Dispersedly embedded loading of Fe3O4 nanoparticles into graphene nanosheets for highly efficient and recyclable removal of heavy metal ions
Dispersedly embedded loading of Fe3O4 nanoparticles into graphene nanosheets for highly efficient and recyclable removal of heavy metal ions
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将 Fe3O4 纳米粒子分散嵌入石墨烯纳米片中，以高效且可回收地去除重金属离子
DOI：
10.1039/c5nj00897b
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发表时间：
2015-08
影响因子：
3.3
通讯作者：
Hu Jingguo
中科院分区：
文献类型：
--
作者：
Zhou Gang;Xu Xiaoyong;Zhu Wenchang;Feng Bing;Hu Jingguo
利用水热自组装技术，在氧化石墨烯（GO）还原过程中，沿着将Fe 3 O 4纳米颗粒（NPs）有序负载到石墨烯纳米片（NS）基体中.优化的石墨烯/Fe 3 O 4（GF）复合材料具有分散嵌入的杂化，其产生高的表面积作为活性吸附位点，并提供有效保护Fe 3 O 4 NPs免于在废水中释放、聚集、氧化或溶解，以及稳定的超顺磁性，允许快速的磁性回收。在酸性和中性溶液中，该吸附剂对Cr（VI）具有较高的吸附容量，吸附动力学符合化学吸附的准二级动力学模型。此外，吸附性能表现出广谱的普遍性，包括各种重金属离子，包括Fe（III），Cu（II），Cd（II）等，并具有可回收性后，pH值控制的解吸，因此GF复合材料已被证明是一个有前途的可分离吸附剂，用于去除废水中的重金属。
The regulated loading of Fe3O4 nanoparticles (NPs) into a graphene nanosheet (NS) matrix along with the process of reducing graphene oxide (GO) has been achieved via a facile hydrothermal self-assembly strategy. The optimized graphene/Fe3O4 (GF) composite with dispersedly embedded hybridization which yields a high surface area serving as active adsorption sites and providing effective protection of the Fe3O4 NPs against release, aggregation, oxidation or dissolution in wastewater, as well as stable superparamagnetism allowing fast magnetic recycling. It exhibits fast Cr(VI) removal with a high adsorption capacity in acidic and neutral solutions, and the adsorption kinetics follow the pseudo-second-order model in accordance with the chemisorption in nature. Moreover, the adsorption performance shows a broad-spectrum universality to various heavy metal ions including Fe(III), Cu(II), Cd(II), etc. and has recyclability after pH-manipulated desorption, thus the GF composite has been demonstrated as a promising separable adsorbent for removing heavy metals from wastewater.
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