硫脲改性榴莲壳对水溶液中Pb2+、Cd2+的吸附研究

摘要

The new modified durian shell (DS) adsorbent was prepared by using thiourea, the adsorption behavior of Pb2 + and Cd2 + on du-rian shell was studied. The result showed that pH 6.0 and shaking time 60 min were the optimal conditions for adsorption of Pb2 * and Cd2 + . The adsorption capacity of adsorbent could be greatly improved after modified. The maximum adsorption capacity of Pb2 + and Cd2 + reached up to 53.63 and 34.84 mg · G , respectively. The adsorption process followed a pseudo-second order equation and the equilibrium isotherm was described by the Langmuir model rather than by the Freundlich model.%采用硫脲改性榴莲壳,制备新型的改性榴莲壳吸附剂,研究其对Pb2、Cd2+的吸附性能.结果表明,吸附Pb2+、Cd2+的适宜条件为:pH6.0,吸附时间60 min.改性后榴莲壳吸附剂对Pb2、Cd2+的吸附容量能有了很大程度的提高,Pb2、Cd2最大吸附量分别达到53.63、34.84 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.