Photoelectrocatalysis Response with Synthetic Mn-N-TiO2/Ti Electrode for Removal of Rhodamine B Dye

The photoelectrocatalytic (PEC) degradation of rhodamine B (RhB) organic dye using manganese (Mn)-nitrogen (N) doped titanium oxide (TiO2) electrode was investigated under two applied electrochemical modes such as cyclic voltammetry (CV) and linear-sweep voltammetry (LSV). The synergetic effect between light variation and photocurrent response demonstrated that the TiO2 thin films were active under the ultraviolet (UV) light illumination with a photocurrent value (I-pa) of 2.65 mu A; meanwhile, the Mn-N-TiO2 was periodically activated under visible (Vis) light illumination with I-pa of 3.63 mu A. In addition, the photolysis was evaluated to compare the degradation effect under varying light illuminations without catalyst with the PEC system. The good ability of TiO2 to degrade RhB under UV light was found with a percentage degradation value at 0.5 mg L-1 of 63%. In comparison, the Mn-N-TiO2 was activated under Vis light with 0.5 mg L-1 of 74.2%.

Automated summary

This study investigated the photoelectrocatalytic degradation of rhodamine B organic dye using manganese-nitrogen doped titanium oxide electrode under different light illuminations. The results showed that TiO2 exhibited good degradation ability under UV light, while Mn-N-TiO2 showed better degradation performance under visible light illumination.