) reduction of 4-NP with CuO but without NaBH_4, (d) reduction of 4-NP with NaBH₄ in the presence of a CuO catalyst_, and (e) plots of C_t/C₀) versus reaction time (min) for the reduction of 4-NP with and without a CuO catalyst and NBH₄.

(a)

(b)

(c)

(d)

(e)