SiO2@Fe3O4磁性纳米复合材料的制备及其对亚甲基蓝吸附性能研究

Preparation of SiO2@Fe3O4 magnetic nanocomposites and their adsorption properties for methylene blue

利用正硅酸四乙酯作为SiO2的前驱体,制备了SiO2包覆铁氧体(SiO2@Fe3O4)磁性纳米复合材料。通过FT-IR、TEM、BET等表征方法,研究了不同搅拌速率、(TEOS)g/(MNPs)g、氨量及水解温度制备的SiO2@Fe3O4磁性纳米复合材料对废水中亚甲基蓝吸附性能的影响。结果表明,在搅拌速率为400 r/min,(TEOS)g/(MNPs)g为2.4,氨量为2.5mL,水解反应温度为40℃时,所制备的SiO2@Fe3O4磁性纳米复合材料对亚甲基蓝的吸附性能最佳。磁选和再生性能研究表明,所制备的SiO2@Fe3O4磁性纳米复合材料孔径大小合适、分布均匀,其磁选性能满足日常需要,且具有良好的再生性能和优异的亚甲基蓝吸附性能。

Tetraethyl orthosilicate was used as the precursor of SiO2 to prepare SiO2 coated ferrite(SiO2@Fe3O4)magnetic nanocomposites.The effects of stirring rate,(TEOS)g/(MNPs)g,ammonia content and hydrolysis temperature on the adsorption of methylene blue in wastewater were studied by FT-IR,TEM and BET characterization methods.The results showed that when the stirring rate was 400 r/min,(TEOS)g/(MNPs)gwas 2.4,the ammonia content was 2.5 mL,and the hydrolysis temperature was 40℃.The prepared SiO2@Fe3O4 magnetic nanocomposites had the best adsorption performance for methylene blue.The results of magnetic separation and regeneration showed that the pore size of SiO2@Fe3O4 magnetic nanocompositeswas suitable and uniformly distributed.The magnetic separation performance of SiO2@Fe3O4 magnetic nanocompositesmet the daily needs,and had good regeneration performance and excellent methylene blue adsorption performance.