摘要
以氧化石墨烯(GO)、丙烯酰胺和极性第二单体为原料,采用一步自由基聚合法制备了聚丙烯酰胺(PAM)/GO、阳离子聚丙烯酰胺(CPAM)/GO和阴离子聚丙烯酰胺(APAM)/GO复合水凝胶。利用FTIR、^(13)C NMR、拉曼光谱和XRD对复合水凝胶进行了表征,研究了复合水凝胶对Cr(Ⅵ)的吸附行为,分析了CPAM/GO吸附Cr(Ⅵ)的影响因素。实验结果表明,GO通过范德华力、物理包覆作用和氢键结合稳定分散在基体中。伪二阶动力学模型能更好地模拟复合水凝胶对Cr(Ⅵ)的吸附过程。Langmuir等温线是合适的等温拟合方式,Cr(Ⅵ)在复合水凝胶上的吸附是单层均质吸附。288 K下,CPAM/GO对Cr(Ⅵ)的吸附量高于APAM/GO和PAM/GO。在经过4个吸附-解吸循环后,CPAM/GO对Cr(Ⅵ)的平衡吸附量仍能保持80%。
Polyacrylamide(PAM)/graphene oxide(GO),cationic polyacrylamide(CPAM)/GO and anionic polyacrylamide(APAM)/GO composite hydrogels were prepared by one-step radical polymerization with GO,acrylamide and polar second monomer.The composite hydrogels were characterized by FTIR,13C NMR,Raman spectroscopy and XRD,the adsorption behavior of Cr(Ⅵ)by composite hydrogel was studied and the factors affecting the adsorption of Cr(Ⅵ)by CPAM/GO was studied.The results show that GO is stably dispersed in the matrix by van der Waals force,physical coating and hydrogen bonding.The pseudo second-order kinetic model can simulate the adsorption process of Cr(Ⅵ)by composite hydrogel better.The Langmuir isotherm is a suitable isothermal fitting method,and the adsorption of Cr(Ⅵ)on the composite hydrogel is a single layer homogeneous adsorption.At 288 K,CPAM/GO adsorbed Cr(Ⅵ)higher than APAM/GO and PAM/GO.After four adsorption-desorption cycles,the equilibrium adsorption capacity of Cr(Ⅵ)by CPAM/GO still keep 80%.
作者
邵亚辉
彭双双
彭晓宏
Shao Yahui;Peng Shuangshuang;Peng Xiaohong(College of Materials Science and Engineering,South China University of Technology,Guangzhou Guangdong 510640,China)
出处
《石油化工》
CAS
CSCD
北大核心
2020年第1期40-47,共8页
Petrochemical Technology
基金
广州市科技计划项目（201604020004）
