In this work, CeO₂‐TiO₂ heterostructures were submitted to the microwave‐assisted hydrothermal (MAH) method at 140°C for 30 minute, and varying the CeO₂ and TiO₂ percentages as 10, 30, and 50 mol%. The heterostructures were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer‐Emmett‐Teller methodology (BET), and UV‐Vis diffuse reflectance spectroscopy (UV‐Vis). The photocatalytic properties were estimated varying the concentration of methylene blue (MB) dye. The diffractograms indicate the formation of TiO₂ anatase and CeO₂ phases, without the formation of secondary phases. TEM images indicate the formation of nanocubes and nanospheres for CeO₂ and TiO₂, respectively. BET analysis indicates that CeO₂ has the largest surface area (62.80 m².g⁻¹), and TiO₂‐10%CeO₂ heterostructure has a low surface area (26.13 m².g⁻¹). The addition of TiO₂ to CeO₂ increases the photocatalytic activity from 32% to 80% for CeO₂ and CeO₂‐50%TiO₂, respectively. In contrast, the addition of CeO₂ significantly decreases the photocatalytic activity of TiO₂ from 98.9% to 50% for TiO₂ and TiO₂‐50%CeO₂, respectively. Reuse tests showed that the TiO₂‐xCeO₂ samples maintain the photocatalytic response in subsequent cycles while the CeO₂‐xTiO₂ samples have an increase in the response.

中文翻译：

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MAH获得的CeO2-xTiO2和TiO2-xCeO2（x = 10、30和50 mol％）异质结构的光催化性能

在这项工作中，CeO ₂ -TiO ₂异质结构在140°C下经受了微波辅助水热（MAH）方法的作用，时间为30分钟，并且CeO ₂和TiO _2的百分含量分别为10、30和50 mol％。通过X射线衍射（XRD），透射电子显微镜（TEM），Brunauer-Emmett-Teller方法（BET）和UV-Vis漫反射光谱（UV-Vis）表征了异质结构。通过改变亚甲基蓝（MB）染料的浓度估算光催化性能。衍射图表明TiO ₂锐钛矿相和CeO ₂相的形成，而没有第二相的形成。TEM图像表明CeO的纳米立方体和纳米球的形成₂和TiO ₂。BET分析表明，CeO ₂具有最大的表面积（62.80 m ² .g ^-1），而TiO ₂ -10％CeO _2的异质结构具有较低的表面积（26.13 m ² .g ^-1）。TiO 2的加入₂到的CeO ₂的增加的光催化活性，从32％到80％的CeO为₂和的CeO ₂ -50％的TiO ₂分别。与此相反，在添加的CeO ₂显著降低TiO 2的光催化活性₂从98.9％的TiO为50％₂和TiO ₂ -50％的CeO ₂分别。重复使用测试表明，TiO ₂ -xCeO ₂样品在随后的循环中保持光催化响应，而CeO ₂ -xTiO ₂样品的响应增加。