铵盐功能化氧化石墨烯的制备及其吸附性能

Synthesis and adsorption properties of quaternary ammonium salts functionalized graphene oxide

对Hummers法制备的氧化石墨烯进行碱处理去除表面的氧化碎片,经盐酸质子化和3-氨丙基三乙氧基硅烷硅烷化,与溴代正丁烷反应制备出表面带正电荷的铵盐功能化氧化石墨烯(PAS-bwGO),通过傅里叶红外光谱、拉曼光谱、X射线光电子能谱、场发射扫描电镜、透射电镜对其进行表征分析,并初步用于去除水中六价铬Cr(VI)的研究.结果表明,制备的铵盐功能化氧化石墨烯对Cr(VI)有很高的吸附性能,初步测得其饱和吸附量达到102mg/g.

Graphene oxide prepared by Hummers method was firstly washed by alkali solution to remove oxide debris ad-hered on the surface, then was modified through protonation with hydrochloric acid, silanization reaction with（3-aminopropyl）triethoxysilane and quaternization reaction with N-butyl bromide to produce positive chargedprimary amine salt functionalized graphene oxide （PAS-bwGO）. PAS-bwGO was characterized and analyzed byFourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, field emissionscanning electron microscopy and transmission electron microscopy, and was used preliminary for removal ofchromium（VI） in aqueous solution. Results showed that the prepared PAS-bwGO had a high capacity of chromi-um（VI） adsorption, and the maximum adsorption capacity could reach 102 mg/g.