porphyrin grafted magnetic nanopaticles as an eco-friendly, cost-effective catalyst for green oxidation of sulfides by meta-chloro peroxy benzoic acid

In this paper, meso-tetraphenylporphyrin iron(iii) chloride complex, fe(tpp)cl, supported on magnetic nanoparticles (pcmnps) was synthesized and characterized by hrtem, sem, tga, and ft-ir and vsm. the value of saturation magnetic moments of mnps and pcmnps are 68.5 and 60.3 emu/g, respectively. the sem and hrtem image were shown the uniformity and spherical-like morphology of nanoparticles with an average diameter from ∼55 to 65 and and15 ± _5 nm, respectively. the synthesized catalyst was successfully applied as a magnetically recoverable heterogeneous catalyst in oxidation of sulfides to related sulfoxides in water/ethanol as green solvents by meta-chloro peroxy benzoic acid (m-cpba). the selectivity and chemoselectivity of this clean system were attracted so much attention. no surfactants, additives, toxic reagents or organic solvents and by-product were involved. the maximum conversion and selectivity were attained at around neutral ph, which is advantageous for full-scale application. ten successive cycles of catalyst was shown that the catalyst was most strongly anchored to the magnetic nanoparticles