State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China.
J Colloid Interface Sci. 2013 Oct 15;408:25-32. doi: 10.1016/j.jcis.2013.07.011. Epub 2013 Jul 20.
Magnetic hybrid nanomaterials composed of reduced graphene oxide, zero-valent nickel, and NiAl-mixed metal oxides (rGO/Ni/MMO) have been synthesized by calcining graphene oxide (GO)/layered double hydroxide (LDH) hybrid in nitrogen atmosphere. Structural characterizations demonstrate that with the presence of GO substrate, NiAl-LDHs can be reduced into zero-valent Ni and NiAl-MMOs during calcination. Transmission electron microscopy (TEM) is used to investigate the morphology of the as-prepared hybrid nanomaterials, demonstrating that the introduction of GO substrate prevents the aggregation of LDHs. Magnetism characterization proves the ferromagnetic property of rGO/Ni/MMO hybrid. This magnetic hybrid nanomaterial exhibits excellent adsorption ability toward methyl orange (MO) in aqueous solutions. The kinetics of the adsorption process and the adsorption isotherm are investigated. The MO removal process is found to obey the Redlich-Peterson isotherm model, and its kinetics follows pseudo-second-order rate equation. In addition, the magnetic hybrid also exhibits good recycle ability for MO removal. This novel magnetic hybrid nanomaterial derived from GO/LDH hybrid demonstrates great potential in the applications of water treatment.
由还原氧化石墨烯、零价镍和 NiAl 混合金属氧化物（rGO/Ni/MMO）组成的磁性杂化纳米材料通过在氮气气氛中煅烧氧化石墨烯（GO）/层状双氢氧化物（LDH）杂化物合成。结构表征表明，在 GO 基底的存在下，NiAl-LDH 在煅烧过程中可以被还原为零价 Ni 和 NiAl-MMO。透射电子显微镜（TEM）用于研究所制备的杂化纳米材料的形态，表明引入 GO 基底可以防止 LDH 的聚集。磁性表征证明了 rGO/Ni/MMO 杂化的铁磁性。这种磁性杂化纳米材料在水溶液中对甲基橙（MO）表现出优异的吸附能力。研究了吸附过程的动力学和吸附等温线。发现 MO 的去除过程符合 Redlich-Peterson 等温模型，其动力学遵循拟二级速率方程。此外，磁性杂化对 MO 的去除也表现出良好的可回收能力。这种源自 GO/LDH 杂化的新型磁性杂化纳米材料在水处理应用中具有巨大的潜力。
