Monodispersed hierarchical aluminum/iron oxides composites micro/nanoflowers for efficient removal of As(V) and Cr(VI) ions from water
Monodispersed hierarchical aluminum/iron oxides composites micro/nanoflowers for efficient removal of As(V) and Cr(VI) ions from water
复制标题
单分散分级铝/铁氧化物复合微/纳米花可有效去除水中的 As(V) 和 Cr(VI) 离子
DOI：
10.1016/j.jallcom.2015.12.062
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发表时间：
2016
影响因子：
6.2
通讯作者：
Xuanhua Li
中科院分区：
文献类型：
--
作者：
Yongxing Zhang;Yingjie Ye;Zhongliang Liu;Bing Li;Qinzhuang Liu;Qiangchun Liu;Xuanhua Li
许多纳米材料已被广泛报道用于去除有毒的无机金属离子。然而，一些纳米级的吸附剂容易发生严重的团聚。例如，直接合成单分散的Fe(OH)3纳米材料是非常困难的。本文以单分散的层状γ-Al_2O_3纳米粒子为吸附载体，通过静电吸引将Fe(OH)_3胶体纳米粒子沉积在层状γ-Al_2O_3纳米结构的表面，形成具有层状结构的γ-Al_2O_3/Fe(OH)_3复合材料。分级结构的γ-Al_2O_3/Fe(OH)_3复合材料具有较高的比表面积和较大的孔容，用于吸附水溶液中As(V)和Cr(VI)的阴离子。具有分级结构的单分散γ-Al_2O_3/Fe(OH)_3复合材料对As(V)和Cr(VI)的最大容量分别为61.99 mg/g−_1和24.13 mg/g−_1，高于已报道的其他金属氧化物纳米结构。此外，具有分级结构的单分散γ-Al_2O_3/Fe(OH)_3复合材料对As(V)和Cr(VI)的吸附速率较快。γ-Al_2O_3/Fe(OH)_3层次型微/纳结构对As(V)和Cr(VI)的吸附能力较强，在环境修复方面具有广阔的应用前景。
Many nanomaterials have been widely reported for removal of toxic inorganic metal ions. However, some nanoscale adsorbents are subject to serious aggregation. For example, it is very difficult to directly synthesize the monodispersed Fe(OH)3nanomaterials. Here, through using the monodispersed hierarchical γ-Al2O3nanoflowers as adsorbent supports, the Fe(OH)3colloid nanoparticles have been well deposited onto the surfaces of the hierarchical γ-Al2O3nanostructures to form γ-Al2O3/Fe(OH)3composites with hierarchical structures via an electrostatic attraction without forming large aggregates. The γ-Al2O3/Fe(OH)3composites with hierarchical structures have high specific surface areas and large pore volumes, which are used as adsorbents to remove anion species of As(V) and Cr(VI) from aqueous solution. The maximum capacities of the monodispersed γ-Al2O3/Fe(OH)3composites with hierarchical structures for As(V) and Cr(VI) are determined at 61.99 mg g−1and 24.13 mg g−1, respectively, which are higher than those of the other metal oxide nanostructures reported. In addition, the adsorption rates of As(V) and Cr(VI) onto the monodispersed γ-Al2O3/Fe(OH)3composites with hierarchical structures are rather fast. The γ-Al2O3/Fe(OH)3hierarchical micro/nanoflower structures show high adsorption capacity for removing anion species of As(V) and Cr(VI), demonstrating a promising potential in environmental remediation.