Impact of Heat Treatment on the Structural, Optical, Magnetic and Photocatalytic Properties of Nickel Oxide Nanoparticles

Key Points

• Maximum photocatalytic activity of 72.4% was achieved by nickel oxide nanoparticles annealed at 450 °C, indicating strong degradation potential for MB dye.
• High annealing temperatures lead to a decrease in both energy gap values and the presence of ferromagnetic properties in nickel oxide nanoparticles.
• Characterization involved various techniques, including XRD, TEM, and UV-VIS absorption spectroscopy, for comprehensive property analysis and understanding of the materials created from annealing process changes in temperature and conditions at 210 to 450 °C in totality over different spectra ranges—leading to differing chemical and physical responses in nanoparticles produced from precursor materials based on varying conditions compared to other methods or processes previously reported in literature in several cases noted across the board until now from different perspectives as seen here overall in approach from this area of study as detailed herein overall where specialized analysis was performed and shown clearly over time until now leading to clarity around various points made. Specific behaviors are closely linked to the annealing process, demonstrating a clear impact on their functional characteristics in a clear way from this overall framework or design seen across the board as also reported in other comparative analysis from literature before with clarity here as noted overall based. Additional analysis further indicates that high annealing promotes photocatalytic degradation of methylene blue through mechanisms influenced by structural and magnetic changes in the nanoparticles produced from these processes—demonstrating how these improvements can offer pathways to refined material applications in energy and environmental science contexts overall moving forward from insights gathered here to capitalize on as necessary.