MoO3 and reduced molybdenum oxides (MoOx, x=2.87 and 2) were successfully synthesized through a one-pot hydrothermal method without and with adding polymeric surfactants (PVP or PVA) as capping and reducing agents into the reaction solution. The synthesized nanostructures were characterized by different techniques. Adding polymeric surfactants into hydrothermal reaction solution had significant effect on the structural, optical and morphological properties of products. Orthorhombic phase of MoO3 nanorods, monoclinic phase of MoO2.87 nanoparticles and monoclinic phase of MoO2 nanoparticles were obtained in the absence and in the presence of PVP and PVA, respectively. The specific surface area of MoO3, MoO2.87 and MoO2 samples calculated by the BET method was found to be 15.64, 5.94 and 87.62 m2g−1, respectively. The dye adsorption capability of products was investigated for removal of RhB molecules from water. The experimental results indicated that the RhB adsorption on MoO2 is much faster and higher than that of MoO3 and MoO2.87, which can be attributed to the larger specific surface area Furthermore, the kinetic models and isotherm models were studied to determine the adsorption rate and mechanism of RhB adsorption onto the products.

中文翻译：

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在聚合物表面活性剂的帮助下合成 MoOx 纳米结构以去除水中的染料

MoO3 和还原的钼氧化物（MoOx，x=2.87 和 2）通过一锅水热法成功合成，无需和添加聚合物表面活性剂（PVP 或 PVA）作为封端剂和还原剂到反应溶液中。合成的纳米结构通过不同的技术进行表征。在水热反应溶液中加入高分子表面活性剂对产物的结构、光学和形态性质有显着影响。分别在 PVP 和 PVA 存在和不存在的情况下获得了 MoO3 纳米棒的正交相、MoO2.87 纳米颗粒的单斜相和 MoO2 纳米颗粒的单斜相。发现通过 BET 方法计算的 MoO3、MoO2.87 和 MoO2 样品的比表面积分别为 15.64、5.94 和 87.62 m2g-1。研究了产品的染料吸附能力以从水中去除 RhB 分子。实验结果表明，RhB 在 MoO2 上的吸附速度比 MoO3 和 MoO2.87 快得多，这可以归因于更大的比表面积。此外，研究了动力学模型和等温线模型以确定吸附速率和RhB 吸附在产物上的机理。