Efficient adsorption of La(Ⅲ)by functionalized mesoporous molecular sieve MS-PC20 modified with nano-Fe3O4
A mesoporous silica of MS-PC20 was prepared from sodium silicate and fluorosilicic acid using the non-ionic surfactant polyoxyethylene cetyl ether(PC20)via the gel method.MS-PC20 was modified by(E)-2-[(hydroxymethyl)iminomethyl]-5-methoxyphenol(HESI)selective ligand,and then a magnetic component(Fe3O4)was added to the modified material,and MS-PC20-HESI and MS-PC20-HESI-Fe3O4-NPs were successfully prepared.They were utilized as a novel adsorbent for the adsorption of La(Ⅲ)ions in water samples.The chemical structure,morphology,and crystal structure of the composites were characterized by Fourier infrared spectroscopy,scanning electron microscopy,and X-ray diffraction,respectively.The effects of MS-PC20-HESI-Fe3O4-NPs adsorbent on the La(Ⅲ)adsorption performance under different conditions were investigated by examining and optimizing important variables such as sample solution pH,initial concentration of La(Ⅲ)ions,and adsorption time.The results showed that the La(Ⅲ)adsorption onto MS-PC20-HESI-Fe3O4-NPs composite was 165.68 mg·g-1 under the optimized conditions with a high adsorption rate of 88.34％,and the process of adsorption conformed to the pseudo-second-order and Langmuir models.MS-PC20-HESI-Fe3O4-NPs composite not only has fast adsorption rate,but also has enough accessibility,high adsorption capacity and good reusability to the target species.And the incorporation of a magnetic component allowed for convenient and economical magnetic separation under external magnetic field.
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