Theobroma cacao pod shells extract mediated production of FeO nanoparticles to explore nanoadsorbent, nanofertilizer and enzyme activator applications
摘要
Agricultural residue cocoa pod shells are available abundantly and pose a disposal challenge. The current study addresses the issue by channelizing cocoa pod shells as a sustainable resource for the synthesis of FeO nanoparticles to enhance the value addition to agricultural residue. Various analytical techniques, including X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and UV-visible spectrophotometry, were employed to characterize the synthesized iron oxide nanoparticles. The surface plasmon resonance spectrum obtained from the UV Vis spectrophotometer confirms the synthesis of FeO nanoparticles. SEM analysis indicated that the particles were in spherical shape with diameters ranging between 52.79 and 101.5 nm. XRD results showed an average crystallite size of 46.79 nm for the crystalline FeO. FTIR analysis detected Fe–O vibrations and carbonyl groups, confirming successful synthesis and capping. The iron oxide nanoparticles exhibited a pseudo second order kinetic during dye removal through the adsorption of a 30 mg load with R2 of 0.99. Adsorption of crystal violet dye on FeO nanoparticles followed Langmuir isotherm. Colloidal FeO nanoparticles resulted in an eight-fold increase in amylase activity in comparsion with the control. The shoot and root elongation of Vigna radiata and Eleusine coracana were significantly enhanced due to the presence of FeO nanoparticles, in comparison with the control. This investigation successfully utilized cocoa pod shells in the eco-friendly synthesis of FeO nanoparticles, revealing significant potential applications in agriculture, enzymology, and environmental remediation.