Phosphoric acid-functionalized mesoporous silica material was prepared by copolycondensation using P123 as the soft template and diethylphosphatoethyltriethoxysilane as the functional monomer. It was used for highly efficient selective adsorption and separation of La(III). By adjusting the ratio of the silicon source to functional monomer, the difference of the adsorption material structure and the change of adsorption performance were explored. When the ratio of the silicon source to functional monomer is 9/1, the phosphoric acid-functionalized SBA-15 (named S2) exhibits a highly ordered hexagonal cell structure. Saturated adsorption capacity of La(III) on S2 is 114.81 mg g^–1 at 25 °C and 7.0 pH, which is much larger than other reported adsorbents. In addition, the adsorbent S2 has excellent adsorption kinetics: the adsorption equilibrium can be quickly concluded within 60 min. The distribution coefficient (K_d) of S2 to La(III) is 725 mL g^–1, and that of Nd(III) and other ions is about 200 mL g^–1. This indicates that the phosphoric acid-functionalized adsorbent has strong selectivity in the process of adsorption and separation of La(III). Cyclic performance tests indicate that the adsorbent has excellent regenerability. The above results indicate that the phosphoric acid-functionalized SBA-15 adsorbent (S2) has a promising application in the actual adsorption separation of La(III).

中文翻译：

---

磷酸官能化SBA-15的制备及其对镧离子的高效选择性吸附分离

以P123为软模板，以二乙基磷酸乙基三乙氧基硅烷为功能单体，通过共缩聚反应制得磷酸官能化的介孔二氧化硅材料。它用于La（III）的高效选择性吸附和分离。通过调节硅源与功能单体的比例，探讨了吸附材料结构的差异和吸附性能的变化。当硅源与功能单体的比例为9/1时，磷酸官能化的SBA-15（命名为S2）表现出高度有序的六边形电池结构。La（III）在S2上的饱和吸附容量为114.81 mg g ^–1在25°C和7.0 pH下，比其他报道的吸附剂大得多。此外，吸附剂S2具有出色的吸附动力学：吸附平衡可在60分钟内迅速结束。S2在La（III）中的分布系数（K _d）为725 mL g ^–1，而Nd（III）和其他离子的分布系数（K _d）约为200 mL g ^–1。这表明磷酸官能化的吸附剂在La（III）的吸附和分离过程中具有很强的选择性。循环性能测试表明该吸附剂具有出色的可再生性。以上结果表明，磷酸官能化的SBA-15吸附剂（S2）在La（III）的实际吸附分离中具有广阔的应用前景。