摘要：Lanthanum is one of the rare earth elements, which exhibits potential high adsorption capacity for a series of organic and inorganic pollutants. In this research, a lanthanum modified magnetic adsorbent La-modified Fe3O4 was prepared by chemical co-precipitation and used for adsorptive removal of tetracycline (TC) from aqueous solution. At the adsorbent dosage of 5 mg in 50 mL solution, the uptake of TC achieved as much as 83.29 mg/g. The equilibrium adsorption data were fitted by Langmuir, Freundlich, Temkin, Redlich- Peterson and Koble-Corrigan models. The R2 values of Freundlich, Redlich-Peterson and Koble-Corrigan models were higher than those of Langmuir and Temkin models. This indicates the chemisorption occurring on heterogeneous adsorbent surface. At 298, 308 and 318 K, the qmax values by Langmuir model were of 110.4, 145.9 and 176.0 mg/g, respectively. Thermodynamic analysis indicates that H° and S° were 29.83 KJ/mol and 124 J·mol-1·K-1, respectively. This demonstrates that the adsorption process was spontaneous and endothermic in nature.
