WITHDRAWN: Visible light assisted heterogeneous photo-Fenton-like degradation of Rhodamine B based on the Co-POM/N-TiO2 composites: Catalyst properties, photogenerated carrier transfer and degradation mechanism

Abstract

The heterogeneous photo-Fenton-like oxidation has been recognized as an effective means to degrade pollutants in water. In this paper, Co-polyoxometalate (POM) was decorated on N-TiO 2 to form the hybrid Co-POM/N-TiO 2 photo-Fentont-like catalys for the degradation of Rhodamine B (RhB) under visible light irradation. The pseudo first-order kinetic rate constant of RhB degradation in Co-POM/N-TiO 2 catalyzed heterogeneous Fenton-like reaction was 9 times higher than those of N-TiO 2 catalysts, and the degradation rate can reach to 97.47% within 40 minutes under visible light irradiation and neutral condition (at pH=7). Experimental characterizations revealed that the doping efficiently of N into TiO 2 not only expanded optical absorption of TiO 2 into the visible region, but also was beneficial for the migration of electrons from bulk to surface of TiO 2 , and further facilitated the charge transfer from TiO 2 to Co-POM clusters, resulting in the enhancement in photo-Fenton activity. Our work provides a new idea to construct the transition metal substituted POM/N-TiO 2 hybrid catalysts with Fenton-like and visible light photocatalytic activities for the practical application of environmental remediation.