核桃壳负载纳米零价铁吸附废水中Pb2 的研究

Study on Adsorption of Pb2 in Wastewater by Walnut Shell Supported-nZVIFe

摘要:

以核桃壳粉、NaBH4、FeCl2.4H2O为原料，采用液相化学还原法制备了核桃壳负载纳米零价铁，分析了其红外光谱(FT-IR)、X-粉末衍射（XRD）、透射电镜(TEM)，着重研究了负载纳米零价铁核桃壳作为吸附剂对水溶液中Pb2 的吸附。实验结果表明，293 K时，在pH为5，初始浓度是200 mg.L-1的水溶液中， 10 mg吸附剂对Pb2 离子的最大吸附量为199.90 mg g-1。动力学实验表明该吸附行为符合二级动力学方程，吸附等温线能较好的符合Langmuir等温方程式。

Abstract:

The walnut shell-supported-nano zero valent iron (walnut-nZVIFe) was prepared by NaBH4, FeCl2.4H2O and walnut shell using liquid phase chemical reduction. The materials were characterized by FT-IR, XRD and TEM. The walnut-nZVIFe to Pb2 was investigated. The results had indicated that the maximum adsorption capacity for Pb2 was 199.90 mg g-1 at 293K, pH 5.0 and the amount of the adsorbent was 10 mg when the initial concentration of Pb2 was 200 mg.L-1. The adsorption kinetics data indicated that the adsorption fitted well with the pseudo-second-order kinetic model. The adsorption isotherms of Pb2 could be well described by the Langmuir equation．