Adsorption behavior and mechanism of Fe-Mn binary oxide nanoparticles: Adsorption of methylene blue
Adsorption behavior and mechanism of Fe-Mn binary oxide nanoparticles: Adsorption of methylene blue
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Fe-Mn二元氧化物纳米颗粒的吸附行为及机理：亚甲基蓝的吸附
DOI：
10.1016/j.jcis.2018.12.094
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发表时间：
2019-03-15
影响因子：
9.9
通讯作者：
Mao, Liang
中科院分区：
文献类型：
--
作者：
Lu, Kun;Wang, Tingting;Mao, Liang
含有机染料废水已引起全世界的关注。因此，迫切需要开发从废水中去除有机染料的材料。采用共沉淀法制备了纳米结构的铁锰二元氧化物（nFMBO），并将其用于去除水中亚甲基蓝（MB）。表征结果表明，所制备的纳米FMBO具有典型的褶皱结构。然后通过批实验研究了nFMBO的吸附性能。吸附动力学符合准二级动力学模型，吸附等温线符合Langmuir模型，25 ℃时最大吸附量为72.32 mg/g。溶液pH是影响吸附的关键因素，高pH条件下吸附剂对亚甲基蓝的去除效果较好。此外，研究发现共存阴离子（CO 32-、SO 42-、PO 33-）对亚甲基蓝的去除没有显著影响。更重要的是，nFMBO可以很容易地从水中分离和再生的酸洗脱，和nFMBO的吸附效率仅下降到85.1%的初始容量后，5个吸附-再生循环。这些结果表明，nFMBO可以成为从废水中去除MB的替代吸附剂。(C)2018爱思唯尔公司All rights reserved.
Wastewater containing organic dyes has caused worldwide concern. It is thus imperative to develop materials to remove organic dyes from wastewater. In this study, a nano-structured Fe-Mn binary oxide (nFMBO) was synthesized via a facile coprecipitation approach and used for methylene blue (MB) removal from aqueous solution. Characteristic results indicated that the as-prepared nFMBO had a typical wrinkled structure. The adsorption performance of the nFMBO was then investigated by batch experiments. The adsorption kinetics was well fitted to a pseudo-second-order kinetics model, and the adsorption isotherms agreed well with the Langmuir model with a maximum adsorption capacity of 72.32 mg/g at 25 degrees C. Solution pH was a key factor for adsorption and the absorbent exhibited better removal efficiency for MB in solution with high pH. In addition, it was found that the investigated coexisting anions (CO32-, SO42-, PO33-) did not have a significant influence on MB removal. More importantly, the nFMBO could be easily separated from the water and regenerated by acid elution, and the adsorption efficiency of the nFMBO only decreased to 85.1% of the initial capacity after five adsorption-regeneration cycles. These results indicate that the nFMBO can become an alternative adsorbent for the removal of MB from wastewater. (C) 2018 Elsevier Inc. All rights reserved.