Amidoxime-grafted multiwalled carbon nanotubes by plasma techniques for efficient removal of uranium(VI)

Amidoxime-grafted multiwalled carbon nanotubes by plasma techniques for efficient removal of uranium(VI)
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通过等离子体技术接枝偕胺肟多壁碳纳米管有效去除铀(VI)

DOI:
10.1016/j.apsusc.2014.08.182
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发表时间:
2014-11
影响因子:
6.7
通讯作者:
Jun Tang
Jun Tang
中科院分区:
材料科学1区
文献类型:
--
作者:
Jiali Liao;Yuanyou Yang;Ning Liu;Jun Tang

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采用等离子体技术合成了一种新型固相萃取剂--偕胺肟接枝多壁碳纳米管(AO-g-MWCNTs),用于从核工业废水中选择性分离铀。采用红外光谱(FT-IR)、元素分析、拉曼光谱、扫描电镜(SEM)和热重分析(TGA)对吸附剂进行了表征。通过改变pH值、接触时间、铀初始浓度和温度,研究了AO-g-MWCNTs对铀(VI)的吸附行为。在pH 4.5时,U(VI)的最佳吸附容量为145 mg g−1(0.61 mmol g−1)。利用X射线光电子能谱(XPS)研究了U(VI)在AO-g-MWCNTs上的吸附机理。此外,AO-g-MWCNTs在共存离子(Mn 2+、Co2+、Ni 2+、Zn 2+、Sr 2+、Ba 2+和Cs+)的水溶液中对U(VI)具有选择性吸附作用。研究表明,AO-g-MWCNTs是一种有效去除水溶液中U(VI)的潜在吸附剂。
A novel solid-phase extractant, amidoxime-grafted multiwalled carbon nanotubes (AO-g-MWCNTs), has been synthesized using plasma techniques to selectively separate uranium from nuclear industrial effluents. The adsorbent was characterized by Fourier transform infrared spectra (FT-IR), elemental analysis, Raman, scanning electron microscopy (SEM), and thermal gravity analysis (TGA). Sorption behaviors of uranium(VI) on AO-g-MWCNTs were investigated by varying pH, contact time, initial uranium concentration, and temperature. An optimum sorption capacity of 145 mg g−1(0.61 mmol g−1) for U(VI) was obtained at pH 4.5. X-ray photoelectron spectroscopy (XPS) has been used to explore the sorption mechanism of U(VI) on AO-g-MWCNTs. Furthermore, AO-g-MWCNTs could selectively adsorb U(VI) in aqueous solution containing co-existing ions (Mn2+, Co2+, Ni2+, Zn2+, Sr2+, Ba2+and Cs+). This study shows that AO-g-MWCNTs are potential adsorbent for effective removal of U(VI) from aqueous solution.
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