Hierarchical nanostructures with appropriate morphology and surface functionalities are highly desired to achieve an optimized electrochemical property for active electrode materials. This work renders the facile hydrothermal synthesis of CdO, SnO2, and CdO-SnO2 nanocomposite, and their capacitive performance was tested. The formation of the pure samples and their composite was committed by low-temperature Raman spectroscopy and x-ray diffraction studies which revealed the tetragonal and cubic structures of CdO and SnO2 powder samples with good crystallinity and purity. The morphological postmortem reveals the formation of nanoparticles morphology of CdO with a highly smooth surface appearance. Besides, the SnO2 illustrates the morphology of the micro flowers composed of ultrathin nanosheets. More specifically, the electrochemical properties indicate the pseudocapacitive charge storage mechanism based on cyclic voltammetry and chronopotentiometry analysis. The CdO-SnO2 composite electrode displayed a higher capacitance due to additional pores/space offered for active sites and continuously allowed electrolyte ions to interact with the inner/outer surface of the electrode. These exciting findings led us to design and fabricate battery hybrid supercapacitors (BHSC) from CdO-SnO2, and activated carbon (AC), referred to as CdO-SnO2//AC BHSC, attains a high power delivery (5717 W/kg), and a maximum energy density of 42 Wh/kg at low discharge rate. Noteworthy, a stable cycling performance was obtained with only 91.3% retention after 8000 cycling at a large discharge current of 10 A/g, denoting the magnificent durability of the active electrode material.

Current study focuses on the utilization of non-edible oil seeds of Cannabis sativa as an economical feedstock for synthesizing high quality biodiesel using novel, green and extremely reactive tungsten oxide (WO3) nano catalyst. The as synthesized green nanoparticles (NPs) were examined using Fourier-transform infrared spec-troscopy (FT-IR), X-ray Diffraction (XRD), energy diffraction X-ray (EDX) and scanning electron microscopy (SEM). Results showed that WO3 has spherical crystal structure with a diameter of 45 nm. Highest biodiesel yield (91 wt%) was achieved under dynamic conditions i.e., 2 wt% catalyst, 1:7 oil to methanol molar ratio, 80 degrees C reaction temperature for 120 min. The reaction conditions were optimized via Response Surface Methodology. WO3 NPs showed catalytic stability up to five rounds. The fuel characteristics of biodiesel met the values set by international standards. Non-edible Cannabis sativa seed oil and novel green WO3 nano-catalyst are economical choices to assist the sustainable growth of biodiesel industry.

In this work, nanocomposites of hexagon shaped Fe2O3 decorating few layered graphene sheets was prepared as an effective and stable heterogeneous Fenton catalyst for the efficient degradation of methylene blue (MB) dye the degradation capability of the prepared. The results indicated that the fast removal of dyes follow second order kinetics with high correlation coefficient values (r2 > 0.95). The plausible reaction process for better understanding the nature of reactive oxidation species involved in the Fenton reaction were also presented. The exceptional degrading ability and adsorption of nanocomposites substantiated their potential for wastewater remediation.

The innovation and development of water purification methods have been at the center of extensive research for several decades. Many nanoparticles are frequently seen in industrial waste water. In this research, zinc oxide nanoparticles (ZnO) were synthesized following an autocombustion method with and without honey capping. Structural crystallinity and bonding structure were examined via X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectroscopy. Optical behavior was analyzed using ultraviolet–visible (UV–Vis) spectroscopy and photoluminescence (PL). Size estimation and surface morphology were studied using scanning electron microscopy (SEM), while energy-dispersive spectroscopy (EDS) was performed to analyze the sample purity and elemental composition. The photocatalytic degradation of methylene blue (MB) by ZnO was assessed as it is an efficient water treatment process with high potential. The biological activity of ZnO nanoparticles was also investigated in terms of antibacterial and antifungal activities against different bacterial and fungal species. Surprisingly, the as-synthesized ZnO nanoparticles were found to be substantially bioactive compared to conventional drugs. Honey-mediated nanoparticles displayed 86% dye degradation efficiency, and that of bare ZnO was 60%. Therefore, the involvement of honey in the synthesis of ZnO nanoparticles has great potential due to its dual applicability in both biological and environmental remediation processes.