Synthesis of water-soluble magnetic graphene nanocomposites for recyclable removal of heavy metal ions
Synthesis of water-soluble magnetic graphene nanocomposites for recyclable removal of heavy metal ions
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DOI：
10.1039/c2ta00294a
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发表时间：
2013-01
影响因子：
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通讯作者：
Wenjing Zhang;Xinhao Shi;Yixuan Zhang;W. Gu;Bingyu Li;Y. Xian
中科院分区：
文献类型：
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作者：
Wenjing Zhang;Xinhao Shi;Yixuan Zhang;W. Gu;Bingyu Li;Y. Xian
本文首次通过铜催化叠氮-炔环加成反应合成了氧化石墨烯/Fe 3 O 4（GO/Fe 3 O 4）复合材料。采用聚丙烯酸（PAA）对石墨烯进行改性，得到了水溶性磁性石墨烯纳米复合材料。采用原子力显微镜、透射电子显微镜、X射线衍射、拉曼光谱、傅里叶变换红外光谱、热重分析和振动样品磁强计等对PAA/GO/Fe 3 O 4纳米复合材料进行了表征。由于PAA/GO/Fe 3 O 4纳米复合材料具有高的比表面积、良好的络合能力和超顺磁性，可作为纳米吸附剂用于水溶液中Cu 2+、Cd 2+和Pb 2+离子的可循环吸附。结果表明，PAA/GO/Fe 3 O 4纳米复合材料对Cu ~（2+）、Cd ~（2+）和Pb ~（2+）具有很好的去除效果。此外，由于Fe 3 O 4的超顺磁性，PAA/GO/Fe 3 O 4纳米复合材料非常容易分离和回收。5次循环后，纳米吸附剂对Cu 2+、Cd 2+和Pb 2+的去除率均在85%以上。研究结果表明，水溶性磁性石墨烯复合材料是一种有效的重金属吸附剂，可为水体净化提供新的平台。
In this work, graphene oxide/Fe3O4 (GO/Fe3O4) composites were synthesized via a copper catalyzed azide-alkyne cycloaddition reaction for the first time. After further modification with polyacrylic acid (PAA), water-soluble magnetic graphene nanocomposites were obtained. The PAA/GO/Fe3O4nanocomposites were characterized by atomic force microscopy, transmission electron microscopy, X-ray diffraction, Raman, Fourier transform infrared spectroscopy, thermogravimetric analysis and vibrating sample magnetometry. Due to the high surface area, excellent complex ability and superparamagnetism, the PAA/GO/Fe3O4 nanocomposites were used as nanoadsorbents for recyclable removal of Cu2+, Cd2+ and Pb2+ ions from aqueous solution. It is found that the PAA/GO/Fe3O4 nanocomposites show extraordinary removal capacity for Cu2+, Cd2+ and Pb2+ ions. Moreover, the PAA/GO/Fe3O4 nanocomposites are very easy to separate and recycle due to the superparamagnetism of Fe3O4. After five cycles, the removal efficacy of the nanoadsorbents for Cu2+, Cd2+ and Pb2+ ions is over 85%. All of the results demonstrate that the water-soluble magnetic graphene composites are effective adsorbents for removal of heavy metals and thus could provide a new platform for water cleanup.