氨基硫脲改性山竹壳对Cd^(2+)、Pb^(2+)的吸附

Adsorption of Cd^(2+) and Pb^(2+) on Mangosteen Shell Modified by Thiosemicarbazide

采用氨基硫脲改性山竹壳,制备新型的改性山竹壳吸附剂,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 6.0,吸附时间120 min。改性后山竹吸附剂对Cd2+、Pb2+的吸附容量能有了很大程度的提高,Cd2+、Pb2+最大吸附量分别达到39.37、57.14mg/g。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。

New modified mangosteen（MS） adsorbent was prepared by using thiosemicarbazide and the adsorption behavior of Cd2＋ and Pb2＋ on mangosteen shell was studied.Results 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 could be greatly improved after modified,with the maximum adsorption capacity of Cd2＋ and Pb2＋ up to 39.37 and 57.14 mg/g 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.