Photo-assisted oxidation of thiols to disulfides using cobalt Nanorust'' under visible light

Heterogeneous Nanorust'' containing cobalt oxide has been developed for the visible light assisted oxidation of thiols to disulfides using molecular oxygen as an oxidant under alkaline free conditions and therefore more environmentally friendly. Pyrolysis of heterogenized tetrasulfonated cobalt(II) phthalocyanine (CoPcS) supported on mesoporous ceria (CeO2) transforms it into a novel heterogeneous Nanorust'' containing CoOx-C,N@CeO2 which exhibited higher catalytic activity than the homogeneous CoPcS as well as the ceria immobilized CoPcS catalyst. Importantly, these catalysts could easily be recovered and recycled for several runs, which makes the process greener and cost-effective.