One-pot synthesis of graphene oxide and Ni-Al layered double hydroxides nanocomposites for the efficient removal of U(VI) from wastewater
One-pot synthesis of graphene oxide and Ni-Al layered double hydroxides nanocomposites for the efficient removal of U(VI) from wastewater
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一锅法合成氧化石墨烯和镍铝层状双氢氧化物纳米复合材料高效去除废水中的U(VI)
DOI：
10.1007/s11426-016-0420-8
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发表时间：
2017-02
期刊：
影响因子：
--
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Yu Shujun;Wang Jian;Song Shuang;Sun Kunyu;Li Jun;Wang Xiangxue;Chen Zhongshan;Wang Xiangke
采用一锅水热法制备了氧化石墨烯/镍铝水滑石（GO@LDH）纳米复合材料，并采用X射线衍射（XRD）、傅立叶变换红外光谱（FTIR）、扫描电镜（SEM）、透射电镜（TEM）、X射线光电子能谱（XPS）和拉曼光谱（拉曼）对其进行了表征。探讨了离子强度、溶液pH、接触时间、U（VI）初始浓度和温度对GO@LDH表面吸附U（VI）的影响。Langmuir吸附等温线结果表明，GO@LDH的吸附容量（160 mg/g）远高于LDH（69 mg/g）和GO（92 mg/g）。GO@LDH表面含氧官能团与U（VI）形成的表面络合物是U（VI）与GO@LDH相互作用的机理。热力学研究结果表明，吸附反应是一个自发的吸热化学过程。吸附等温线符合Langmuir模型，说明吸附作用主要以单分子层覆盖为主。GO@LDH纳米复合材料作为吸附剂在核废料管理和环境修复中从废水中富集放射性核素提供了潜在的应用。
Graphene oxide and Ni-Al layered double hydroxides (GO@LDH) nanocomposites were synthesized via a one-pot hydrothermal process, and characterized by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy in detail. The exploration of U(VI) sorption on GO@LDH surface was performed as a function of ionic strength, solution pH, contact time, U(VI) initial concentrations and temperature. Results of Langmuir isotherms showed that the sorption capacity of GO@LDH (160 mg/g) was much higher than those of LDH (69 mg/g) and GO (92 mg/g). The formed surface complexes between surface oxygen-containing functional groups of GO@LDH and U(VI) turned out to be the interaction mechanism of U(VI) with GO@LDH. According to the thermodynamic studies results, the sorption interaction was actually a spontaneous and endothermic chemical process. The sorption isotherms were better fitted with the Langmuir model compared with other models, which suggested the interaction was mainly dominated by monolayer coverage. The GO@LDH nanocomposites provide potential applications as adsorbents in the enrichment of radionuclides from wastewater in nuclear waste management and environmental remediation.
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