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题名: Self-assembled one-dimensional MnO2@ zeolitic imidazolate framework-8 nanostructures for highly efficient arsenite removal
作者: Jian, Meipeng; Wang, Huan; Liu, Ruiping; Qu, Jiuhui; Wang, Huanting; Zhang, Xiwang
刊名: ENVIRONMENTAL SCIENCE-NANO
出版日期: 2016
卷号: 3, 期号:5, 页码:1186-1194
DOI: 10.1039/c6en00246c
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: Arsenite (As(III)) is more toxic and more difficult to remove from water than arsenate (As(V)). A pre-oxidation step is therefore necessary to achieve higher removal of As(III). In this work, novel one-dimensional (1D) beta-MnO2@ ZIF-8 nanocomposites were successfully synthesized for the first time by a facile and rapid method to achieve concurrent oxidation and adsorptive removal of As(III). In the synthesis step, the solution medium of methanol in the reaction plays a key role in reducing the interfacial energy and promotes the integration, leading to the deposition of ZIF-8 nanocrystals on beta-MnO2 nanowires. The synthesized beta-MnO2@ ZIF-8 exhibited a high surface area of 883 m(2) g(-1). Batch experimental results showed that the as-obtained beta-MnO2@ ZIF-8 nanocomposites could oxidize As(III) to As(V), exhibiting an improved adsorptive removal of arsenite compared to the ZIF-8 bulk. The kinetic and isotherm data of As(III) adsorption on beta-MnO2@ ZIF-8 nanocomposites were well fitted by pseudo-second-order and Langmuir models, respectively. The maximal adsorption capacity of As(III) was 140.27 mg g(-1) at room temperature. Meanwhile, the unique 1D nanostructure of beta-MnO2@ ZIF-8 prevented ZIF-8 agglomeration in the aqueous solution. Moreover, the beta-MnO2@ ZIF-8 nanowires showed excellent settleability by gravity alone and strong mechanical stability.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36210
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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