埃洛石管内负载纳米四氧化三铁复合材料对亚甲基蓝的吸附性能

Adsorption Performance to Methylene Blue by Nano-Fe_3O_4 Assembled in Lumen of Halloysite Nanotubes

以柠檬酸铁为铁源,采用真空浸渍法和高温热分解法,在天然埃洛石纳米管(Hal)内成功负载了Fe3O4纳米粒子复合材料(A-Hal/Fe3O4),验证产物对染料分子的吸附性能提升效果。通过X射线衍射仪、Fourier转换红外光谱、X射线光电子能谱仪、透射电子显微镜以及振动样品磁强计对A-Hal/Fe3O4复合磁性材料的组成、结构、形貌、磁性进行表征,通过紫外-可见光谱检测了A-Hal/Fe3O4复合材料吸附亚甲基蓝的性能。结果表明:Fe3O4纳米颗粒已成功负载在HNTs管内,但有少量的Fe3O4表面被氧化成磁赤铁矿(γ-Fe2O3),造成样品呈黄色;制备的A-Hal/Fe3O4复合磁性材料对5 mg/L的亚甲基蓝的吸附性能良好,30 min内的吸附脱色率为98.99%;回收后再次吸附,30 min内的吸附脱色率为94.14%;相比于埃洛石原矿,A-Hal/Fe3O4产物在30 min时的脱色率提升20%以上。同时,负载在埃洛石管内的Fe3O4纳米粒子的比饱和磁化强度(Ms)可以达到4.7(A·m2)/kg,通过外加磁场的吸引作用,成功将吸附了有机染料分子的复合材料从模拟废水中快速分离。

A-HNTs/Fe3O4 nanocomposite was prepared by vacuum impregnation and thermal decomposition method using iron citric as the a raw sourcematerial. The Fe3O4 nanoparticles were re loaded in lumen of the halloysite nanotubes （Hal）, and the product showed. The product shows the enhanced adsorption performance to dye molecules. The composition, structure, morphology and magnetic properties of the composite were characterized by X-ray diffraction, Fourier Transform transform infrared spectroscopy, X-ray photoelectron spectroscopy, Transmission transmission electron microscope microscopy and Vibrating vibrating Sample sample Magnetometer magnetometry, respectivelytechniques. The adsorption property was evaluated by ultraviolet-visible spectroscopy spectra. The results indicated that Fe3O4 nanoparticles were are successfully loaded within halloysite tubes, the outer surface of Fe3O4 may have beenparticles is oxidized to maghemite （γ-Fe2O3）, resulting in the yellow color in the sample. The prepared A-HNTs/Fe3O4 composite showed shows an effective adsorption to 5 mg/L methylene blue, and the decolorization rate was is 98.99% in 30 min. The rate also reachedis 94.14% when the composite was recovered andis reused for the second time. The decolorization rate to methylene blue by A-Hal/Fe3O4 showed is increased by an uplifting of more than〉 20% at 30 min, compared to that by the raw halloysite. The specific saturated magnetization （Ms） of A-HNTs/Fe3O4 nanocomposite is 4.7（A·m2）/kg, which facilitates the effective magnetic separation of the composites and the adsorbed organic dye molecules in a modulated waste water.