Modified magnetic Nano-Biocomposite as friendly environmental catalyst for rapid degradation of organic dyes and selective aerobic oxidation of cyclohexene through advance oxidation process

To eliminate contaminated organic matter from water and wastewater, a stable, recyclable, and environmentally friendly nano-biocomposite was designed. The magnetic Fe₃O₄ nanoparticles were functionalized by SiO₂/N-<i>2</i>-(aminoethyl)-3-aminopropyl/glutaraldehyde/chitosan/Cobalt to fabricate nano-biocomposite (FS-(Am/<i>g</i>/Cs)@CoNPs). The morphological/structural identification of nano-biocomposite was carried out by ICP-OES, DR-UV, XRD, FE-SEM, TEM, HR-TEM, BET, EDX, FT-IR, TGA, and VSM techniques. The catalytic performance of this heterogeneous catalyst was studied in the degradation of organic dyes including methylene blue, methyl orange, methylene violet, and Bisphenol A, and efficiency was achieved at 99.3 % (<i>k</i> _obs = 0.3703 min^-1), 97.4 % (<i>k</i> _obs = 0.3627 min^-1), 93.6 % (<i>k</i> _obs = 0.228 min^-1) and 98.8 % (<i>k</i> _obs = 0.459 min^-1) after 12-14 min at room temperature in pH = 7.0, respectively. The reaction proceeded through the activation of Co²⁺/Co³⁺ which occurs on the surface of the FS-(Am/g/Cs)@CoNP by the PMS/O₂ system through recombination of SO₄ ^•- and OH^•. Furthermore, selective allylic oxidations of cyclohexene to cyclohexenone (TOF = 4583.7 h^-1, 100 % selectivity, 98 % conversion) were done by this nano-biocomposite.