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首页> 外文期刊>RSC Advances >Facile synthesis of MoO2/CaSO4 composites as highly efficient adsorbents for congo red and rhodamine B
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Facile synthesis of MoO2/CaSO4 composites as highly efficient adsorbents for congo red and rhodamine B

机译：便捷合成MoO 2 / CaSO 4 复合材料作为刚果红和若丹明B的高效吸附剂

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A novel rod-shaped MoO2/CaSO4 composite was prepared by using hexa-ammonium molybdate and flue gas desulfurization gypsum via a simple mixed-solvothermal route. In this composite, CaSO4 matrices are decorated with MoO2 nanoparticles, and non-structural mesopores are formed via particle packing. Moreover, it displays an excellent adsorption capability towards anionic congo red (CR) and cationic rhodamine B (RhB). The adsorption quantities per unit mass and removal efficiencies of the two dyes are significantly influenced by adsorbent dose, solution pH, and temperature. The adsorption isotherm data can be best fitted by the Langmuir model, and the calculated maximum adsorption quantities at 303.5 K are 853.54?mg g?1 for CR and 86.38 mg g?1 for RhB, respectively, which are superior to other common adsorbents. The corresponding kinetic data can be well matched with the pseudo-second-order model. Additionally, the CR adsorption is an exothermic process, while the RhB adsorption is an endothermic process. Both of them are multi-step chemisorption processes influenced by surface adsorption and intra-particle diffusion. This MoO2/CaSO4 composite can be applied as an alternative adsorbent for removing organic dyestuffs from printing and dyeing wastewater.
机译：钼酸六铵和烟气制备新型棒状MoO 2 / CaSO 4 复合材料通过简单的混合溶剂热法脱硫石膏。在该复合材料中，用MoO 2 纳米粒子修饰CaSO 4 基质，并形成非结构性介孔< em>通过颗粒填充。此外，它对阴离子刚果红（CR）和阳离子若丹明B（RhB）表现出出色的吸附能力。两种染料的每单位质量吸附量和去除效率受吸附剂量，溶液pH和温度的影响很大。 Langmuir模型可以最好地拟合吸附等温线数据，对于CR，在303.5 K下计算的最大吸附量为853.54？mg g ？1 。 rhB的small> ？1 分别优于其他常见的吸附剂。相应的动力学数据可以与伪二阶模型很好地匹配。此外，CR吸附是放热过程，而RhB吸附是吸热过程。它们都是受表面吸附和粒子内扩散影响的多步化学吸附过程。这种MoO 2 / CaSO 4 复合材料可用作替代吸附剂，用于去除印染中的有机染料废水。

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