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Iron-silver oxide nanoadsorbent synthesized by co-precipitation process for fluoride removal from aqueous solution and its adsorption mechanism

机译：通过共沉淀工艺合成铁 - 氧化银纳米吸收性，用于从水溶液及其吸附机构中除去氟化物

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摘要

Fe-Ag magnetic binary oxide nanoparticles (Fe-Ag MBON) are prepared with co-precipitation of ferric and ferrous chloride solutions, and used for the adsorption of fluoride from aqueous solution. The surface morphology of the adsorbent was characterized by XRD, SEM, TEM, FTIR, XPS, EDX, BET, DLS and VSM techniques. Batch method was followed to optimize the conditions for the removal of fluoride. The results showed maximum removal occurred at pH 3.0 and adsorption equilibrium was achieved within 20 min. Chemical kinetics of the adsorption were well fitted by pseudo-second order models (R-2 > 0.968) and the adsorption process followed the Langmuir isotherm model well (R-2 > 0.976). The fluoride adsorption capacity of Fe-Ag MBON was 22.883 mg g(-1), and decreased with increasing the temperature. Thermodynamic values revealed that the fluoride adsorption process was spontaneous and exothermic. Regeneration experiments were carried out for six cycles and the results indicate a removal efficiency loss of <22%.
机译：Fe-Ag磁性二元氧化物纳米颗粒（Fe-Ag Mbon）用共沉淀的氯化铁溶液的共沉淀制备，用于从水溶液中吸附氟化物。吸附剂的表面形态的特征在于XRD，SEM，TEM，FTIR，XPS，EDX，BET，DLS和VSM技术。遵循分批方法以优化除去氟化物的条件。结果显示在pH 3.0时发生最大的去除，并在20分钟内实现吸附平衡。吸附的化学动力学通过伪二次阶型型号（R-2> 0.968）良好，吸附过程跟随Langmuir等温线井（R-2> 0.976）。 Fe-Ag Mbon的氟化物吸附容量为22.883mg（-1），随着温度的增加而降低。热力学值表明，氟化物吸附过程是自发性和放热的。再生实验六个循环，结果表明除去效率损失<22％。

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  • 来源
    《RSC Advances》 |2015年第106期|共15页
  • 作者

    Azari Ali; Kalantary Roshanak Rezaei; Ghanizadeh Ghader; Kakavandi Babak; Farzadkia Mahdi; Ahmadi Ehsan;

  • 作者单位

    Univ Tehran Med Sci Sch Publ Hlth Dept Environm Hlth Engn Tehran Iran;

    Iran Univ Med Sci Sch Publ Hlth Dept Environm Hlth Engn Tehran Iran;

    Baqiyatallah Univ Med Sci Hlth Res Ctr Tehran 1471613151 Iran;

    Jundishapur Univ Med Sci Sch Publ Hlth Dept Environm Hlth Engn Ahwaz Iran;

    Iran Univ Med Sci Sch Publ Hlth Dept Environm Hlth Engn Tehran Iran;

    Univ Tehran Med Sci Sch Publ Hlth Dept Environm Hlth Engn Tehran Iran;

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  • 正文语种 eng
  • 中图分类 化学;
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