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UV–Vis spectra: (a) 3 mg Cu2O-Sb2O3, (b) 3 mg Alg@Cu2O-Sb2O3, (c) 5 mg Cu2O-Sb2O3, (d) 5 mg Alg@Cu2O-Sb2O3, (e) 10 mg Cu2O-Sb2O3, and (f) 10 mg Alg@Cu2O-Sb2O3, (g) % reduction with the required time for 2-NP reduction in the presence of NaBH4.
