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Study on Active Magnesium Oxide Adsorption Properties of Sr (II) in Aqueous Solution

机译:水溶液中Sr(II)的活性氧化镁吸附性能研究

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The active magnesium oxide (AMO) was synthesized by homogeneous precipitation method with microwave and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and infrared spectroscopy (FTIR). Adsorption of Sr(II) by AMO was investigated under the effect of AMO dosages . pH of solution, temperature and contact time and analyzed the kinetics and thermodynamics characteristics. The results showed that AMO has very good adsorption capacity on Sr(II) in aqueous solution, When pH of solution is 8.0, the solid-liquid ratio is 0.25 g·L~(-1), initial Sr(II) concentration is 50mg·L~(-1), the contact time is 80 min at 298K, the removal rate and adsorption capacity reached 98.29% and 187.5 mg·g~(-1) , respectively. Kinetic and thermodynamic results indicate that adsorption behavior of Sr(II) by AMO fitted well with pseudo-second-order model and the Freundlich isothermal model. Adsorption thermodynamic parameters showed that the process of adsorption is spontaneous and endothermic.
机译:通过微波均匀沉淀法合成了活性氧化镁(AMO),并通过扫描电子显微镜(SEM),能量色散光谱(EDS),X射线衍射(XRD)和红外光谱(FTIR)对其进行了表征。在AMO剂量的影响下,研究了AMO对Sr(II)的吸附。溶液的pH值,温度和接触时间,并分析了动力学和热力学特征。结果表明,AMO对水溶液中的Sr(II)具有很好的吸附能力,当溶液的pH值为8.0时,固液比为0.25 g·L〜(-1),初始Sr(II)浓度为50mg。 ·L〜(-1),在298K下接触时间为80 min,去除率和吸附容量分别达到98.29%和187.5 mg·g〜(-1)。动力学和热力学结果表明,AMO对Sr(II)的吸附行为与拟二阶模型和Freundlich等温模型非常吻合。吸附热力学参数表明吸附过程是自发的并且是吸热的。

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