【摘要】 采用一步共沉淀技术制备了低成本的磁性铁锆氧化物/坡缕石(MZIO/PG)吸附剂，研究了吸附剂对水中磷的吸附性能，对吸附过程的动力学特征、吸附平衡的热力学参数及吸附机理进行了探讨。结果显示，MZIO/PG复合吸附剂基本上保持了磁性铁锆氧化物的表面性质和结构，吸附磷的容量可达到磁性铁锆氧化物的90%以上，吸附过程符合pseudo-second-order动力学模型，Langmuir方程、Freundlich方程及D-R方程均可描述吸附平衡，单层饱和吸附量为36.63 mg/g,平均吸附能为19.4 kJ/mol, pH值升高会抑制吸附作用，离子强度对吸附的影响较小，吸附有较好的选择性，吸附剂容易再生并可有效地重复使用，通过吸附机理分析发现吸附剂表面的羟基和磷酸盐之间发生离子交换并形成了内层配合物。更多还原

【Abstract】 Magnetic zirconium-iron oxide/palygorskite(MZIO/PG) as a low-cost adsorbent were produced by facile one-step co-precipitation technique and its properties for phosphorus adsorption were investigated by batch adsorption experiments.The adsorption kinetics characteristics and thermodynamic parameters were analyzed with a discussion on the adsorption mechanism.The results indicated that MZIO/PG composite adsorbent almost completely maintained the surface properties and structure of iron zirconium oxide,and the adsorption capacity of phosphorus can reach more than 90% of that of iron zirconium oxide.The adsorption kinetic data followed the pseudo-secondorder model and Langmuir equation,Freundlich equation and D-R equation could all describe the adsorption equilibrium.The monolayer saturated adsorption capacity was 36.63 mg/g and the average adsorption energy is 19.4 kJ/mol.The increase in pH value impeded the adsorption and the ion strength has little effect on the adsorption.The adsorption had good selectivity and the adsorbent was easy to regenerate and effectively reused.The adsorption mechanism analysis found that ion exchange occurred between the surface hydroxyl of the adsorbent and phosphate groups,forming inner-sphere complexes.更多还原