School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
J Colloid Interface Sci. 2022 May 15;614:478-488. doi: 10.1016/j.jcis.2022.01.149. Epub 2022 Jan 24.
Severe water eutrophication due to large releases of phosphorus has become a worldwide environmental problem. Adsorption active sites is less of traditional adsorbents in the phosphorus removal process resulting in low removal efficiency, so the new high-efficiency phosphorus removal adsorbents become an effective way to solve the problem. In this work, quercetin modified MnFe layered double hydrotalcite three-dimensional composites structures encapsulated by lanthanum (La(III)) nanoparticles (QLa@MnFe-LDH) were successfully prepared by a classical hydrothermal method. The results of the adsorption experiments show that La(III) nanosphere-encapsulated MnFe-LDH provides a more adequate binding site for phosphate adsorption. The adsorption performance of QLa@MnFe-LDH for phosphate was outstanding, the maximum adsorption capacity was 346.5 mg/g at 298.15 K, which was 300 % higher than that of MnFe-LDH. Moreover, QLa@MnFe-LDH retained its high adsorption capacity (>315.5 mg/g) over a wide range of pH (4.0 ∼ 7.0). The active sites of the reactions were predicted by Multiwfn and Visual Molecular Dynamics (VMD), and novel visualization studies of weak interactions were applied to theoretical studies. The modified MnFe-LDH encapsulated by La nanospheres has a strong adsorption capacity for phosphate adsorption. Therefore, the modified QLa@MnFe-LDH was expected to become an effective adsorption material for phosphorus removal.
由于大量磷的释放，严重的水体富营养化已成为一个全球性的环境问题。在磷去除过程中，传统吸附剂的吸附活性位点较少，导致去除效率低，因此新型高效磷去除吸附剂成为解决该问题的有效途径。在这项工作中，通过经典的水热法成功制备了槲皮素修饰的 MnFe 层状双氢氧化物三维复合材料结构，其被镧（La(III)）纳米颗粒（QLa@MnFe-LDH）包裹。吸附实验结果表明，La(III)纳米球包裹的 MnFe-LDH 为磷酸盐吸附提供了更充足的结合位点。QLa@MnFe-LDH 对磷酸盐的吸附性能优异，在 298.15 K 时的最大吸附容量为 346.5 mg/g，比 MnFe-LDH 高 300%。此外，QLa@MnFe-LDH 在较宽的 pH 范围内（4.0∼7.0）仍保持较高的吸附容量（>315.5 mg/g）。通过 Multiwfn 和 Visual Molecular Dynamics（VMD）预测反应的活性位点，并将弱相互作用的新可视化研究应用于理论研究。La 纳米球包裹的改性 MnFe-LDH 对磷酸盐吸附具有很强的吸附能力。因此，改性 QLa@MnFe-LDH 有望成为一种有效的除磷吸附材料。
