Nowadays, the development of new effective photocatalytic materials for the purification of real wastewaters and model systems containing organic molecules constitutes an important challenge. Here we present a preparation strategy for composite materials based on hexamolybdenum cluster complexes and exfoliated hexagonal boron nitride (h-BN) nanosheets. Cluster deposition on the nanosheet surface was achieved by impregnation of the matrix by a (Bu4N)2[{Mo6I8}(NO3)6]/acetone solution. Successful cluster immobilization and chemical composition of the samples were verified by inductively coupled plasma atomic emission spectroscopy, transmission electron microscopy with elemental mapping (TEM/EDS), X-ray photoelectron spectroscopy (XPS), and optical diffuse-reflectance spectroscopy. A small amount of water in acetone initiates the hydrolysis of a molybdenum cluster precursor with labile NO3- ligands, which are absent in the final composite, according to the XPS data. Intermediate hydrolyzed cluster forms anchor to the surface of h-BN nanosheets and promote growth of the insoluble compound [{Mo6I8}(H2O)2(OH)4]·yH2O as the final hydrolysis product. TEM/EDS proves that the cluster exists at the nanosheet surface in the form of an X-ray diffraction amorphous thin film. The samples obtained show high photocatalytic activity in the degradation of a model pollutant rhodamine B under UV- and visible-light irradiation. The materials retain their initial photocatalytic efficacy during at least six cycles without the need for recovery.

中文翻译：

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脱落的h-BN纳米片上支撑的六钼簇用于光催化水净化。

如今，开发用于净化实际废水的新型有效光催化材料和包含有机分子的模型系统构成了重要挑战。在这里，我们提出了基于六钼簇复合物和片状六方氮化硼（h-BN）纳米片的复合材料的制备策略。通过用（Bu4N）2 [{Mo6I8}（NO3）6] /丙酮溶液浸渍基质，在纳米片表面上实现簇沉积。通过电感耦合等离子体原子发射光谱，元素图谱透射电子显微镜（TEM / EDS），X射线光电子能谱（XPS）和光学漫反射光谱来验证样品的成功簇固定和化学成分。根据XPS数据，丙酮中的少量水会引发具有不稳定的NO3-配体的钼簇前体的水解，而这些NO3-配体在最终复合物中不存在。中间水解簇形成锚定在h-BN纳米片表面，并促进不溶性化合物[{Mo6I8}（H2O）2（OH）4]·yH2O的生长，这是最终的水解产物。TEM / EDS证明该簇以X射线衍射无定形薄膜的形式存在于纳米片表面。获得的样品在紫外和可见光照射下降解模型污染物若丹明B时显示出高的光催化活性。该材料在至少六个循环中保持其初始光催化功效，而无需回收。根据XPS数据。中间水解簇形成锚定在h-BN纳米片表面，并促进不溶性化合物[{Mo6I8}（H2O）2（OH）4]·yH2O的生长，这是最终的水解产物。TEM / EDS证明该簇以X射线衍射无定形薄膜的形式存在于纳米片表面。获得的样品在紫外和可见光照射下降解模型污染物若丹明B时显示出高的光催化活性。该材料在至少六个循环中保持其初始光催化功效，而无需回收。根据XPS数据。中间水解簇形成锚定在h-BN纳米片表面，并促进不溶性化合物[{Mo6I8}（H2O）2（OH）4]·yH2O的生长，这是最终的水解产物。TEM / EDS证明该簇以X射线衍射无定形薄膜的形式存在于纳米片表面。获得的样品在紫外和可见光照射下降解模型污染物若丹明B时显示出高的光催化活性。该材料在至少六个循环中保持其初始光催化功效，而无需回收。TEM / EDS证明该簇以X射线衍射无定形薄膜的形式存在于纳米片表面。获得的样品在紫外和可见光照射下降解模型污染物若丹明B时显示出高的光催化活性。该材料在至少六个循环中保持其初始光催化功效，而无需回收。TEM / EDS证明该簇以X射线衍射无定形薄膜的形式存在于纳米片表面。获得的样品在紫外和可见光照射下降解模型污染物若丹明B时显示出高的光催化活性。该材料在至少六个循环中保持其初始光催化功效，而无需回收。