Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian, 361021, People's Republic of China.
Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
Environ Sci Pollut Res Int. 2023 Nov;30(51):110901-110912. doi: 10.1007/s11356-023-29960-1. Epub 2023 Oct 5.
Excessive phosphorus in water would cause eutrophication and deterioration of the ecological environment. Herein, the La-MOFs/AlO composite was successfully prepared by the in situ hydrothermal synthesis method for granulation, which was conducive to exerting the phosphate adsorption capacity and facilitating practical application. The materials were characterized by SEM, EDX, XRD, BET, FTIR, and Zeta. In addition, the adsorption performance of La-MOFs/AlO was evaluated through adsorption kinetics and isotherms, showing that the Langmuir adsorption capacity was 16.34 mgP·g (25 °C) and increased with the water temperature. Moreover, the batch influence experiments of intimal pH, adsorbent dosage, coexisting ions, and stability tests were performed to analyze the potential for practical applications and verified through the natural micro-polluted water samples from Houxi River and Bailu Lake (China). The results indicated that the La-MOFs/AlO was suited to a wide pH range of 4 to 10 and the phosphate removal efficiency remained above 70% after continuous use for four times, exhibiting excellent stability. It also had excellent selectivity in the presence of SO, Cl, NO, and HCO, only decreased to 70.24% at high HCO ion concentration of 60 mg/L, respectively. And the La-MOFs/AlO had excellent adsorption of total phosphorus, phosphate, and organic phosphorus in the actual river and lake water and completely removed dissolved phosphorus. Finally, a phosphate adsorption mechanism model involved in electrostatic interaction and ligand exchange was proposed. Therefore, La-MOFs/AlO could be considered to be an excellent phosphorus adsorbent for application in the actual water environmental remediation.
水中过量的磷会导致富营养化和生态环境恶化。在此，通过原位水热合成方法成功制备了 La-MOFs/AlO 复合材料进行造粒，有利于发挥其磷酸盐吸附能力，便于实际应用。通过 SEM、EDX、XRD、BET、FTIR 和 Zeta 对材料进行了表征。此外，通过吸附动力学和等温线评估了 La-MOFs/AlO 的吸附性能，结果表明 Langmuir 吸附容量为 16.34 mgP·g（25°C），并随水温升高而增加。此外，还进行了内膜 pH、吸附剂用量、共存离子和稳定性测试的批量影响实验，以分析实际应用的潜力，并通过侯西河和白鹭湖（中国）的天然微污染水样本进行了验证。结果表明，La-MOFs/AlO 适合 pH 值范围为 4 至 10，连续使用四次后，磷去除效率仍保持在 70%以上，表现出优异的稳定性。在存在 SO、Cl、NO 和 HCO 的情况下也具有优异的选择性，HCO 离子浓度为 60mg/L 时，仅降低至 70.24%。La-MOFs/AlO 对实际河湖水总磷、磷酸盐和有机磷具有良好的吸附作用，可完全去除溶解磷。最后，提出了涉及静电相互作用和配体交换的磷酸盐吸附机制模型。因此，La-MOFs/AlO 可被视为应用于实际水环境修复的优秀磷吸附剂。
