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基于铁基材料对砷的独特的亲合力及介孔材料的高比表面积,用水热法合成铁基介孔微球(Fe-MS),在对其进行系列表征后,考察了其吸附除砷效果。X射线衍射(XRD)和扫描电镜(SEM)表征结果均显示Fe-MS是非晶微球。N2吸附脱附分析结果表明,Fe-MS具有较大的比表面积(407 m2/g)且呈规整双孔径分布(3.7 nm与5.3 nm)。吸附As(V)研究结果显示,在pH=3~4,初始As(V)=100 ppb时,其去除率达99%以上;吸附等温线符合Langmuir方程;吸附动力学符合准二级动力学方程;Fe-MS对As(V)的吸附效率不受背景离子强度的影响,表明其吸附机理为稳定的球内络合作用。
Based on the unique affinity of iron-based materials for arsenic and the high specific surface area of mesoporous materials, iron-based mesoporous microspheres (Fe-MS) were synthesized by hydrothermal method. After characterization, effect. X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterization results show that Fe-MS is amorphous microspheres. N2 adsorption and desorption analysis results show that the Fe-MS has a large specific surface area (407 m2 / g) and a regular double pore size distribution (3.7 nm and 5.3 nm). Adsorption of As (V) showed that the removal rate was above 99% at pH = 3-4 and initial As (V) = 100 ppb. The adsorption isotherms fitted the Langmuir equation. The adsorption kinetics was in accordance with quasi-second order kinetics Equation. The adsorption efficiency of As (V) on Fe-MS was not affected by the background ionic strength, indicating that the adsorption mechanism of Fe-MS was stable intragranular complexation.