Search

Aegle marmelos(AM), commonly known as bael fruit, is a medicinal plant that has been used for centuries in traditional Indian medicine. In this work, the predictive capabilities of response surface methodology (RSM) and artificial neural networks (ANN) using MATLAB in modeling brass corrosion inhibition by AM pulp extract in acidic environment (1M H2SO4) were comparatively analyzed. The RSM studies measured the corrosion rate of brass in a 1M H2SO4solution under different conditions, i.e., time, temperature, and the concentration of AM extract. The maximum inhibition efficiency was achieved at a time period of 24.72 h, 600 ppm of AM pulp extract concentration, and a temperature of 25.8°C. The UV studies showed that AM pulp extract adsorbed on the surface of brass, forming a protective layer that prevented the metal from corroding. The SEM images showed that the surface of brass in the presence of AM pulp extract was smoother than that of brass in the absence of AM pulp extract. The AFM images showed that the roughness of brass in the presence of AM pulp extract was lower than that of brass in the absence of AM pulp extract. The FTIR spectra showed that the absorption bands of the metal oxide on the surface of brass were weakened in the presence of AM pulp extract, indicating that the formation of metal oxide was inhibited. The results of this study suggest that AM pulp extract is an effective and eco-friendly corrosion inhibitor for brass in acidic environment. The study also provides insights into the mechanism of corrosion inhibition by AM pulp extract.

• Spirulinapretreated with Ethanol had a maximum bio-oil production of 56.1 wt %.

The present study uses a bio-waste, i.e., skin of Allium cepa, for green synthesis of zinc oxide nanoparticles. The nanoparticles A. cepa-ZnONP were tested for their photo catalytic degradation efficacy toward harmful dyes. Additionally, the anti-bacterial properties of A. cepa-ZnONP were evaluated against four organisms, namely Escherichia coli(EC), Pseudomonas aeruginosa(PA), Bacillus cereus(BC), and Staphylococcus aureus(SA). The synthesized A. cepa-ZnONP was characterized with scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM–EDX), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) methods. The A. cepa-ZnONP demonstrated efficient degradation of Crystal Violet (CV), Rhodamine B (RB), and Methylene blue (MB) dyes, achieving maximum degradation percentages of 99.21%, 95.63%, and 92.34%, respectively, while operating under optimal process conditions. The rate constant values for CV, RB, and MB dyes at a temperature of 328 K were determined to be 0.1063, 0.0758, and 0.0447 min−1, respectively. The activation energy values for CV, RB, and MB dyes were determined to be 12.28, 18.437, and 50.623 kJ/mol, respectively. The successful regeneration of photo catalytic material A. cepa-ZnONP is a crucial milestone in guaranteeing their long-term effectiveness and practical usability. This work also emphasizes the possible uses of A. cepa-ZnONP in environmental remediation. This demonstrates the wide range of applications and importance of this substance in addressing current problems.