银胶菊杂草对镉（II）的吸附研究：废水中镉（II）的去除与回收
Adsorption studies on Parthenium hysterophorous weed: removal and recovery of Cd(II) from wastewater.
作者信息
Ajmal Mohammad, Rao Rifaqat Ali Khan, Ahmad Rais, Khan Moonis Ali
机构信息
Environmental Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, UP, India.
出版信息
J Hazard Mater. 2006 Jul 31;135(1-3):242-8. doi: 10.1016/j.jhazmat.2005.11.054. Epub 2006 Jan 4.
The efficiency of parthenium weed as an adsorbent for removing Cd(II) from water has been studied. Parthenium is found to exhibit substantial adsorption capacity over a wide range of initial Cd(II) ions concentration. Effect of time, temperature, pH and concentration on the adsorption of Cd(II) was investigated by batch process. Pseudo-first-order and Pseudo-second-order models were evaluated. The kinetics data for the adsorption process obeyed second-order rate equation. The equilibrium data could be described well by the Langmuir and Freundlich isotherms. Thermodynamic parameters such as DeltaH degrees , DeltaS degrees and DeltaG degrees were calculated. The adsorption process was found to be endothermic and spontaneous. The maximum adsorption of Cd(II) ions (99.7%) in the pH range 3-4 indicated that material could be effectively utilized for the removal of Cd(II) ions from wastewater. The desorption studies showed 82% recovery of Cd(II) when 0.1 M HCl solution was used as effluent.
已对银胶菊作为从水中去除镉（II）的吸附剂的效率进行了研究。发现银胶菊在很宽的初始镉（II）离子浓度范围内都表现出相当大的吸附容量。采用分批处理法研究了时间、温度、pH值和浓度对镉（II）吸附的影响。对伪一级和伪二级模型进行了评估。吸附过程的动力学数据符合二级速率方程。平衡数据可用朗缪尔等温线和弗伦德利希等温线很好地描述。计算了诸如ΔH°、ΔS°和ΔG°等热力学参数。发现吸附过程是吸热的且自发的。在pH值为3 - 4的范围内，镉（II）离子的最大吸附率为99.7%，这表明该材料可有效地用于从废水中去除镉（II）离子。解吸研究表明，当使用0.1 M盐酸溶液作为流出液时，镉（II）的回收率为82%。
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