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首页> 外文期刊>Journal of industrial and engineering chemistry >Arsenic removal from aqueous solutions with Fe-hydrotalcite supported magnetite nanoparticle
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Arsenic removal from aqueous solutions with Fe-hydrotalcite supported magnetite nanoparticle

机译：铁水滑石负载磁铁矿纳米粒子从水溶液中去除砷

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摘要

The sorptive removal of arsenic from water by synthetically-prepared magnetic Fe-hydrotalcite (M-FeHT) seeding by nano magnetite was investigated. The synthesis of M-FeHT was achieved by a co-precipitation method. M-FeHT was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and magnetic susceptibility analysis. Batch tests were conducted to investigate the removal mechanism of As(III) and As(V) by M-FeHT. Kinetic studies revealed that uptake of As(V) (95% removal) and As(III) ions occurs rapidly within the first 15 min, and slows thereafter. The adsorption data follow a pseudo-second-order kinetic model and fit the Langmuir isotherm well. The experimental results show that stable arsenic removal efficiency, and the capability to reduce As levels, make M-FeHT a suitable adsorbent for the treatment of As-polluted waters. After adsorption, tests were conducted with magnetic separation to determine the separability of M-FeHT from solution. At magnetic field intensity of 2 T, the efficiency of M-FeHT separation was 91%. Finally, after adsorption by M-FeHT, residual arsenic concentration decreased to less than 10 μg/L (i.e., below the threshold specified by the WHO). Fe-hydrotalcite-supported magnetite nanoparticles were not only more efficient in the removal of As but also in recovery by the magnetic separator.
机译：研究了通过纳米磁铁矿合成制备的磁性铁水滑石（M-FeHT）种子从水中吸附去除砷的方法。 M-FeHT的合成是通过共沉淀法实现的。使用X射线衍射（XRD），透射电子显微镜（TEM）和磁化率分析对M-FeHT进行表征。进行了分批测试以研究M-FeHT去除As（III）和As（V）的机理。动力学研究表明，As（V）（95％去除）和As（III）离子的吸收在前15分钟内迅速发生，此后变慢。吸附数据遵循伪二级动力学模型，非常适合Langmuir等温线。实验结果表明，稳定的除砷效率和降低As含量的能力使M-FeHT成为处理As污染水的合适吸附剂。吸附后，进行磁分离测试以确定M-FeHT与溶液的可分离性。在2 T的磁场强度下，M-FeHT分离效率为91％。最后，通过M-FeHT吸附后，残留砷浓度降低至小于10μg/ L（即低于WHO规定的阈值）。 Fe-水滑石负载的磁铁矿纳米颗粒不仅在去除As方面更有效，而且在通过磁分离器回收方面更有效。

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