Synthesis of Nickel Oxide Nanoparticles and Copper-Doped Nickel Oxide Nanocomposites Using Phytolacca dodecandra L’Herit Leaf Extract and Evaluation of Its Antioxidant and Photocatalytic Activities

Abstract

Nanotechnology research is emerging as cutting-edge technology, and nanoparticles (NPs) and nanocomposites (NCs) have played a significant role in the bioremediation and treatment of polluted water by organic and nonorganic materials. Nanoparticles produced by plant extracts are more stable and biocompatible in comparison with those produced by physical and chemical methods. This research focuses on the synthesis of NiO NPs and Cu–NiO NCs using Phytolacca dodecandra L’Herit (P.d) leaf extract and evaluation of their antioxidant and photocatalytic activities. Cu–NiO NCs were synthesized using 50 mL of 0.1 M nickel(II) nitrate hexahydrate, 10 mL of 0.1 M copper(II) nitrate trihydrate, and 20 mL of leaf extract. The synthesized nanoparticles were characterized by UV–vis, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) analyses to study the energy band gap, average crystallite size, functional groups, and morphology of the samples, respectively. The UV–vis analysis showed a red shift after copper doping, indicating a decrease in the optical band gap values. FT-IR characterization confirms the presence of various functional groups in samples. Crystallite sizes of the formed particles were obtained to be 14.18 and 16.10 nm from the XRD data for NiO NPs and Cu–NiO NCs, respectively. SEM showed the crystallinity of particles with a cubic structure. The photocatalytic degradation of methylene blue (MB) was found to be 78.3 and 97.8% by NiO NPs and Cu–NiO NCs, respectively. In the antioxidant test, NiO NPs and Cu–NiO NCs prevented the oxidation of 50% of the H2O2 molecules at a concentration of 363.96 and 350.29 μg/mL, respectively. Finally, the synthesized samples showed good photocatalytic and antioxidant activities.

Kei-apple-mediated NiO nanoparticles and biological studies: anti-inflammatory and cytotoxicity study against HeLa and HEK 293 cell lines

“…Notably, no additional peaks were observed in the pattern, indicating the high purity of the nanoparticles. The obtained indexed peak pattern matched well with the standard pattern (JCPDS # 96-101-0096) for NiO as already established in literature [26]. The reflections were indexed to the face-cantered cubic NiO phase, which is consistent with previously reported works in the literature.…”

Photocatalytic and Antimicrobial Properties of ZnO and Mg-Doped ZnO Nanoparticles Synthesized Using Lupinus albus Leaf Extract

“…The degradation of MB dye is characterized by a gradual change in the color of the dye solution from blue to colorless along with a continuous decrease in MB absorption as the irradiation time increases (Figure ). This observation is consistent with previous studies on the photodegradation of MB by ZnO and metal-doped ZnO NPs . The degradation of MB dye was also studied in the presence of sunlight in the absence of catalysts.…”

“…The detailed procedures can be found elsewhere in the literature. 14,15 2.4. Synthesis of ZnO and Mg-Doped ZnO Nanoparticles.…”

Synthesis of mint leaf extract and mint-leaf-based NiO nanoparticles, coating of extract layers without and with NiO nanoparticles on copper through drop-casting, and their analysis for the corrosion prevention in saline water

“…However, a peak at 452 cm −1 was noticed (which was absent in the CEML spectrum) that could be assigned to the NiO NP vibration. 49…”

“…However, a peak at 452 cm À1 was noticed (which was absent in the CEML spectrum) that could be assigned to the NiO NP vibration. 49 This fact suggested that the Cu became more corrosion resistant after CEML coating. 50 The maximum shift in OCP was observed for two layers of CEML, which could indicate that two layers of CEML offered the maximum corrosion resistance to Cu.…”