A novel La–Mg composite was prepared for the removal of low concentration phosphate and ammonium nitrogen to alleviate the eutrophication problem. The composition and morphology of La–Mg composite was characterized; Its surface was composed of La, Mg, C, and O elements, with a specific surface area of 21.92 m²/g. La–Mg composite presented excellent removal of phosphate (100%) and nitrogen (96.8%), and the adsorption capacity reached 49.72 mg-P/g and 159.30 mg-N/g for separated adsorption. The composite also had a wide pH usability range (3–11 for P and 3–9 for N) and the adsorption process was almost not disturbed by coexisting ions. After adsorption, it could be regenerated by Na₂CO₃ and reused effectively. For actual water treatment, a very low residual P of 0.01 mg/L and N of 0.05 mg/L were achieved. Furthermore, Mechanism analysis showed that P adsorption involved ligand exchange and electrostatic attraction. The potential mechanisms of N adsorption involved electrostatic attraction and ion exchange. The results showed that the La–Mg composite is a novel and efficient adsorbent for actual water treatment to achieve ultra-low nutrients concentration.

制备了一种新型的La-Mg复合材料，用于去除低浓度的磷酸盐和铵态氮，以减轻富营养化问题。表征了La-Mg复合材料的组成和形貌。其表面由La，Mg，C和O元素组成，比表面积为21.92 m ² / g。La–Mg复合材料对磷酸盐（100％）和氮（96.8％）的去除效果极好，分离分离的吸附容量分别为49.72 mg-P / g和159.30 mg-N / g。该复合材料的pH可用性范围也很广（P为3-11，N为3-9），并且吸附过程几乎不受共存离子的干扰。吸附后可以被Na ₂ CO ₃再生并有效地重复使用。对于实际的水处理，获得了非常低的残留P（0.01 mg / L）和N（0.05 mg / L）。此外，机理分析表明，P吸附涉及配体交换和静电吸引。氮吸附的潜在机理涉及静电吸引和离子交换。结果表明，La-Mg复合材料是一种新颖且有效的吸附剂，可用于实际水处理以实现超低养分浓度。