石墨烯改性有机膨润土颗粒的制备与表征

Preparation and characterization of organobentonite granules modified with graphene

为改善膨润土在水处理中固液分离困难的问题,采用微波法,以石墨烯对有机膨润土进行改性,并利用聚乙烯醇(PVA)为粘结剂、淀粉为造孔剂,经高温焙烧制备石墨烯改性有机膨润土颗粒(CTMAB-GMBG、OTACGMBG)。利用EDS、FT-IR、SEM、XRD、BET等手段对样品进行表征分析,以明确制备过程对石墨烯改性有机膨润土颗粒内部构造变化的影响。结果表明,石墨烯与有机膨润土复合成功,石墨烯中的羧基与季铵盐离子形成了酰胺键,石墨烯改性有机膨润土颗粒的层间距由1.265nm增大至2.480nm(CTMAB-GMBG)、2.708nm(OTAC-GMBG),比表面积分别增大至60.3506m^2/g(CTMAB-GMBG)和51.3482m^2/g(OTAC-GMBG),且颗粒的孔隙结构优化明显。

In order to improve the effect of powder bentonite in solid-liquid separation for water treatment,graphene modified organobentonite granules（CTMAB-GMBG,OTAC-GMBG）were prepared.Graphene was chosen to modify powdery organobentonite under microwave.The granules were prepared by mixing with polyvinyl alcohol（PVA）as binder and starch as pore former under roasting.The samples were characterized by EDS,FT-IR,SEM,XRD and BET to confirm how the process of preparation would affect the internal structure of GMBG.The results showed that graphene and organobentonite were uniformly composited and the key bonds were formed between the frameworks of organobentonite.The basal spacing increased from 1.265 nm to 2.480 nm（CTMAB-GMBG）and 2.708 nm（OTACGMBG）,the surface area went up to 60.3506 m^2/g（CTMAB-GMBG）and 51.3482 m^2/g（OTAC-GMBG）respectively,while the pore structure of GMBG was evidently improved by granulation.