酸性品红在石墨烯上的吸附平衡和吸附动力学研究  

ADSORPTION EQUILIBRIUM AND KINETICS OF ACID FUCHSINE ON GRAPHEME

作　　者：常兰[1,2] 秦伟超[3] 

机构地区：[1]成都理工大学工程技术学院,四川乐山614007 [2]核工业西南物理研究院,四川成都610041 [3]东北师范大学环境学院,吉林长春130117

出　　处：《水处理技术》2014年第7期16-19,共4页Technology of Water Treatment

基　　金：四川省教育厅项目(14ZB0353)

摘　　要：用透射电子显微镜对制备得到的石墨烯进行了表征,探讨了反应时间、吸附剂用量和染料初始浓度等对吸附酸性品红效果的影响,采用Langmuir和Freundlich等温吸附模型对吸附平衡进行拟合,又用准一级动力学方程和准二级动力学方程描述石墨烯对酸性品红的吸附动力学过程。结果表明,在石墨烯对AF的吸附,在前10 min内反应速率很快,约在60min内达到吸附平衡,最适的吸附剂投加量为30 mg。准二级动力学模型和Langmuir等温吸附模型能较好描述石墨烯对AF的吸附过程,最大吸附量为62.112 mg/g,计算结果表明该吸附是一种单分子层吸附为主的化学过程。The characteristics of grapheme were characterized by transmission electron microscopy. The effects of factors including contact time,dosage on the adsorption properties of acid fuchsine onto grapheme were investigated. The data was fitted with Langmuir and Freundlich models to describe the equilibrium isotherms. The kinetics rates were modeled using pseudo-first-order and pseudo-second-order kinetic equations. The results revealed that the adsorption processes were rapid within the first 10 min and reached equilibrium in about 60 min. The optimal amount of adsorbent was 30 mg. The adsorption kinetics fitted well with the pseudo-second-order model and the adsorption equilibrium fit to Langmuir adsorption isotherm. The adsorption capacity of AF on grapheme inferred from the Langmuir model was 62.112 mg/g. The calculated thermodynamic parameters show that the adsorption of AF onto grapheme were monomolecular chemical adsorption process.

关 键 词：酸性品红 石墨烯 吸附动力学 

分 类 号：TQ424[化学工程]