Wu Lili, Li Mengke, Li Mu, Sun Qiyue, Zhang Chaocan
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Polymers (Basel). 2020 Jun 26;12(6):1426. doi: 10.3390/polym12061426.
Graphene oxide (GO) have been reported as adsorbent materials, because its surface contains a large number of oxygen-containing groups, which provide masses of active sites. Nevertheless, it is difficult to separate GO from aqueous solution by conventional means after the end of the adsorption process. Therefore, ethylene diamine-reduced graphene oxide/anionic polyacrylamide (E-RGO/APAM), with a large quantity of adsorption sites and strong flocculation was prepared in this study. The composite E-RGO/APAM was characterized by Fourier transform infrared (FTIR), laser Raman spectrometer (IR), scanning electron microscope (SEM). The obtained results indicated that amino groups were successfully introduced into GO. Particle size test showed that the particle size of E-RGO/APAM is up to three micrometers, which can be separated from the water by conventional means, such as filtration and centrifugation, to avoid secondary pollution. The efficiency of E-RGO/APAM for removing Pb(II) was tested. The results showed that the process of adsorption of Pb(II) by E-RGO/APAM can be fitted by pseudo second order kinetic equation, indicating that the adsorption rate of the adsorbent depends on the chemisorption process, and the theoretical maximum adsorption amount of E-RGO/APAM is 400.8 mg/g. Based on these results, it can be stated that E-RGO/APAM is effective in the removal of Pb(II) from aqueous solutions, and provides a new method for the removal of heavy metal ions from industrial wastewater.
氧化石墨烯（GO）已被报道作为吸附材料，因为其表面含有大量含氧基团，这些基团提供了大量的活性位点。然而，在吸附过程结束后，用传统方法很难将GO从水溶液中分离出来。因此，本研究制备了具有大量吸附位点和强絮凝作用的乙二胺还原氧化石墨烯/阴离子聚丙烯酰胺（E-RGO/APAM）。通过傅里叶变换红外光谱（FTIR）、激光拉曼光谱仪（IR）、扫描电子显微镜（SEM）对复合E-RGO/APAM进行了表征。所得结果表明氨基已成功引入到GO中。粒度测试表明E-RGO/APAM的粒径可达三微米，可通过过滤和离心等传统方法从水中分离出来，以避免二次污染。测试了E-RGO/APAM去除Pb（II）的效率。结果表明，E-RGO/APAM对Pb（II）的吸附过程可用伪二级动力学方程拟合，表明吸附剂的吸附速率取决于化学吸附过程，E-RGO/APAM的理论最大吸附量为400.8mg/g。基于这些结果，可以说E-RGO/APAM在从水溶液中去除Pb（II）方面是有效的，并为从工业废水中去除重金属离子提供了一种新方法。
