Synthesis and Characterization of Dy₂O₃@TiO₂ Nanocomposites for Enhanced Photocatalytic and Electrocatalytic Applications

Abstract

Industrial wastewater pollution is a crucial global issue due to the increasing need for clean water. Traditional photocatalytic methods for eliminating harmful dyes are often ineffective and are environmentally damaging. This study introduces a new, efficient photocatalyst combining Dy 2 O 3 with TiO 2 using a single-step hydrothermal approach. Dy 2 O 3 @TiO 2 nanostructures were synthesized and characterized by using XRD, SEM, EDS, TEM, BET, and UV−visible spectroscopy. Dy 2 O 3 was evenly distributed on TiO 2 , preventing clumping and resulting in a larger surface area with more active sites. UV irradiation (365 nm) replaced the traditional thermal energy for photocatalytic dye breakdown, leveraging the varying conductivity of the Dy 2 O 3 @TiO 2 nanocomposites. Incorporating Dy 2 O 3 decreased band gaps, enhancing redox reactions and expanding the range of degradable contaminants. For Rhodamine B dye degradation, the Dy 2 O 3 @TiO 2 composite demonstrated significantly higher degradation rates than Dy 2 O 3 or TiO 2 alone at reaction parameters such as neutral pH (pH 7) and catalyst concentration (2 g L −1 ). The hybrid material also demonstrated improved electrocatalytic activity in oxygen reduction reactions (ORRs) under alkaline conditions with an initial potential of 0.88 V and a Tafel slope of 73 mV dec −1 . The enhanced catalytic activity and durability are attributed to the synergistic interaction between Dy 2 O 3 and TiO 2 . This novel photocatalyst offers a sustainable alternative for treating industrial effluents while reducing the environmental impact.