颗粒态铁锰复合氧化物对磷的吸附特征及影响因素

发布时间：2019-08-05 18:14

【摘要】：以聚乙烯醇(PVA)为黏合剂,将FeSO_4和KMnO_4以摩尔比5∶1复合制备了颗粒态铁锰复合氧化物,采用扫描电镜和红外光谱对其进行表征,并考察了其对溶液中磷的吸附特征及影响因素。结果表明,颗粒态铁锰复合氧化物表面粗糙、孔隙结构发达,含有丰富的表面基团;颗粒态铁锰复合氧化物对水中的磷具有良好的吸附效果,对磷的吸附量随时间增加而增大,400min时可达吸附平衡,准二级动力学方程能较好地描述该吸附动力学过程;Langmuir方程可较好地拟合不同温度时的等温吸附数据,且反应温度越高,平衡吸附量越大;离子强度变化及NO_3~ ,SiO_3~(2 ),SO_4~(2 )和CO_3~(2 )等共存离子存在对颗粒态铁锰复合氧化物的吸附除磷过程影响不大;pH可显著影响颗粒态铁锰复合氧化物对磷的去除效果,pH≤5时磷的去除率较高且基本保持不变,pH5时去除率随pH升高而降低。
[Abstract]:Using polyvinyl alcohol (PVA) as adhesive, particulate Fe-mn composite oxide was prepared by using FeSO_4 and KMnO_4 at molar ratio of 5:1. The composite oxide was characterized by scanning electron microscope (SEM) and infrared spectroscopy (IR). The adsorption characteristics and influencing factors of phosphorus in solution were investigated. The results show that the surface of the particulate Fe-mn composite oxide is rough, the pore structure is developed, and it contains rich surface groups. The particulate Fe-mn composite oxide has a good adsorption effect on phosphorus in water, the adsorption capacity of phosphorus increases with the increase of time, and the adsorption equilibrium can be reached at 400min. The quasi-second-order kinetic equation can well describe the adsorption kinetic process. The Langmuir equation can well fit the isotherm adsorption data at different temperatures, and the higher the reaction temperature is, the greater the equilibrium adsorption capacity is, and the change of ion strength and the existence of co-existing ions such as NO_3~, SiO_3~ (2 /), SO_4~ (2 /) and CO_3~ (2 /) have little effect on the adsorption and phosphorus removal process of particulate Fe-mn composite oxides. PH can significantly affect the removal efficiency of phosphorus by particulate Fe-mn composite oxides. The removal rate of phosphorus is high and basically unchanged at pH 鈮，

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