Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China; Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, Yunnan University, Kunming, 650091, China; National Demonstration Center for Experimental Chemistry and Chemical Engineering Education, Yunnan University, Kunming, 650091, China.
Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China.
Chemosphere. 2021 Feb;264(Pt 2):128551. doi: 10.1016/j.chemosphere.2020.128551. Epub 2020 Oct 7.
In order to facilitate recovery and enhance phosphate adsorption capacity of lanthanum (La)-based materials, magnetic FeO@MgAl-LDH@La(OH) (MMAL) composites with a hierarchical core-shell structure were synthesized. In the preparation process, citric acid played a vital role in the morphology control of La(OH), deciding the La content and phosphate adsorption capacity of materials. MMAL composites with a citric acid-to-La molar ratio of 0.375 (MMAL-0.375) exhibited a high adsorption capacity of 66.5 mg P/g, fast adsorption kinetics of 30 min, widely applicable pH range of 4.0-10.0, outstanding selective adsorption performance, and superior reusability in batch adsorption experiments. Moreover, the phosphate in the desorption solution could be concentrated by repeated use of desorption solution and recovered by using CaCl. When the obtained composites were used for the sedimentary phosphorus sequestration and recovery, the results showed that the addition of MMAL-0.375 effectively reduced the concentration of soluble reactive phosphorus (SRP) in the overlying water. Accompanied by an evident increase in HCl-extractable phosphorus (HCl-P), mobile phosphorus (P) in sediments was effectively reduced. This work indicates that the MMAL-0.375 composites can serve as an effective tool for the removal of phosphate from wastewater and the control of sedimentary phosphorus.
为了促进恢复并增强基于镧的材料的磷酸盐吸附能力，合成了具有分级核壳结构的磁性 FeO@MgAl-LDH@La(OH)（MMAL）复合材料。在制备过程中，柠檬酸在控制 La(OH)的形态方面起着至关重要的作用，决定了材料的 La 含量和磷酸盐吸附能力。柠檬酸与 La 的摩尔比为 0.375（MMAL-0.375）的 MMAL 复合材料具有 66.5 mg P/g 的高吸附容量、30 min 的快速吸附动力学、4.0-10.0 的广泛适用 pH 范围、出色的选择性吸附性能以及在批量吸附实验中的出色可重复使用性。此外，通过重复使用解吸溶液，可以浓缩解吸溶液中的磷酸盐，并使用 CaCl 进行回收。当将获得的复合材料用于沉积物磷的固定和回收时，结果表明，添加 MMAL-0.375 可有效降低上覆水中可溶活性磷（SRP）的浓度。伴随着 HCl 可提取磷（HCl-P）的明显增加，沉积物中的移动磷（P）被有效降低。这项工作表明，MMAL-0.375 复合材料可以作为从废水中去除磷酸盐和控制沉积物磷的有效工具。
