School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510006, P. R. China.
Chem Asian J. 2023 Jun 1;18(11):e202300202. doi: 10.1002/asia.202300202. Epub 2023 May 2.
Eutrophication has posed a threat to aquatic ecosystems, so it's urgent to remove excessive phosphate from water. In this study, we developed an adsorbent material, cerium/terephthalic-acid metal-organic-frameworks (Ce-MOF), to remove phosphate from different water systems. The optimal Ce-MOF presented a maximum phosphate adsorption capacity of 377.2 mg/g, approximately 3.7 times higher than that of the commercial phosphate adsorbent (Phoslock: 101.6 mg/g). Experimental and computational analysis suggested that pH dominated the adsorption process. The main forces driving the adsorption process changed from the synergistic effect of electrostatic attraction and ligand exchange at lower pH to only ligand exchange at the increased pH values. Hence, the Ce-MOF is applicable for phosphate adsorption in a wide pH range. Impressively, the adsorbent remained an excellent phosphate adsorption performance in the real water containing various interfering ions and organic matters, indicating the potential of Ce-MOF for the practical use to solve the water eutrophication issue.
富营养化对水生生态系统构成了威胁，因此急需从水中去除过量的磷酸盐。在这项研究中，我们开发了一种吸附剂材料，铈/对苯二甲酸金属-有机骨架（Ce-MOF），用于从不同的水系统中去除磷酸盐。最佳的 Ce-MOF 呈现出 377.2mg/g 的最大磷酸盐吸附容量，大约是商业磷酸盐吸附剂（Phoslock：101.6mg/g）的 3.7 倍。实验和计算分析表明，pH 值主导了吸附过程。在较低的 pH 值下，吸附过程的主要驱动力是静电吸引和配体交换的协同作用，而在较高的 pH 值下，主要驱动力变为仅配体交换。因此，Ce-MOF 适用于在较宽的 pH 范围内进行磷酸盐吸附。令人印象深刻的是，该吸附剂在含有各种干扰离子和有机物的实际水样中仍保持着优异的磷酸盐吸附性能，表明 Ce-MOF 具有解决水体富营养化问题的实际应用潜力。
