Surface reactivity of hydroxyapatite nanocoatings deposited on iron oxide magnetic spheres toward toxic metals.
Surface reactivity of hydroxyapatite nanocoatings deposited on iron oxide magnetic spheres toward toxic metals.
复制标题
DOI：
10.1016/j.jcis.2013.11.031
复制
发表时间：
2014-03
影响因子：
9.9
通讯作者：
Huihui Yang;S. Masse;Hao Zhang;C. Hélary;Laifeng Li;T. Coradin
中科院分区：
文献类型：
--
作者：
Huihui Yang;S. Masse;Hao Zhang;C. Hélary;Laifeng Li;T. Coradin
假设羟基磷灰石和磁铁矿是两种环境友好的矿物相，对于修复过程具有丰富的特性。磁芯@吸附剂壳纳米结构的形成应该为从水介质中去除有毒金属提供有效的材料。然而，羟基磷灰石的纳米级限制可能会影响其反应性。实验通过在氧化铁球上表面控制沉积厚度为 10 nm 至 150 nm 的羟基磷灰石层，制备了 Fe3O4@羟基磷灰石纳米复合材料。通过批量吸附实验、X射线衍射和电子显微镜研究了核壳颗粒对环境相关的选定无机离子（Pb(II)、Y(III)、Eu(III)、Sb(III)）的表面反应性。结果羟基磷灰石涂层的反应性从部分阳离子交换到壳的溶解/转化不等。反应的性质和程度很大程度上取决于羟基磷灰石层结构，但不受磁芯的显着影响。这些新型纳米复合材料应该可用于环境应用。
HypothesisHydroxyapatite and magnetite are two environmentally-friendly mineral phases that have fruitful properties for remediation process. The formation of magnetic core@sorbent shell nanostructures should provide efficient materials for toxic metal removal from aqueous media. However the nanoscale confinement of hydroxyapatite may influence its reactivity.ExperimentsFe3O4@Hydroxyapatite nanocomposites were prepared by surface-controlled precipitation of hydroxyapatite layers from 10 nm to 150 nm in thickness on iron oxide spheres. The surface reactivity of the core–shell particles toward selected inorganic ions of environmental relevance (Pb(II), Y(III), Eu(III), Sb(III)) was studied by batch sorption experiments, X-ray diffraction and electron microscopy.FindingsThe reactivity of the hydroxyapatite coating varied from partial cation exchange to dissolution/transformation of the shell. The nature and extent of the reactions depended significantly on the hydroxyapatite layer structure but was not significantly influenced by the magnetic core. These novel nanocomposites should be useful for environmental applications.