Abstract: Lanthanum has been successfully loaded on diatomite by getting through supersonic mixing,drying and calcination processes. Its structure and shape have been characterized by means of XRD,SEM and N₂ adsorption-desorption curve, and the adsorption characteristics for phosphate investigated through systematical adsorption experiments. The characterization results indicate that the lanthanum-containing compound is lanthanum oxygen carbonate, which is loaded evenly on the surface of diatomite. The adsorption results show that the phosphate radicals can be adsorbed by D-La quickly,and reach adsorption equilibrium within 2 h,the adsorption kinetic curve conforms to pseudo second-order kinetic model, and Langmuir model can fit adsorption isotherm of D-La for phosphorus better, and the maximum adsorption capacity of D-La for phosphorus is 80.90 mg/g.

Key words: diatomite, lanthanum, phosphate, adsorption

摘要： 经超声混合、干燥和煅烧，在硅藻土上负载镧（D-La）。采用XRD、SEM和N₂吸脱附曲线表征其结构和形貌，通过系列吸附实验研究其对磷的吸附特性。表征结果表明，含镧化合物为碳酸氧镧（La₂O₂CO₃），均匀地负载在硅藻土表面。吸附结果表明，D-La能对磷酸根快速吸附，2 h内基本达到吸附平衡，吸附动力曲线符合拟二级动力学模型，Langmuir模型能更好地拟合D-La对磷的吸附，D-La对磷的最大吸附量为80.90 mg/g。

关键词: 硅藻土, 镧, 磷, 吸附

CLC Number: 

• X703.1