Ti/Fe₂O₃ (Ti/Fe mass ratio ∼ 0.22) magnetic catalysts were prepared by a modified Pechini method and evaluated for heterogeneous photo-Fenton-like process for degradation of Reactive Black 5 (RB5) textile dye under artificial solar light irradiation. Catalysts were calcined at temperatures of 500–700 °C, and were characterized by TGA, XRD, N₂ adsorption/desorption, FTIR, SEM, EDX and UV/Vis DRS analyses. The photo-Fenton experiments were conducted at pH 2.5, H₂O₂ initial concentration of 12 mmol L⁻¹ and 0.40 g L⁻¹ of catalyst. Results showed that catalyst calcined at 500 °C (TiFeO-500) achieved 100 % degradation of textile dye, the highest photoactivity, when compared with the materials calcined at either 600 or 700 °C and to the pure oxides α−Fe₂O₃ or TiO₂, under the same conditions. Kinetic data related to RB5 dye degradation with TiFeO-500 catalyst was well fitted to the pseudo-first order model with initial reaction rate of 0.28 mg L⁻¹ min⁻¹. The high catalytic activity of this material was favored by its multiple bandgap from UV to visible range, as well as to its nanometric particle size and low agglomeration. Photoreduction efficiency of the Fe³⁺ to Fe²⁺ was favored by the synergy with Ti⁴⁺ and possible amorphous Fe and Ti oxysulfate species in the photo-Fenton like process for the production of hydroxyl radical (•OH) and dye degradation.

通过改进的Pechini方法制备了Ti / Fe ₂ O ₃（Ti / Fe质量比约为0.22）磁性催化剂，并评估了其在人工太阳光照射下的非均相光芬顿样降解活性黑5（RB5）纺织染料的性能。 。催化剂在500–700°C的温度下煅烧，并通过TGA，XRD，N ₂吸附/解吸，FTIR，SEM，EDX和UV / Vis DRS分析进行表征。光芬顿实验在pH 2.5，H ₂ O ₂初始浓度为12 mmol L ^-1和0.40 g L ^{-1的条件下进行}催化剂。结果表明，催化剂在500℃（TiFeO-500）煅烧取得了纺织染料，最高的光活性，在任600或700℃，并于纯氧化物煅烧的材料相比时的α-Fe的100％的降解₂ ö ₃或TiO ₂在相同条件下。与TiFeO-500催化剂降解RB5染料有关的动力学数据很好地拟合了拟一级反应模型，初始反应速率为0.28 mg L ^-1 min ^-1。该材料的高催化活性受到其从紫外线到可见光范围的多个能带隙，纳米粒度和低团聚的青睐。Fe ³⁺对Fe ^2+的光还原效率与Ti ⁴⁺的协同作用以及在光芬顿样过程中可能的无定形Fe和硫酸氧钛物种的协同作用有利于羟基自由基（•OH）的产生和染料的降解。