Amino Siloxane Oligomer Modified Graphene Oxide Composite for the Efficient Capture of U(VI) and Eu(III) from Aqueous Solution
Amino Siloxane Oligomer Modified Graphene Oxide Composite for the Efficient Capture of U(VI) and Eu(III) from Aqueous Solution
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DOI：
10.1021/acssuschemeng.7b02316
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发表时间：
2017-10
影响因子：
8.4
通讯作者：
Donglin Zhao;Lili Chen;Ming-Ming Xu-Ming;S. Feng;Yi Ding;M. Wakeel;N. S. Alharbi;Changlun Chen
中科院分区：
文献类型：
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作者：
Donglin Zhao;Lili Chen;Ming-Ming Xu-Ming;S. Feng;Yi Ding;M. Wakeel;N. S. Alharbi;Changlun Chen
聚3-氨丙基三乙氧基硅烷是一种高反应性的高分子聚合物，因为其含有大量的氨基，对不同的金属阳离子表现出很强的亲和力。鉴于此，通过简单的交联反应制备了新型的聚氨基硅氧烷改性氧化石墨烯复合物（PAS-GO），并将其应用于水溶液中U（VI）/Eu（III）离子的捕获。阐述了PAS-GO与U（VI）/Eu（III）的相互作用机理。NH 2改性后，由于与U（VI）/Eu（III）螯合的协同作用，增加了吸附位点，提高了吸附容量。X射线光电子能谱表明，由于胺基中的氮原子提供了与U（VI）/Eu（III）物种的孤对电子，因此氮基团参与了U（VI）/Eu（III）的去除。利用Langmuir等温吸附模型计算了PAS-GO对U（VI）和Eu（III）的最大吸附量，在298 K时分别为310.63和243.90 mg/g。PAS…
Poly 3-aminopropyltriethoxysilane is a highly reactive high-molecular polymer because of the existence of abundant amino groups, which presents a strong affinity toward different metal cations. In view of this, the novel poly amino siloxane oligomer modified graphene oxide composite (PAS–GO) was fabricated by a facile cross-linking reaction and applied to capture U(VI)/Eu(III) ions from aqueous solution. The interaction mechanisms between the PAS–GO and U(VI)/Eu(III) were elaborated. The modification by NH2 increased the sorption sites and improved the sorption capacities because of the synergistic effect of chelation with U(VI)/Eu(III). X-ray photoelectron spectroscopy revealed that nitrogen groups are involved in the removal of U(VI)/Eu(III) since nitrogen atoms of amine groups provided the lone pair of electrons with U(VI)/Eu(III) species. The maximum sorption capacity of U(VI) and Eu(III) on the PAS–GO at 298 K calculated by the Langmuir isotherm model was 310.63 and 243.90 mg/g, respectively. The PAS...