Engineering Iron‐Dopped Titanium Oxide as an Efficient Electrocatalyst for Degradation of Rhodamine B

ABSTRACT Rhodamine B (RhB), as the aromatic organics is a persistent dye that is challenging to degrade and poses a significant risk of inducing drug‐resistant bacteria. Electrocatalysis has emerged as an effective method for the removal of RhB from dye wastewater. Titanium dioxide (TiO 2 ) is widely utilized in catalytic and photoelectric applications due to its high oxidation activity, excellent photoelectric performance, and straightforward preparation process. To address the issue of insufficient catalytic activity in TiO 2 ‐based electrooxidation anode materials, herein, we develop an Fe dopped TiO 2 electrocatalyst and inspect the impact of the Ti/Fe ratio on the degradation performance for RhB. The results indicate that the incorporation of Fe in TiO 2 electrocatalyst significantly enhances the capacity for generating active species OH, thereby improving the degradation performance. Specifically, under the reaction conditions of an electrolyte concentration of 1 M Na 2 SO 4 , a current density of 20 mA·cm −2 , a pH of 7, and a pollutant concentration of 5 ppm, the Fe─TiO 2 catalyst achieves a RhB degradation rate of 89%, with·OH identified as the primary active species. Compared to pure TiO 2 , the doping of Fe significantly boosts the electrocatalytic degradation efficiency of TiO 2 for RhB.