Synthesis of silver nanoparticles from oleander using a green method, and their application in enhancing photocatalytic degradation of MB with TiO2 &CuO Nanocomposite

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Abstract The tertiary composite of TiO2/CuO @ Ag (TCA) were synthesized by the solid state method using different ratios of TiO2/CuO NCs and Ag NPs. The structural, morphological, and optical properties of nanocomposites were analysed by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), Raman spectroscopy, UV–Vis diffuse reflectance spectra (UV–Vis/DRS) and Photoluminescence (PL) spectrophotometry. The results showed enhanced activity of TCA hybrid nanocrystals in oxidizing MB in water under visible light irradiation compared to pure TiO2. The photocatalytic performance TCA samples increased with suitable Ag content. The results show that the photo degradation efficiency of the TiO2 compound improved from 13% to 85% in the presence of TiO2-CuO and to 98.87% in the presence of Ag containing TiO2-CuO, which is 7.6 times higher than that of TiO2. Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal TiO2-CuO/Ag (TCA2) ratio. Reusable experiments indicated that the prepared TCA NC photo catalysts were stable during MB photodegradation and had practical applications for environmental remediation.

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