Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong, China.
Chemosphere. 2020 Dec;261:128118. doi: 10.1016/j.chemosphere.2020.128118. Epub 2020 Aug 29.
Lanthanum based nanocomposites have attracted much attention for their efficiency and capacity in removing phosphate from water. This study developed a FeO/La(OH) nanocomposite through a precipitation route at room temperature and used the nanocomposite to remove phosphate from river water. Performance of the FeO/La(OH) nanocomposite was evaluated in terms of sorption kinetics, sorption isotherms, different solution pH values, competing ions, and regenerative ability. The FeO/La(OH) nanocomposite showed a nanosphere-like morphology with 97% magnetic separation efficiency, excellent phosphate removal capacity of 253.83 mg/g, 99% phosphate selectivity in the presence of chloride, nitrate, sulfate, fluoride, and calcium as competing ions and excellent reusability in ten cycles. Based on these findings, the FeO/La(OH) nanocomposite was used to remove phosphate from river water. It was found that, in 60 min, a 0.1 g/L dosage of the nanocomposite was able to reduce the phosphate in the water from 0.087 mg/L to 0.002 mg/L. Moreover, studying of the removal mechanism of the nanocomposite revealed that surface complexation and the electrostatic interaction between phosphate species and lanthanum hydroxide played a prominent role in the sorption of phosphate.
镧基纳米复合材料因其在从水中去除磷酸盐方面的高效性和容量而受到广泛关注。本研究通过室温沉淀法制备了 FeO/La(OH)纳米复合材料，并将其用于从河水中去除磷酸盐。通过吸附动力学、吸附等温线、不同溶液 pH 值、竞争离子和再生能力评估了 FeO/La(OH)纳米复合材料的性能。FeO/La(OH)纳米复合材料具有纳米球形态，磁分离效率达到 97%，在氯化物、硝酸盐、硫酸盐、氟化物和钙等竞争离子存在下具有 253.83 mg/g 的优异磷酸盐去除能力和 99%的磷酸盐选择性，在十次循环中具有良好的可重复使用性。基于这些发现，将 FeO/La(OH)纳米复合材料用于去除河水中的磷酸盐。结果表明，在 60 分钟内，0.1g/L 剂量的纳米复合材料能够将水中的磷酸盐从 0.087mg/L 降低至 0.002mg/L。此外，对纳米复合材料去除机制的研究表明，表面络合和磷酸盐物种与氢氧化镧之间的静电相互作用在磷酸盐的吸附中起着重要作用。
