作　　者： ; ; ; ; ; ;

机构地区： 华东师范大学资源与环境科学学院环境科学系

出　　处： 《江苏环境科技》 2007年第2期1-4,共4页

摘　　要： 研究了Pb(Ⅱ)离子在浦东机场滩涂沉积物上的吸附行为,探讨了pH值和温度对吸附作用的影响,绘制了不同温度下的吸附等温线,并讨论了其吸附热力学性质和吸附机理。实验结果表明,常温下Pb(Ⅱ)在滩涂沉积物上的吸附平衡时间约需2.5h;在实验的pH值和温度范围内,Pb(Ⅱ)的吸附量随pH值和温度的升高而升高。Langmuir和Freundlich方程能较好的对吸附数据进行拟合。热力学分析表明:△H>0,说明吸附是吸热过程;△G<0,表明吸附的自发性;△S>0表明固-液界面上分子运动更为混乱。 The sorption behaviors of Pb （Ⅱ） on tidal flat sediments at pudong airport were studied in this paper. The effects of pH and temperature on the sorption were mainly discussed. The sorption isotherms were drawn at different temperatures, and the sorption thermodynamic properties and the sorption mechanism were also studied. The results showed that sorption equilibration time was about 2.5 hours at normal atmospheric temperature. Generally speaking, the sorption capacity increased with the increase of pH and temperature. The sorption behaviors of Pb（Ⅱ） on tidal flat sediments at pudong airport could be well described by Langumuir and Freundlich sorption isotherm equatons. Thermodynamic study showed that the positive value of △H indicated an endothermic process, the negative value of △G indicated the spontaneous nature of the adsorption process, and the positive value of △S indicated the increased randomness at the solid-solution interface during the adsorption process.

关 键 词： 沉积物 吸附

领　　域： [环境科学与工程]