论文部分内容阅读
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,并用红外光谱(FTIR)、X射线粉末衍射(XRD)、透射电镜(TEM)进行了表征,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。结果表明,293 K时,在pH=5,初始质量浓度为200 mg/L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。动力学实验表明,该吸附行为符合二级动力学方程,吸附等温线能较好地符合Langmuir等温方程式。
The walnut shell loaded nano zero valent iron was prepared by liquid phase chemical reduction method using walnut shell powder, NaBH4 and FeCl2 · 4H2O as raw materials and characterized by FTIR, XRD and TEM The characterization was carried out to study the adsorption of Pb2 + in aqueous solution by loading nano-zero iron walnut shell as adsorbent. The results showed that at 293 K, the maximum adsorption capacity of Pb2 + for the 10 mg adsorbent was 199.90 mg / g at pH = 5 and initial concentration of 200 mg / L. Kinetic experiments show that the adsorption behavior accords with the second-order kinetic equation, and the adsorption isotherms can well fit the Langmuir isothermal equation.