In this work, HNbxTa1-xWO6 (x=0, 0.3, 0.5, 1) nanosheets were successfully synthesized by an in-suit doping strategy at the molecular level and an exfoliation-restacking process. The crystal phase structures, surface morphologies, and chemical components of the obtained HNbxTa1-xWO6 nanosheets were systematically characterized by X-ray diffraction patterns, laser Raman spectroscopy, scanning electron microscopy, ultraviolet–visible diffuse reflectance spectroscopy and N2 adsorption-desorption measurements. The adsorption and photocatalytic degradation of RhB aqueous solution under dark and simulated sunlight irradiation were investigated, respectively. The adsorption results demonstrated that the large total pore volume and strong acidity are favorable for the adsorption of RhB, and the photocatalytic results showed that the introduction of Ta element greatly improved the photocatalytic activities of the as-prepared HNbxTa1-xWO6 nanosheets. Among the HNbxTa1-xWO6 nanosheets, HTaWO6 nanosheet has the highest photocatalytic activity for RhB degradation with a rate constant of 1.62×10−2 min−1. According to the photocatalytic result, it can be concluded that the use of in-suit doping to control the energy band structure is an effective method for designing efficient photocatalysts.

中文翻译：

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HNbWO6 纳米片中的合适掺杂 Ta 元素可增强光催化性能

在这项工作中，HNbxTa1-xWO6 (x=0, 0.3, 0.5, 1) 纳米片通过分子水平的合适掺杂策略和剥离-重堆叠过程成功合成。通过X射线衍射图、激光拉曼光谱、扫描电子显微镜、紫外可见漫反射光谱和N2吸附-脱附测量系统地表征了所获得的HNbxTa1-xWO6纳米片的晶相结构、表面形貌和化学成分。分别研究了RhB水溶液在暗光和模拟太阳光照射下的吸附和光催化降解情况。吸附结果表明，大的总孔容和强酸性有利于RhB的吸附，光催化结果表明，Ta元素的引入大大提高了所制备的HNbxTa1-xWO6纳米片的光催化活性。在HNbxTa1-xWO6纳米片中，HTaWO6纳米片对RhB降解具有最高的光催化活性，速率常数为1.62×10−2 min−1。根据光催化结果可以得出结论，利用适当掺杂来控制能带结构是设计高效光催化剂的有效方法。