新型炭材料2019，Vol.34Issue(4)：315-324,10.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
Efficient removal of organic dyes using a three-dimensional graphene aerogel with excellent recycling stability
摘要
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 pseudosecond-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.关键词
三维多孔结构/石墨烯气凝胶/染料/吸附/循环能力Key words
Three-dimensional porous structure/Graphene aerogel/Dyes/Adsorption/Recycle ability分类
化学化工引用本文复制引用
丁月玲,田真,李慧君,王晓敏..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[J].新型炭材料,2019,34(4):315-324,10.基金项目
国家自然科学基金(U1710256,51572184).National Natural Science Foundation of China (U1710256,51572184). （U1710256,51572184）
