日韩av在线高清免费毛片日韩欧美一级成人|女人18以后毛片|国产18女人毛多水多毛片|乱系列人妻视频|中文字幕久久熟女人妻av|91麻豆人妻|校花被我玩弄|父女乱荡|高潮videossex潮喷另类|日本在线观看人妻,黑人侵犯日本人妻,色哟哟视频线在线播放欧美,亚洲欧美国产国产一区第二页

作者：Thomas M.McCoy^a, Huw C.W.Parksa^b, Rico F.Tabor^a

^aSchool of Chemistry, Monash University, Clayton, 3800, Australia

^bSchool of Chemistry, Cardiff University, Cardiff, CF10 3AT, United Kingdom

摘要：In this work, it is shown that graphene oxide (GO) sheets can be effectively recovered from aqueous solution by a simple froth flotation method. Small amounts of cetyltrimethylammonium bromide (CTAB) are added to assist with flocculating and driving the GO to the air–water interface, then ultrasonication is employed to form a foam that entrains the GO. The surfactant is essential in this process by firstly destabilising the GO dispersion through surface charge neutralisation, allowing the particles to aggregate. Furthermore, the hydrophobic component of the adsorbed surfactant molecules enhances adsorption of the GO at the air–water interface. Positioning the sonicator tip precisely at the air–water interface is crucial for foam formation by ensuring air bubbles are entrained into the sample. The nature of the foam can also be manipulated by altering the sonication intensity or by incorporating additional surfactant additives. At ideal GO:CTAB ratios, almost full removal (99%) of the GO from an aqueous dispersion is achieved, with minimal overall change in the particle size distribution of the GO. It is shown that this process can also be used when GO is employed as an adsorbent for removing toxic metals and organic species from aqueous solution.