Solar-light-driven LaFe(x)Ni(1−)(x)O(3) perovskite oxides for photocatalytic Fenton-like reaction to degrade organic pollutants

LaFe(x)Ni(1−)(x)O(3) perovskite oxides were prepared by the sol–gel method under various conditions, including different pH values (pH 0 and pH 7) and different calcination temperatures (500–800 °C) as well as different Fe/Ni ratios (1/9, 3/7, 5/5, 7/3, 9/1). The samples were examined by XRD, DRS, BET, and SEM to reveal their crystallinity, light-absorption ability, specific surface area, and surface features, respectively. The photocatalytic Fenton reaction was conducted using various LaFe(x)Ni(1−)(x)O(3) perovskite oxides to decompose the methylene blue molecules. Accordingly, the synthesis condition of pH 0, calcination temperature at 700 °C, and Fe/Ni ratio = 7/3 could form LaFe(0.7)Ni(0.3)O(3) perovskite oxides as highly efficient photocatalysts. Moreover, various conditions during the photocatalytic degradation were verified, such as pH value, catalyst dosage, and the additional amount of H(2)O(2). LaFe(0.7)Ni(0.3)O(3) perovskite oxides could operate efficiently under pH 3.5, catalyst dosage of 50 mg/150 mL, and H(2)O(2) concentration of 133 ppm to decompose the MB dye in the 1st order kinetic rate constant of 0.0506 s(−1).