石墨烯负载零价纳米铁材料的合成及去除水中Cr(VI)的研究

以石墨粉为原料,采用改良Hummers方法合成石墨烯,然后通过液相还原法制备出石墨烯负载纳米铁材料(Graphene-supported nanoscale zero-valent iron,G-nZVI),借助扫描电子显微镜(SEM)、红外光谱分析仪(FTIR)进行表征,并以G-nZVI为反应材料,研究其对水体中Cr(VI)的去除效率,结果显示:室温下,当G-nZVI投加量为0.4g/L,Cr(VI)的初始浓度为20 mg/L,初始pH值为3.0时,Cr(VI)的去除率在2h内可以达到95%以上。G-nZVI具有磁性,使用后可通过外加磁力除去,以防对水体的二次污染,具有较好的应用前景。

Synthesis of Graphene-supported Nano Fe (0) and Removal of Cr(VI) from Aqueous Solution

Using graphite as the raw materials, graphene was firstly synthesizedby improved Hummers and then graphene supported zero valence Fe nano particles(G-nZVI) were successfully prepared by liquid phase reduction method. Using scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FTIR) for materials characterization,the efficiency of removalCr(VI) from water by G-nZVI was studied.The results showed that at room temperature, more than 95% of Cr(VI) was removed from aqueous solution within 2 hours,when the G-nZVI addition amount was 0.4 g/L,an initial Cr(VI) concentration was 20 mg/L and the initial pH value was 3.0. Since G-nZVI is magnetic, so it can be removed by external magnetic force in order to prevent repeated pollution of water, which has good application prospects.