The photocatalytic activity of the undoped and Gadolinium-doped MTiO₃ perovskites (M = Co, Cu, and Ni) was investigated via degradation of methylene blue as a model organic pollutant under Xenon lamp as a visible light source. For this object, undoped and Gd-doped MTiO₃ (M = Ni and Cu) perovskites were synthesized through the facile Pechini method, and an ethylene glycol-mediated route was used for the synthesis of undoped and Gd-doped CoTiO₃. Synthesized perovskites were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), N₂ adsorption/desorption and photoluminescence (PL) analysis. The results indicated that the photocatalytic activity of the MTiO₃ perovskites (M = Co, Cu, and Ni) was improved by introducing 2% of Gd³⁺ ions into crystallite lattice of perovskites. The observed improvement can be attributed to the size decrease of perovskites, specific surface area enhancement, and decrement in the recombination rate of photogenerated electrons and holes resulted from doping Gd ions. 2% Gd-doped NiTiO₃ represented the best photocatalytic activity. Moreover, the results demonstrated that methylene blue molecules are mainly degraded by photogenerated holes and superoxide anion radicals.

在氙灯作为可见光光源下，通过降解作为模型有机污染物的亚甲基蓝，研究了未掺杂和Ga掺杂的MTiO ₃钙钛矿（M = Co，Cu和Ni）的光催化活性。为此，通过简便的Pechini方法合成了未掺杂和掺Gd的MTiO ₃（M = Ni和Cu）钙钛矿，并使用乙二醇介导的路线合成了未掺杂和Gd掺杂的CoTiO ₃。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD），漫反射光谱（DRS），N ₂表征合成的钙钛矿吸附/解吸和光致发光（PL）分析。结果表明，通过将2％的Gd ³⁺离子引入钙钛矿的晶格中，可以提高MTiO ₃钙钛矿（M = Co，Cu和Ni）的光催化活性。观察到的改善可归因于钙钛矿的尺寸减小，比表面积增加以及掺杂Gd离子导致的光生电子和空穴的复合率降低。2％掺Gd的NiTiO ₃表现出最好的光催化活性。此外，结果表明，亚甲基蓝分子主要被光生空穴和超氧阴离子自由基降解。