具有优异循环性能的三维石墨烯气凝胶对有机染料的有效去除

丁月玲; 田真; 李慧君; 王晓敏

doi:10.1016/S1872-5805(19)60017-X

具有优异循环性能的三维石墨烯气凝胶对有机染料的有效去除

doi: 10.1016/S1872-5805(19)60017-X

1.
太原理工大学材料科学与工程学院, 山西太原 030024;
2.
太原理工大学山西省新能源材料与器件重点实验室, 山西太原 030024

基金项目: 国家自然科学基金（U1710256，51572184）.

详细信息

作者简介:
丁月玲,硕士.E-mail:2513805218@qq.com

通讯作者:
王晓敏,教授.E-mail:wangxiaomin@tyut.edu.cn

中图分类号: TQ127.1⁺1
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- 文章访问数: 361
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- 被引次数: 0
出版历程
- 收稿日期: 2019-05-30
- 录用日期: 2019-09-10
- 修回日期: 2019-07-29
- 刊出日期: 2019-08-28

Efficient removal of organic dyes using a three-dimensional graphene aerogel with excellent recycling stability

1.
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.
Shanxi Key Laboratory of New Energy Materials and Devices, Taiyuan University of Technology, Taiyuan 030024, China

Funds: National Natural Science Foundation of China (U1710256, 51572184). Corresponding authors:WANG Xiao-min, Professor. E-mail:wangxiaomin@tyut.edu.cn

摘要

摘要: 以聚乙烯醇（PVA）为交联剂，采用一步水热法和冷冻干燥法制备了氮掺杂石墨烯气凝胶（N-GA）。PVA的加入使GA的三维多孔结构更加稳定，提高了GA的循环性能。氮源的加入为染料的吸附提供了较多的的吸附位点。在pH=8和pH=2时，PVA-N/GA对亚甲基蓝（MB，98.39%）和甲基橙（MO，78.78%）表现出优异的吸附能力。MB和MO的吸附过程符合准二阶动力学模型，且遵循单层朗缪尔等温线模型和多层弗伦德里希等温线模型。此外，PVA-N/GA具有良好的可重复性。PVA-N/GA对染料的吸附主要归因于π-π键，氢键和静电相互作用。
- 三维多孔结构 /
- 石墨烯气凝胶 /
- 染料 /
- 吸附 /
- 循环能力
Abstract: The development of a renewable absorbent with a high adsorption efficiency is of great importance for the purification of dye wastewater. A nitrogen-doped graphene aerogel (N-GA) was prepared by a one-step hydrothermal and freeze-drying method using polyvinyl alcohol (PVA) as a cross-linking agent. Results indicated that the nitrogen doping provided more adsorption sites for the dyes. The PVA-N-GA showed excellent adsorption efficiencies for methylene blue (MB) (98.39% at pH=8) and methyl orange (MO) (78.78% at pH=2). The adsorption kinetic data of MB and MO on the PVA-N-GA were better fitted with a pseudo-second-order kinetic model than a pseudo-first-order kinetic model while the adsorption isotherms of MB and MO were better described by the monolayer Langmuir model and the multilayer Freundlich model, respectively. The PVA-N-GA showed excellent recycling stability with a negligible decay of adsorption efficiency after five cycles, which was ascribed to PVA making the three-dimensional (3D) pore structure of the N-GA more stable. The adsorption of the PVA-N-GA for dyes was mainly attributed to the π-π bonds, hydrogen bonds and electrostatic interactions.
- Three-dimensional porous structure /
- Graphene aerogel /
- Dyes /
- Adsorption /
- Recycle ability

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