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首页> 外文期刊>Marine Chemistry >Removal and recovery of strontium (Sr(Ⅱ)) from seawater by Fe_3O_4/MnO_2/ fulvic acid nanocomposite
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Removal and recovery of strontium (Sr(Ⅱ)) from seawater by Fe_3O_4/MnO_2/ fulvic acid nanocomposite

机译:Fe_3O_4 / MnO_2 /黄腐酸纳米复合材料对海水中锶(Sr(Ⅱ))的去除和回收

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In this study, Fe3O4/MnO2/FA nanocomposite was synthesized as a low cost adsorbent with high adsorption capacity, desorption efficiency and reusability for Sr(II) extraction from seawater. FT-IR, FESEM-EDS, XRD, VSM and BET experiments were used to characterize the composite. Sr(II) adsorption onto Fe3O4/MnO2/FA followed a pseudo-first-order kinetic model and was well fitted with the Langmuir isotherm model. Fe3O4/MnO2/FA has demonstrated an excellent adsorption capacity of 227.3 mg/g for Sr(II) ions at 25 degrees C and pH 8. The composite showed high selective uptake of Sr(II) in the presence of cations Na, Mg and Ca. However, Ca ions reduced the Sr (II) uptake from 49.1 to 41.0 mg/g at 600 mg/L Ca. Sr(II) desorption was performed using 0.1 M HCl which showed an excellent desorption efficiency. In natural seawater containing 9.4 rng/L Sr(II), without changing the physicochemical conditions, Fe3O4/MnO2/FA composite showed 6.4 mg/g of Sr(II) adsorption, which leads to save time and energy consumption.
机译:在这项研究中,Fe3O4 / MnO2 / FA纳米复合材料是一种低成本吸附剂,具有高吸附能力,解吸效率和可重复利用性,可用于海水中Sr(II)的提取。 FT-IR,FESEM-EDS,XRD,VSM和BET实验用于表征复合材料。 Sr(II)在Fe3O4 / MnO2 / FA上的吸附遵循拟一级动力学模型,并且与Langmuir等温线模型完全吻合。 Fe3O4 / MnO2 / FA在25°C和pH 8下显示出对Sr(II)离子的优异吸附能力,为227.3 mg / g。在阳离子Na,Mg和阳离子存在下,该复合材料显示出对Sr(II)的高选择性吸收。钙但是,Ca离子在600 mg / L Ca下将Sr(II)的吸收从49.1 mg / g降低到41.0 mg / g。使用0.1 M HCl进行Sr(II)的解吸,显示出极好的解吸效率。在含有9.4 rng / L Sr(II)的天然海水中,在不改变物理化学条件的情况下,Fe3O4 / MnO2 / FA复合材料显示出6.4 mg / g的Sr(II)吸附,从而节省了时间和能源。

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