摘要
本文以高比表面积、强吸附能力的碳纳米管为对象,研究水溶液中碳纳米管吸附对硝基苯酚的特性,采用FTIR和TEM对吸附结果进行了对比分析,探讨了初始浓度、温度等因素对吸附量的影响,测定了不同温度、浓度下的吸附量,分别采用Langmuir方程和Freundlich方程进行拟合,根据不同温度下的吸附等温线计算了吸附热力学函数ΔG、ΔH及ΔS,并据此探讨其可能的吸附机理。研究表明:吸附量随初始浓度的增加而增加,碳纳米管对对硝基苯酚的吸附符合Freundlich方程,吸附为放热、熵增的自发过程,具有物理吸附特征。
Due to its high specific surface area,carbon nanotubes(CNTs) have strongly adsorpting property.The thermodynamics properties and mechanism were studied for adsorpting P-nitrophenol in aqueous solution with carbon nanotubes.Purification and adsorption sample are tested by Transmission Electron Microscope and Fourierit-Infared Spetroscopy.The effects of concentration and temperature on the adsorption are discussed.The results show that the adsorption of P-nitrophenol in aqueous solution is accorded with Freundlich and Langmuir equations.Adsorption is increased with concentration and reduced with temperature.Freundlich equation is suiteder to describing the adsorpting reaction.The adsorption for P-nitrophenol on CNTs is proved to be a spontaneous,exothermal process with increasing entropy and is physical adsorption.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2009年第S1期219-223,共5页
Journal of Synthetic Crystals
基金
总装备部预研基金(项目批准号:9140A05090107BQ0116)
关键词
碳纳米管
吸附
对硝基苯酚
热力学
等温线
carbon nano-tubes
absorption
p-nitrophenol
thermodymatics
adsorption isotherms
