掺铝α-FeOOH纳米微粒对铅离子吸附性能研究

Adsorption performance of Al-doped α-FeOOH nanoparticles to Pb^(2+)

采用金属离子化学共沉淀法制备掺铝α-FeOOH纳米微粒,通过透射电镜(TEM)和X射线衍射(XRD)对其进行表征,并研究了其对铅离子(Pb2+)的吸附性能。结果表明:制备的掺铝微粒为α-FeOOH,呈针状,是纳米级。Pb2+初始质量浓度、吸附时间对吸附效果均有不同程度的影响。掺铝α-FeOOH纳米微粒对Pb2+的吸附符合Langmuir模型,理论最大吸附量qm为5.043 mg/g。吸附过程可以用准二级动力学方程进行描述,准二级动力学速率常数k为0.088 g/(mg.min),平衡吸附量理论计算值qe为5.405 5 mg/g。

Al- doped α - Fe00H nanoparticles were prepared by metal-ion chemical coprecipitation method. Performances of Al - doped α - FeOOH nanopartieles were characterized by transmission-electronic microscope and X - ray diffraetometer, then its adsorption efficiency to Pb^2＋ was researched. Results showed that the prepared nanopartieles were α- FeOOH with nano-sized needle-like shape;and the adsorption efficiency was influenced by the initial mass concentration of Pb^＋ and adsorption time in different degrees. Adsorption of Pb^2 ＋ by Al - doped α - FeOOH nanoparticles followed Langmuir isotherm model, and the maximum adsorption capacity qm was 5. 043 mg/g. All absorption processes could be decribed by pseudo-second-order kinetics equation,in which the values of parameter k and qe were 0. 088 g/（ mg · min ） and 5. 405 5 mg/g respectively.