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SYNTHESIS OF A COMPOSITE AEROGEL OF REDUCED GRAPHENE OXIDE SUPPORTED BY TWO-DIMENSIONAL MONTMORILLONITE NANOLAYERS FOR METHYLENE BLUE REMOVAL
Clays and Clay Minerals ( IF 2.2 ) Pub Date : 2021-11-01 , DOI: 10.1007/s42860-021-00147-4
Qiulin Ma 1 , Ling Xia 1 , Shaoxian Song 1, 2 , Wei Wang 2 , Wei Ge 2
Affiliation  

Two-dimensional montmorillonite nanolayers (2D Mnt) are excellent adsorbents for methylene blue due to the fully exposed active sites, but the separation of 2D Mnt from water is difficult. The objective of the present study was to assemble 2D Mnt and graphene oxide sheets into a three-dimensional aerogel (3D Mnt-rGO Gel) to achieve easy solid–liquid separation. Structural characterization demonstrated that the Mnt-rGO Gel has a porous 3D structure with Mnt nanolayers distributed uniformly within; the introduction of 2D Mnt could reduce significantly the degree of restacking of graphene sheets. Adsorption tests indicated that 2D Mnt enhances the methylene blue (MB) removal performance of Mnt-rGO Gel with a large adsorption capacity of 207 mg g–1, which may be attributed to the adsorption of MB onto 2D Mnt and the increased adsorption surface of rGO resulting from the reduced restacking of graphene sheets. The MB was removed completely by 300 mg L–1 of Mnt-rGO Gel-3 in 180 min. The adsorption process of MB onto Mnt-rGO Gel followed the pseudo-second order kinetic model and the Langmuir isotherm model. Mnt-rGO Gel also showed good reusability. Fourier-transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results suggested that the adsorption of MB onto Mnt-rGO Gel may be attributed to the π–π interactions between aromatic rings of MB and graphene, hydrogen bonding, and the electrostatic interactions between the nitrogen groups on the MB and oxygen-containing groups on the Mnt-rGO Gel.



中文翻译:

二维蒙脱石纳米层支持的还原氧化石墨烯复合气凝胶的合成用于去除亚甲蓝

由于完全暴露的活性位点,二维蒙脱石纳米层(2D Mnt)是亚甲蓝的优良吸附剂,但二维 Mnt 与水的分离很困难。本研究的目的是将 2D Mnt 和氧化石墨烯片组装成三维气凝胶(3D Mnt-rGO Gel),以实现轻松的固液分离。结构表征表明,Mnt-rGO 凝胶具有多孔 3D 结构,其中 Mn 纳米层均匀分布;2D Mnt 的引入可以显着降低石墨烯片的重新堆叠程度。吸附测试表明,2D Mnt 增强了 Mnt-rGO Gel 的亚甲基蓝 (MB) 去除性能,具有 207 mg g –1的大吸附容量,这可能归因于 MB 吸附到 2D Mnt 上以及由于石墨烯片的重新堆叠减少而导致 rGO 的吸附表面增加。MB在 180 分钟内被 300 mg L –1的 Mnt-rGO Gel-3完全去除。MB在Mnt-rGO凝胶上的吸附过程遵循准二级动力学模型和Langmuir等温线模型。Mnt-rGO Gel 也显示出良好的可重复使用性。傅里叶变换红外 (FTIR) 和 X 射线光电子能谱 (XPS) 结果表明 MB 在 Mnt-rGO 凝胶上的吸附可能归因于 MB 的芳环与石墨烯之间的 π-π 相互作用、氢键和MB 上的氮基团与 Mnt-rGO 凝胶上的含氧基团之间的静电相互作用。

更新日期:2021-11-01
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