Biologically mediated synthesis of CuO nanoparticles using corn COB (Zea mays) ash for photocatalytic hydrogen production

Mesoporous CuO Prepared in a Natural Deep Eutectic Solvent Medium for Effective Photodegradation of Rhodamine B

“…The results listed in Table 1 indicate that the crystallite sizes of the synthesized CuO NPs are in the range of 8.3 nm to 15.8 nm, confirming the nanocrystalline nature of the synthesized CuO. The lattice strain values of the synthesized CuO NPs are in the range of 6.1 × 10 −3 to 8.3 × 10 −3 , which are also close to those of the CuO NPs reported in literature (8.0 × 10 −3 ) [ 21 ].…”

“…The optical properties of the synthesized CuO NPs were investigated via UV-Vis diffuse reflectance spectroscopy, and the results shown in Figure 5 a and Figures S15–S21 in the Supplementary Materials suggest that the synthesized CuO NPs have good absorption in the visible region; their band gap energy values ( E g , Figure 5 b and Figures S15–S21 ) estimated using Tauc equation (Equation (3)) are in the range of 1.40 eV to 2.47 eV, and are consistent with the reported E g values of CuO NPs [ 3 , 20 , 21 , 22 , 23 ]. ( a h v ) 2 = K (h v − E g ) where K, E g , a ,and h v refer to the constant, the band gap energy, the absorption coefficient, and the photon energy, respectively.…”

“…89-2529; a = 4.7 Å, b = 3.4 Å, c = 5.1 Å [ 20 ]). The lattice strains ( ε ) and average crystallite sizes ( D ) of the synthesized CuO were calculated using the following equations [ 20 , 21 ]. Ε = β /(4 tan θ ) D = (0.9λ)/( β cos θ ) where β , λ, and θ are the full width athalf maximum (FWHM) of the diffraction peak, the X-ray wavelength (1.5406 Å), and Bragg’s diffraction angle, respectively.…”

“…The structural characteristics of the CuO NPs synthesized under different conditions (Table 1) were investigated, and their X-ray diffraction (XRD) patterns illustrated in [20]). The lattice strains (ε) and average crystallite sizes (D) of the synthesized CuO were calculated using the following equations [20,21].…”

“…89-2529; a = 4.7 Å, b = 3.4 Å, c = 5.1 Å [20]). The lattice strains (ε) and average crystallite sizes (D) of the synthesized CuO were calculated using the following equations [20,21].…”