高孔隙率磁性镧吸附剂的磷吸附性能研究

Phosphorus Adsorption Performance of High Porosity Magnetic Lanthanum Adsorbents

以磁性粉煤灰颗粒(MSP)为磁核,通过水热法制备了MSP@La2O3磁性磷吸附剂。系统的结构表征显示,所得样品粒径介于0.2~5 μm之间,多孔的六方相La2O3包覆在MSP颗粒表面,包覆层的孔隙结构与水热反应的pH值密切相关,在pH = 9条件下制备的MSP@La2O3比表面积可达122.17 cm3/g。磷吸附试验表明,MSP@La2O3的磷吸附量与吸附剂结构、吸附剂添加量及含磷废水的pH值等因素有关,最高比吸附量可达26.39 mg/g。VSM表征显示,MSP@La2O3磁性磷吸附剂的比磁化强度可达24.37 emu/g,通过外磁场可实现高效固液分离,经过适当处理可多次循环利用。

Using magnetic coal fly ash particles (MSP) as magnetic core, MSP@La2O3 magnetic phosphorus adsorbent system was prepared by hydrothermal method. Careful structure characterizations show that the obtained samples are 0.2~5 μm in size. Porous hexagonal La2O3 completely coats on the surface of MSP particles, and the morphology and pore structure of the coating layer is closely related to the pH value of the hydrothermal reaction. The specific surface area of MSP@La2O3 synthesized at pH = 9 is the highest, reaching 122.17 cm3/g. Phosphorus adsorption experiments show that the P adsorption of MSP@La2O3 is related to the structure and addition amount of adsorbent, the concentration of phosphorus, and pH value of the water. The highest specific adsorption capacity can reach 26.39 mg/g. The magnetism of the MSP@La2O3 magnetic phosphorus adsorbent is tested as 24.37 emu/g by VSM. Thus, it can be separated effectively from solution by using an external magnetic field. The MSP@La2O3 magnetic phosphorus adsorbent can be recycled several times after proper treatment.