Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China.
J Hazard Mater. 2014 Aug 30;279:26-31. doi: 10.1016/j.jhazmat.2014.06.054. Epub 2014 Jul 2.
Magnetic porous Fe-Mn binary oxide nanowires were successfully fabricated to efficient removal of As(III) from water. The adsorption capacity of the porous nanowires for As(III) obviously increased with increasing of manganese oxide in the composite, accompanying decrease of the saturation magnetization of the adsorbents. Magnetic porous Fe-Mn binary oxide nanowires with an initial Fe:Mn molar ratio of 1:3 exhibited the highest absorption capacity for As(III) and enable magnetic separation from water. The maximal adsorption capacity value is 171mgg(-1) at pH 7.0. In the initial pH range from 3 to 9, 200μgL(-1) of As(III) could be easily decreased to below 10μgL(-1) by the magnetic porous Fe-Mn binary oxide nanowires (0.05gL(-1)) within 75min, and the corresponding residual As was completely oxidized to less toxic As(V). The coexisting chloride, nitrate and sulfate had no significant effect on arsenic removal, whereas, phosphate and humic acid reduced the removal of As(III) by competing with arsenic species for adsorption sites. The resulting magnetic porous Fe-Mn binary oxide nanowires could be a promising adsorbent for As(III) removal from water.
磁性多孔 Fe-Mn 二元氧化物纳米线成功制备，用于从水中高效去除 As(III)。吸附剂对 As(III)的吸附容量随着复合材料中氧化锰含量的增加而明显增加，同时饱和磁化强度降低。具有初始 Fe:Mn 摩尔比为 1:3 的磁性多孔 Fe-Mn 二元氧化物纳米线对 As(III)表现出最高的吸附容量，并能实现从水中的磁性分离。在 pH 值为 7.0 时，最大吸附容量值为 171mgg(-1)。在初始 pH 值范围为 3 至 9 时，200μgL(-1)的 As(III)可在 75min 内通过 0.05gL(-1)的磁性多孔 Fe-Mn 二元氧化物纳米线很容易降低到 10μgL(-1)以下，相应的残留 As 完全被氧化为毒性较小的 As(V)。共存的氯离子、硝酸根和硫酸根对砷的去除没有显著影响，而磷酸根和腐殖酸通过与砷物种竞争吸附位点而减少了 As(III)的去除。所得磁性多孔 Fe-Mn 二元氧化物纳米线可能是一种很有前途的用于从水中去除 As(III)的吸附剂。
Zotero 插件