废旧锌锰电池回收制备菱形三氧化二锰及其对染料吸附性能研究

Preparation of diamond polyhedron Mn_2O_3 from spent zinc-manganese battery and its adsorption performance for dye

提取废旧锌锰电池中的锰氧化物灼烧制备Mn_2O_3,利用X射线衍射分析仪和扫描电子显微镜对产物进行表征。通过系列吸附实验探究Mn_2O_3作为吸附剂对甲基橙和茜素红染料的吸附机理和最佳吸附条件。结果表明,产物是粒径为500~1 000 nm的菱形多面体结构Mn_2O_3,对甲基橙和茜素红的吸附动力学均符合准二级动力学方程,热力学均符合Langmuir吸附方程;在最佳吸附条件pH值为2、吸附时间180 min、染料初始浓度为30 mg/L、Mn_2O_3投加量分别为24.62,35.56 g/g时,甲基橙和茜素红的吸附效果最佳。

Mn2O3 was prepared by calcining manganese oxides obtained from spent zinc-manganese dry battery,and the sample was characterized by X-ray diffraction（ XRD） and scanning electron microscopy（ SEM）. The adsorption mechanism and optimum adsorption conditions of Mn2O3 for the methyl orange and Alizarin red were studied through a series of adsorption experiments. The results show that the product Mn2O3 is diamond polyhedron with a diameter of 500 ~ 1 000 nm,the adsorption kinetics of Mn2O3 for the methyl orange and Alizarin red are both in accordance with the pseudo-second-order kinetic equation and adsorption thermodynamics are in accordance with Langmuir isotherm formula. The optimum adsorption effect achieves under the optimum conditions of pH 2,adsorption time 180 min,initial concentration30 mg/L,Mn2O3 dosage 24. 62,35. 56 g/g respectively.