Manganese doping of magnetic iron oxide nanoparticles: tailoring surface reactivity for a regenerable heavy metal sorbent.
Manganese doping of magnetic iron oxide nanoparticles: tailoring surface reactivity for a regenerable heavy metal sorbent.
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DOI：
10.1021/la2042235
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发表时间：
2012-02
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通讯作者：
Cynthia L. Warner;Wilaiwan Chouyyok;Katie Mackie;D. Neiner;L. Saraf;T. Droubay;M. Warner;R. Addleman
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文献类型：
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作者：
Cynthia L. Warner;Wilaiwan Chouyyok;Katie Mackie;D. Neiner;L. Saraf;T. Droubay;M. Warner;R. Addleman
描述了一种调节磁性无机纳米结构吸附剂对重金属污染物的分析物亲和力的方法。与前驱体材料相比，掺锰氧化铁纳米颗粒吸附剂具有显著的高亲和力。只需调整掺杂剂的量，就可以将吸附剂的亲和力调整到感兴趣的分析物。结果表明，掺锰后，样品对重金属(Co、Ni、Zn、As、Ag、Cd、Hg、Tl)的亲和力和吸附容量均有较大幅度的提高。对河水中镉的去除进行了容量测量，并显示出明显高于为进行比较而测试的相关商业吸附剂的负载量。掺入锰的氧化铁纳米颗粒处理后，Cd浓度从100 ppb的河水降低到1 ppb(低于EPA饮用水中Cd的限值5 ppb)。掺锰的氧化铁纳米颗粒能够负载~1ppm的Cd，然后用温和的酸洗完全反萃和回收Cd。Cd的加载和剥离在多个循环中是一致的，而不会损失吸着剂的性能。
A method for tuning the analyte affinity of magnetic, inorganic nanostructured sorbents for heavy metal contaminants is described. The manganese-doped iron oxide nanoparticle sorbents have a remarkably high affinity compared to the precursor material. Sorbent affinity can be tuned toward an analyte of interest simply by adjustment of the dopant quantity. The results show that following the Mn doping process there is a large increase in affinity and capacity for heavy metals (i.e., Co, Ni, Zn, As, Ag, Cd, Hg, and Tl). Capacity measurements were carried out for the removal of cadmium from river water and showed significantly higher loading than the relevant commercial sorbents tested for comparison. The reduction in Cd concentration from 100 ppb spiked river water to 1 ppb (less than the EPA drinking water limit of 5 ppb for Cd) was achieved following treatment with the Mn-doped iron oxide nanoparticles. The Mn-doped iron oxide nanoparticles were able to load ~1 ppm of Cd followed by complete stripping and recovery of the Cd with a mild acid wash. The Cd loading and stripping is shown to be consistent through multiple cycles with no loss of sorbent performance.