Synthesis of amidoximated graphene oxide nanoribbons from unzipping of multiwalled carbon nanotubes for selective separation of uranium(VI)
Synthesis of amidoximated graphene oxide nanoribbons from unzipping of multiwalled carbon nanotubes for selective separation of uranium(VI)
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多壁碳纳米管解链合成偕胺肟化氧化石墨烯纳米带用于选择性分离铀（VI）
DOI：
10.1039/c5ra15977f
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发表时间：
2015-10
期刊：
影响因子：
3.9
通讯作者：
Jun Tang
中科院分区：
文献类型：
--
作者：
Yun Wang;Zhengshang Wang;Jun Tang
以多壁碳纳米管解拉制得的氧化石墨烯纳米带(GONRs)为固体基质，以胺肟(AO)为官能团，研究了一种铀选择性吸附剂。采用化学接枝技术成功地制备了胺肟官能化GONRs(AOGONRs)，并用扫描电子显微镜、X射线粉末衍射、傅立叶变换红外光谱、元素分析、热重分析和X射线光电子能谱对其进行了表征。将所制备的AOGONRs用于吸附水溶液中的U(VI)，由于AOGONRs对U(VI)有很强的络合作用，因此对U(VI)有很高的吸附容量。结果表明，AOGONRs对铀的吸附是一个与pH有关、与离子强度无关、快速、吸热、自发的准二级过程。在pH=4.5T=298K时，U(VI)的吸附量达到502.6 mg g−1(2.112 mgg−1)。在模拟核工业废水中的吸附研究表明，该吸附剂对多种竞争金属离子具有良好的选择性。结果表明，AOGONRs可能是一种从各种含铀水样中分离铀(VI)的潜在和合适的候选者。
A kind of uranium-selective sorbent has been studied using graphene oxide nanoribbons (GONRs) from the unzipping of multiwalled carbon nanotubes as a solid matrix and amidoxime (AO) as a functional group. Amidoxime-functionalized GONRs (AOGONRs) were successfully prepared by chemical grafting technology and characterized by scanning electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis and X-ray photoelectron spectroscopy. The as-prepared AOGONRs were applied to adsorb U(VI) from aqueous solutions and exhibited a high sorption capacity towards U(VI) due to the strong chelation of AO to U(VI). It can be noted that the uranium sorption on the AOGONRs was pH-dependent, ionic strength-independent, fast, endothermic, spontaneous and a pseudo-second order process. The U(VI) sorption amount reached up to 2.112 mmol g−1 (502.6 mg g−1) at pH = 4.5 and T = 298 K. The sorption study performed in a simulated nuclear industry effluent demonstrated that the new sorbent had a desirable selectivity towards U(VI) ions over a range of competing metal ions. The results suggest that AOGONRs may be a potential and suitable candidate for the separation of U(VI) from various uranium-containing water samples.
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