Mohamed Saad

Among the environmental issues, plastic waste is one of the most significant problems, and thus, searching for ways to solve it is critical. In the present work, a green process is proposed for synthesizing RGO nanosheets from recycled plastic waste for efficient supercapacitor applications. The suggested approach consists of the transformation of plastic waste into GO using a direct and reproducible strategy and then the transformation of GO to RGO via an eco-friendly reducing agent. The synthesized RGO nanosheets possessed desirable electrochemical characteristics such as a specific capacitance of 104[ ]F/g at 0.5[ ]A/g, 90% capacitance retention after 5000 cycles, and good rate capability. The RGO nanosheets were further employed as electrode materials for the supercapacitor devices which has been evidenced with high energy density and power density. Physical properties have been characterized by XRD, Raman spectroscopy and transmission electron microscope have clearly observed the structure and the morphology of Graphene nanosheets has been established. The electrochemical properties of RGO have been examined and demonstrated to be regular. The proposed structure exhibits a nearly rectangular shape within the range of the potential window, conforming to the standard characteristics of an ideal capacitor. The findings of this study represent a viable and techno-economically feasible strategy to address the global issue of plastic waste and generate high-value graphene materials for energy storage technologies.

Zirconium dioxide nanomaterials doped with samarium were produced through a bio-template method, utilizing citric acid as a fuel. Various advanced methods, for instance, XRD, TEM, EDX, PL, XPS, and UV–Vis spectrophotometry, were employed to characterize the compositions. XRD analysis confirmed that all peaks corresponded to the tetragonal phase of ZrO₂, with no presence of impurities from other phases. The elemental composition was analyzed using EDX, verifying the presence of Zr, Sm, and O. The energy gap widening concerning the pure ZrO₂ may be the well-known Moss–Burstein shift. This shift was linked to an increase in the bandgap (from 5.25[ ]eV to 5.54[ ]eV) with increasing concentrations of Sm. This observation was made during the analysis of the photocatalysis of pure ZrO₂ and various concentrations of Sm-doped ZrO₂ for Methylene Blue. The augmentation of Sm doping resulted in an improvement in the efficiency of removing Methylene Blue, increasing the removal rate from 35% to 80%.

The nanoporous materials derived from the ZiF-8 metalorganic framework are highly interesting because of their features like good thermal stability, catalytic performance, and electric conductivity. Therefore, ZiF-derived metal oxide was utilized in several applications, for instance, energy storage and environmental remediations. Herin, we compare the as-prepared ZnO, ZiF-8, and ZnO derived from ZiF-8 in terms of structural, thermal, and morphological properties. Thus, the photocatalytic performance of all compositions. The preparation process is an effective parameter in the morphology of the sample surface. The as-synthesized ZnO had nanoparticle morphology with a size of 50–80[ ]nm. However, the ZiF-8 has cubic morphology with a long rod. The decomposition of ZiF-8 converted the sample to ZnO coated by carbon, indicating a high surface and fit morphology for photocatalysis. These results mean that ZnO derivative from ZiF-8 nanoparticles has the best efficiency for water desalination with 95%. ZnO drives from ZiF-8 demonstrated the smallest charge transfer resistance compared to that of as-prepared ZnO, and ZIF-8, coinciding with the conclusion of the EIS results. The transient photoresponses and electrochemical impedance spectra of the compounds were used further to explore the separation efficiency of the photogenerated charge carriers.