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合成氧化铁、氧化锰及其复合物,采用SEM研究其结构特征.以氧化铁、氧化锰及其复合物为吸附剂研究投量、pH值、时间等因素对吸附As(Ⅴ)的影响,并讨论As(Ⅴ)的饱和吸附量及等温吸附实验.吸附过程中,增加矿物投量可以明显提高砷的吸附率,但单位吸附量却随投量的增加呈先增后减的趋势;吸附量随p H值的增大呈先增后减的趋势.吸附速率在反应前40 min较高,逐渐降低后在100 min左右达到平衡,动力学曲线符合准二级动力学模型.Langmuir方程可以很好地描述吸附过程,由Langmuir方程计算出氧化铁、氧化锰及其复合物(Ⅰ、Ⅱ)的饱和吸附量分别为:62.5、44.6、103.1和114.9 mg/g.
The synthesis of iron oxide, manganese oxide and their complexes were studied by SEM, and the effects of dosage, pH value and time on the adsorption of As (Ⅴ) were investigated by using iron oxide, manganese oxide and their complexes as adsorbents, The adsorption capacity of As (Ⅴ) and its isothermal adsorption experiment were also discussed.The adsorption rate of arsenic increased obviously with increasing the amount of mineral in the adsorption process, but the unit adsorption capacity increased firstly and then decreased with the increase of input amount. The adsorption rate increased first and then decreased with the increase of pH value.The adsorption rate was higher at 40 min before the reaction and gradually decreased and then reached equilibrium at about 100 min.The kinetic curve was in accordance with the quasi-second-order kinetic model.Langmuir equation The adsorption process is very well characterized by Langmuir equation. The saturated adsorption capacities of iron oxide, manganese oxide and their complexes (Ⅰ, Ⅱ) are 62.5, 44.6, 103.1 and 114.9 mg / g, respectively.