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以化学挂膜方法制备出来的活性铁锰氧化物滤膜为研究对象,考察其表面特性及除砷性能。结果表明,应用准二级反应动力学方程(R~2=0.922)能够表征该活性铁锰复合氧化物对As(Ⅴ)的吸附过程;吸附等温线符合Langmuir方程(R~2=0.971),其饱和吸附容量为11.94 mg/g;活性铁锰氧化物滤膜的pH_(zpc)在2.5左右;天然地下水体中的碳酸根对该吸附剂的吸附除砷效果有较强的抑制作用,而其余共存阴、阳离子在中性水环境中对除砷的效果影响不大。在柱试验过程中,As(Ⅴ)浓度分别为200、280μg/L的地下水通过该滤柱处理后最终出水砷浓度均降为零,除砷效果较好。
The active iron-manganese oxide membrane prepared by the chemical hanging-film method was used as the research object to investigate the surface properties and the performance of removing arsenic. The results showed that the adsorption kinetics of As (Ⅴ) by the quasi - second order reaction kinetic equation (R ~ 2 = 0.922) can be characterized by the Langmuir equation (R ~ 2 = 0.971) The saturated adsorption capacity was 11.94 mg / g. The pH zpc of the active Fe-Mn oxide membrane was about 2.5. The carbonate in natural groundwater had a strong inhibitory effect on the adsorption and arsenic removal of the adsorbent. The remaining coexistence of anion and cation in neutral water environment has little effect on the removal of arsenic. During the column test, the concentration of As (Ⅴ) was 200, 280μg / L of groundwater through the filter column after the final effluent arsenic concentrations were reduced to zero, arsenic removal better.