High efficiency and environmental protection: Preparation of layered magnesium hydroxide and its innovative adsorption of rare earth europium ions
This study mainly explores an efficient method for preparing layered magnesium hydroxide (LHM), and conducts in-depth research on the adsorption performance of the obtained LHM material for rare earth element europium ions (Eu³⁺), aiming to provide solutions for the removal of heavy metal ions and resource recovery. Provide a new, efficient and environmentally friendly material. By controlling the synthesis conditions, the layered structure of LHM was optimized, and then its adsorption capacity, kinetics, equilibrium adsorption capacity and adsorption mechanism for Eu³⁺ were investigated.
1. Introduction Due to its unique layered structure, large specific surface area and good chemical stability, layered magnesium hydroxide has shown broad application prospects in wastewater treatment, drug sustained release, catalyst carriers, etc. in recent years. In particular, its adsorption performance for heavy metal ions has attracted widespread attention from scientific researchers. Among them, rare earth elements play an important role in high-tech industries due to their unique photoelectric and electromagnetic properties, but at the same time, the environmental pollution caused by their mining and use cannot be ignored. Therefore, it is of great significance to develop efficient and environmentally friendly rare earth ion adsorption materials.
2. Materials and methods 2.1 Preparation of layered magnesium hydroxide. Layered magnesium hydroxide was synthesized by co-precipitation method. By adjusting factors such as reactant concentration, pH value, reaction temperature, etc., the synthesis conditions were optimized to obtain highly ordered layered magnesium hydroxide. Structural LHM. The morphology and structure of the prepared LHM were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM).
2.2 Study on the adsorption performance of Eu³⁺. The synthesized LHM was used in the adsorption experiment of Eu³⁺ solution. By changing the initial concentration, pH value, contact time and other conditions of the solution, the adsorption kinetics, isothermal adsorption model and maximum adsorption capacity of Eu³⁺ were studied. . Ultraviolet-visible spectroscopy (UV-Vis) and Fourier transform infrared spectroscopy (FTIR) were used to analyze the changes in the material before and after adsorption and explore the adsorption mechanism.
3. Results and Discussion The experimental results show that the LHM obtained by optimizing the synthesis conditions has a good layered structure and a high specific surface area, which is extremely beneficial to the adsorption of Eu³⁺. Adsorption experiments show that LHM adsorbs Eu³⁺ quickly and efficiently, and the equilibrium adsorption capacity can reach xxx mg/g, indicating that it has good adsorption performance. Kinetic studies showed that the adsorption process conformed to a pseudo-second-order kinetic model, indicating that adsorption was mainly controlled by chemical adsorption. Isothermal adsorption data analysis is consistent with the Langmuir model, further confirming the characteristics of single-layer adsorption. FTIR analysis revealed that the coordination interaction between the hydroxyl groups on the surface of LHM and Eu³⁺ is the main mechanism of adsorption.
4. Conclusion This study successfully prepared magnesium hydroxide with an obvious layered structure, and proved its efficient adsorption capacity for Eu³⁺ through systematic research. As an adsorbent, LHM not only has strong adsorption capacity, but is also environmentally friendly, providing a feasible solution to the environmental pollution problem of rare earth elements. Future research will further explore its application potential in actual wastewater treatment and the possibility of regeneration and recycling.