Abstract

The present research article is about the visible light photocatalytic degradation of Methylene Blue (MB) by aqueous heterogeneous medium containing orthorhombic phase of nanocrystalline (NCs) molybdenum oxide (MoO₃). The two different oxidation forms of molybdenum oxides formed at annealing temperatures of 90 °C and 400 °C are Mo₁₇O₄₇ and α-MoO₃ nanocrystals which are found to exhibit good photocatalytic activity. In the present work, a simple conventional wet chemical method has been used to synthesize molybdenum oxide nanoparticles (NPs) by combining ammonium heptamolybdate tetrahydrate (AHMT) with capped sodium dodecyl sulfate (SDS) and ethanol solution. The orthorhombic phase is present in the samples annealed at 90 °C, 200 °C, 300 °C, and 400 °C, respectively, and it is found that the orthorhombic phase is a highly stable phase in both Mo₁₇O₄₇ and α-MoO₃. The photocatalytic activity of the synthesized samples is estimated by using MB degradation. The photocatalytic behaviors of the synthesized Mo₁₇O₄₇ and α-MoO₃ nanostructures have been studied using the color degradation of MB. It is found that Mo₁₇O₄₇ and α-MoO₃ with nanorods like structure has the potential to degrade the MB dye and for a time of 90 min, the degradation efficiency of Mo₁₇O₄₇ and MoO₃ are 56.15% and 95.78%, respectively.

中文翻译：

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退火温度对Mo 17 O 47和MoO 3纳米颗粒形成及其对MB染料降解的光催化性能的影响

摘要

本研究文章是关于含有纳米晶（NCs）氧化钼（MoO ₃）的正交相的水性非均相介质对亚甲基蓝（MB）的可见光光催化降解。在90退火温度形成钼氧化物℃和400℃下的两个不同的氧化形式是沫₁₇ ö ₄₇和α-的MoO ₃被发现表现出良好的光催化活性的纳米晶体。在目前的工作中，已使用一种简单的常规湿化学方法，通过将四水合七钼酸铵（AHMT）与加帽的十二烷基硫酸钠（SDS）和乙醇溶液混合来合成氧化钼纳米颗粒（NPs）。正交晶相存在于分别于90°C，200°C，300°C和400°C退火的样品中，并且发现正交晶相在Mo ₁₇ O ₄₇和α中都是高度稳定的相-MoO ₃。合成样品的光催化活性通过使用MB降解来估算。合成的Mo的光催化性能₁₇ ö ₄₇和α-的MoO ₃使用MB的颜色降解研究了纳米结构。据发现，沫₁₇ ö ₄₇和α-的MoO ₃与状结构纳米棒具有降解MB染料的潜力和90分钟，Mo的降解效率的时间₁₇ ö ₄₇和的MoO ₃是56.15％和95.78％ ， 分别。