二乙烯三胺改性山竹壳吸附水溶液中的Cd^(2+),Pb^(2+)

Adsorption of Cd^(2+) and Pb^(2+) from aqueous solutions by diethylenetriamine modified mangosteen shell

采用二乙烯三胺改性山竹壳,制备新型改性山竹壳吸附剂,研究其对Cd2+,Pb2+的吸附性能.结果表明,吸附Cd2+,Pb2+的适宜条件为:pH值6.0,吸附时间120 min.改性后山竹壳吸附剂对Cd2+,Pb2+的吸附容量能有很大程度的提高,Cd2+,Pb2+最大吸附量分别达到20.49,37.04 mg·g-1.吸附过程可以很好地用准二级动力学方程描述,吸附等温线用Langmuir方程的拟合效果优于Freundlich方程.

The new modified mangosteen shell（MS）adsorbent has been prepared by using diethylenetriamine and the adsorption behavior of Cd2＋ and Pb2＋ on mangosteen shell was studied.It showed that pH 6.0 and shaking time 120 min were the optimal conditions for adsorption of Cd2＋ and Pb2＋.The adsorption capacity of adsorbent can be greatly improved after modified.The maximum adsorption capacity of Cd2＋and Pb2＋reached up to 20.49 and 37.04 mg.g-1,respectively.The adsorption process followed a pseudo-second order equation and the equilibrium isotherm was best described by the Langmuir model rather than the Freundlich model.