Synthesis and application of magnetic graphene/iron oxides composite for the removal of U(VI) from aqueous solutions
Synthesis and application of magnetic graphene/iron oxides composite for the removal of U(VI) from aqueous solutions
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磁性石墨烯/氧化铁复合材料的合成及其在水溶液中去除U(VI)的应用
DOI：
10.1016/j.cej.2013.01.038
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发表时间：
2013-03
影响因子：
15.1
通讯作者：
Chaohui He
中科院分区：
文献类型：
--
作者：
Yaolin Zhao;Hai Wang;Hui Pan;Chaohui He
石墨烯因其显著的物理化学特性而受到多学科研究领域的广泛关注。本文以石墨烯为原料，采用化学反应法制备磁性石墨烯/铁氧化物复合材料（Fe 3 O 4/GO），并将其作为一种新型吸附剂用于水溶液中U（VI）离子的预富集和固化。在Cu（VI）初始浓度为1.12×10− 4 mol/L的条件下，研究了U（VI）在Fe 3 O 4/GO表面的吸附行为。在Cu（VI）初始浓度为2.25×10− 5 ~ 2.24×10− 4 mol/L的条件下，采用Langmuir和Freundlich吸附等温线模型对3种温度下的吸附等温线进行了模拟，结果表明，温度越高，吸附反应越有利.结果表明，在低pH条件下，U（VI）在Fe 3 O 4/GO上的吸附机理为内球表面络合，而在高pH条件下，U（VI）的去除机理为沉淀和内球表面络合.在T= 293 K、pH=5.5±0.1时，U（VI）在Fe 3 O 4/GO上的最大吸附量为69.49mg/g，高于大多数材料和纳米材料的吸附量。磁分离被认为是一种有效和快速的分离磁性颗粒的技术，无需过滤和离心。在外加磁场作用下，Fe 3 O 4/GO可从大体积水溶液中顺利分离。实验结果表明，Fe_3O_4/GO是一种很有前途的吸附剂，可用于去除大体积水溶液中的放射性核素和重金属离子。
Graphene has been extensively concerned in multidisciplinary research fields due to its remarkably physicochemical characteristics. Herein, magnetic graphene/iron oxides composite (Fe3O4/GO) which was synthesized from graphene using a chemical reaction approach had been employed as a novel adsorbent for the preconcentration and solidification of U(VI) ions from aqueous solutions. The sorption behavior of U(VI) on the surface of Fe3O4/GO was carried out under ambient conditions such as contact time, pH and ionic strength according to concentration of CU(VI)initial=1.12×10−4mol/L. The Langmuir and Freundlich models were adopted to simulate sorption isotherms of U(VI) at three different temperatures relying on the concentration of CU(VI)initial=2.25×10−5to 2.24×10−4mol/L, the experimental results suggested that the sorption reaction was favored at higher temperature. The pH-dependent and ionic strength-independent U(VI) sorption on Fe3O4/GO demonstrated that the sorption mechanism of U(VI) was inner-sphere surface complexation at low pH values, whereas the removal of U(VI) was achieved by simultaneous precipitation and inner-sphere surface complexation at high pH values. The maximum sorption capacity of U(VI) on Fe3O4/GO at T=293K and pH=5.5±0.1 was about 69.49mg/g higher than majority of materials and nanomaterials reported. Magnetic separation has been considered as an effective and quick technique for separating magnetic particles, without filtration and centrifugation. The Fe3O4/GO can be favorably separated from aqueous solution under an applied magnetic field from large volumes of aqueous solutions. The experimental results show that the Fe3O4/GO is a promising adsorbent for the removal of radionuclides and heavy metal ions from large volumes of aqueous solution.
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