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A facile one-step synthesized epsilon-MnO2 nanoflowers for effective removal of lead ions from wastewater.
Chemosphere ( IF 8.1 ) Pub Date : 2020-02-25 , DOI: 10.1016/j.chemosphere.2020.126329 Mei Lin 1 , Zuliang Chen 1
Chemosphere ( IF 8.1 ) Pub Date : 2020-02-25 , DOI: 10.1016/j.chemosphere.2020.126329 Mei Lin 1 , Zuliang Chen 1
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The increasing contamination of lead ions (Pb(II)) in groundwater has become a serious environmental issue, which provides the impetus for intense research on Pb(II) removal. ε-MnO2 nanoflowers were successfully fabricated through a simple decomposition reaction. And the obtained ε-MnO2 nanoflowers were employed to remove Pb(II) from water. The detailed microstructure and surface properties of ε-MnO2 were systematically characterized. The results indicate that the pure ε-MnO2 phase was obtained and the specific surface area is 96.33 m2 g-1. Batch adsorption experiments of Pb(II) were carried out, and the ε-MnO2 nanoflowers exhibited outstanding adsorption performance. The maximum adsorption capacity for Pb(II) and Cd(II) achieved to 239.7 mg g-1 and 73.6 mg g-1 at the dosage of 0.2 g L-1. Besides, the prepared ε-MnO2 nanoflowers show much higher removal efficiency toward Pb(II) compared with commercial MnO2. The XRD results reveal the stability of ε-MnO2 nanoflowers, and the XPS results suggest that both the electrostatic interaction and structural tunnels are responsible for the removal mechanisms of Pb(II). This work finds a facile method to synthesize ε-MnO2 nanoflowers, showing great potential for Pb(II) removal.
中文翻译：
一种简便的一步合成的epsilon-MnO2纳米花，用于有效去除废水中的铅离子。
地下水中铅离子（Pb（II））污染的增加已成为一个严重的环境问题，这为深入研究Pb（II）的去除提供了动力。通过简单的分解反应成功制备了ε-MnO2纳米花。并将所得的ε-MnO2纳米花用于从水中去除Pb（II）。系统地表征了ε-MnO2的详细微观结构和表面性能。结果表明，获得了纯的ε-MnO2相，比表面积为96.33 m2 g-1。进行了Pb（II）的间歇吸附实验，结果表明，ε-MnO2纳米花具有优异的吸附性能。在0.2 g L-1的剂量下，对Pb（II）和Cd（II）的最大吸附容量达到239.7 mg g-1和73.6 mg g-1。除了，制备的ε-MnO2纳米花与商用MnO2相比，对Pb（II）的去除效率更高。XRD结果揭示了ε-MnO2纳米花的稳定性，而XPS结果表明，静电相互作用和结构隧道都是Pb（II）去除机理的原因。这项工作找到了一种简便的方法来合成ε-MnO2纳米花，显示出去除Pb（II）的巨大潜力。
更新日期：2020-02-25
中文翻译：
一种简便的一步合成的epsilon-MnO2纳米花，用于有效去除废水中的铅离子。
地下水中铅离子（Pb（II））污染的增加已成为一个严重的环境问题，这为深入研究Pb（II）的去除提供了动力。通过简单的分解反应成功制备了ε-MnO2纳米花。并将所得的ε-MnO2纳米花用于从水中去除Pb（II）。系统地表征了ε-MnO2的详细微观结构和表面性能。结果表明，获得了纯的ε-MnO2相，比表面积为96.33 m2 g-1。进行了Pb（II）的间歇吸附实验，结果表明，ε-MnO2纳米花具有优异的吸附性能。在0.2 g L-1的剂量下，对Pb（II）和Cd（II）的最大吸附容量达到239.7 mg g-1和73.6 mg g-1。除了，制备的ε-MnO2纳米花与商用MnO2相比，对Pb（II）的去除效率更高。XRD结果揭示了ε-MnO2纳米花的稳定性，而XPS结果表明，静电相互作用和结构隧道都是Pb（II）去除机理的原因。这项工作找到了一种简便的方法来合成ε-MnO2纳米花，显示出去除Pb（II）的巨大潜力。
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